US3644723A

US3644723A - Circular interpolation system

Info

Publication number: US3644723A
Application number: US854013A
Authority: US
Inventors: Harvey J Rosener
Original assignee: Allen Bradley Co LLC
Current assignee: Allen Bradley Co LLC
Priority date: 1964-02-03
Filing date: 1969-08-05
Publication date: 1972-02-22
Anticipated expiration: 1989-02-22
Also published as: US3506812A

Abstract

An operational integrator comprising an integrand register and an accumulator register, a pulse code unit for supplying four series of pulses and a carry pulse to transfer the numbers stored in respective integrand decades to respective associated accumulator decades in parallel, with provision for carry between successive accumulator decades in response to the carry pulse. The number in the integrand register can be selectively changed in a positive or negative direction to provide for circular interpolation, for example.

Description

United States Patent Rosener 5] Feb.22,1972

[54] CIRCULAR INTERPOLATION SYSTEM [72] Inventor: Harvey J. Rosener, Dayton, Ohio [7 3] Assignee: Allen-Bradley Company, Milwaukee, Wis.

[22] Filed: Aug. 5, 1969 [21] Appl. No.: 854,013

Related (1.8. Application Data [62] Division of Ser. No. 341,958, Feb. 3, 1964, Pat. No.

[52] U.S.Cl ..235/l56,235/152,235/l50.3l, 235/92 NT [51] Int. Cl ..G06f 7/38, G06f 15/34, G06 H02 {58] Field ofSearch ..235/152, 150.31, 156, 92 NT [56] References Cited UNITED STATES PATENTS 2,995,302 8/1961 lngwerson et a1 ..235/150.31 3,254,203 5/1966 Kveim ..235/ 152 OTHER PUBLICATIONS Mathematical Tables and Other Aide to Computation, Jan. 1952, National Research Council, Vol. 5, No. 33, Pgs. 45- 47. R. K. Richards, Arithmetic Operations in Digital Computers, D. VanNostrand Co., 1955, Richards lpgs. 177- I82, Richards II- pgs. 230 237, Richards 111- pgs. 202- 203.

Primary Examiner-Eugene G. Botz Assistant Examiner.lames F. Gottman Attorney-Arnold T. Ericsen and Richard C. Steinmetz, Jr.

[57] ABSTRACT An operational integrator comprising an integrand register and an accumulator register, a pulse code unit for supplying four series of pulses and a carry pulse to transfer the numbers stored in respective integrand decades to respective associated accumulator decades in parallel, with provision for carry between successive accumulator decades in response to the carry pulse. The number in the integrand register can be selectively changed in a positive or negative direction to provide for circular interpolation, for example.

10 Claims, 4 Drawing Figures PAIENTEUFEB 22 1912

sum

1 or 3 mm mm mm Nww ROY IN VFZNTOR.

CIRCULAR INTERPOLATION SYSTEM CROSS-REFERENCE TO RELATED APPLICATION This application is a division of my pending application Ser. No. 341,958 filed Feb. 3, 1964, now U.S. Pat. No. 3,506,812 issued Apr. 14, 1970.

The disclosure of said U.S. Pat. No. 3,506,812 is incorporated herein by reference.

SUMMARY OF THE INVENTION A pair of operational integrators are provided each including an integrand register and an accumulatorregister, each including a plurality of serially connected units with parallel connections between units of the accumulator register and units of the integrand register. Means are provided for simultaneously operating all of the accumulator register units through an addition cycle to cause each unit to add a number stored therein at the beginning of a cycle to a number supplied in parallel from the associated integrand register unit, and also to cause transmission of pulses serially from each accumulator register unit to a succeeding unit. With this arrangement, the addition operation can be carried out at a high rate of speed. In addition, information can be readily applied initially to the integrand registers, which are preferably decade units, and most preferably are units having four flip-flops each, to which information may be applied using a 5, 2, l, 1 code.

According to a specific feature of the invention, each accumulator register unit comprises a decade having an input connected to four gates which are selectively enabled from signals applied directly from an associated integrand register unit, and such gates are connected to a pulse code unit which operates through a cycle of operation to apply four series of pulses in each cycle of operation with the number of pulses in the four series being selectively addable to produce any number from one through nine. Preferably, the 5, 2, l, l code is used, five pulses being applied in each cycle to one gate, two pulses to a second gate, and one pulse each to the other two gates, the pulses being noncoincident. In addition, a'storage means in the form of a flip-flop is provided for storing a carry pulse from the decade, and the stored carry pulse is controllably released by a carry pulse from the pulse code unit, the carry pulse from the pulse code unit being noncoincident with other pulses produced thereby.

With this arrangement, an addition operation may be performed with application of only input pulses to the pulse code unit. In addition, the information applied in parallel from the integrand units may be modifiedduring the carry time of the pulse code unit, so as not to interfere with the addition operation. Additional advantages are that the input can be stopped at any time without loss of information in the integrand and accumulator registers, and a variable-frequency input may be used, to obtain any desired feed rate.

Additionally, pulses may be supplied to output lines from different units of the accumulator register, as desired, and pulses may also be feed back from such units to the first or other units of the integrand register, and various different modes of both linear and circular interpolation operation may be obtained. In addition, the system can be readily used in variable lead thread cutting operation.

Another important feature of the invention is in the construction of the integrand unit to which information can be readily applied initially in parallel, and which can thereafter be modified serially in an up-counting or down-counting operation as required to generate the proper output signals.

BRIEF DESCRIPTION OF FIGS. 3-5 AND 7 FIG. 3 is a block diagram of operational integrators and end point storage registers of the system of FIG. 1 of parent U.S. Pat. No. 3,506,812 incorporated herein by reference;

FIG. 4 is a block diagram of one of five dual channel accumulator register units of the operational integrators of FIG. 3;

FIG. 5 is a graph showing the timed relationship of pulses produced by a pulse code unit of the integrators of FIG. 3; and

FIG. 7 is a block diagram of one of l0integrand register units of the system.

DETAILED DESCRIPTION OF FIGS. 3-5 AND 7 OPERATIONAL INTEGRATORS 41 AND 42 Referring to FIG. 3, the operational integrators 41 and 42 are in the form of digital differential analyzers each including accumulator and integrand registers. The accumulator registersinclude five dual-channel units 71-75 each of which contains circuits of both the operationalintegrator 41 and the operation integrator 42. The units 71-75 are supplied with signals from a pulse code unit 76, operative in a manner as described below. I

Five integrand register units 81-85 form the integrand re- 1 gister of the integrator 41, while five integrand register units 86-90 form the integrand register of theintegrator 42. As also shown in FIG. 3, the'end point storage unit 63 comprises five register units 91-95 while the end point storage circuit 64 comprises five register units 96-100.

In-both linear and circular interpolation, an x number or word is entered into theend point register units 9I-95, the least significant digit being entered in the unit 95. Similarly, a y is entered into the register units 96-100.

In linear interpolation, such 1: and y numbers are also entered into the integrand units 81-85 and the integrand units 86-90, through lines 101-105 and 106-110. The xvand y numbers so stored in the integrand units 81-85 and 86-90 are cyclically added through the operation of the dual channel accumulator register units 71-75, and output pulses are developed on lines 45 and 46, connected to the final unit 75, at rates proportional to the numbers stored in the integrand units 81-85 and 86-90. Output pulses are also developed on

lines

47 and 48 at rates which are one-tenth the rates at which they are developed on the lines 45 and 46.

In normal linear interpolation, the lines 45 and 46 are connected through the switching and control circuit 431to the output lines 25 and 26, respectively, and the servosystems 27 and 28 move the machine parts 21 and 22 in proportion-thereto.

As an example of such linear interpolation operation, assume that it is desired to move a cutter relative to a workpiece along thelinear path 30 from the point 31 to' the point 32 as illustrated in FIG. 2 (as shown in U.S. Pat. No. 3,506,812). The numbers 30,000 and 40,000 would be entered into the integrand units 81-85 and 86-90 and in a given interval of time,

30,000 and 40,000 pulses would be developed on the lines 45 and 46, connected to the lines 25 and 26, respectively. After development of such pulses, the integrators 41 and 42 would be stopped in response to signals from the end point storage circuits 63 and 64, assuming normal linear interpolation operation. In long dimension linear interpolation 10 times as many pulses would be developed before stopping, as explained below, whereby 10 times as many pulses would be developed with the same numbers entered into the units.

In circular interpolation, x and y numbers or words are entered into the end point register units 91-95 and 96-100, while i and j words are entered into the integrand units 81-85 and 86-90, as above indicated. In such circular interpolation operation, however, the connections are reversed in the signal switching and combining circuit 43 such that in normal circular interpolation operation, the lines 45 and 46 or the

lines

47 and 48 are connected to the lines 26 and 25, respectively, and the initial rate of generation of pulses on the line 25 is determined by the number entered into the j integrand 86-90 while the initial rate of generation of pulses on the line 26 isdetermined by the number entered into the i integrator units 81-85. In circular interpolation, feedback connections'are provided in the feedback switching unit v55, such that the numbers stored in the integrand units 81-85 and 86-90 are changed in response to output pulses, in a manner such as to vary the rates of generation of the pulses, and to cause relative movements of the parts in a circular path, rather than a linear path.

ACCUMULATOR REGISTER UNITS 71-75 FIG. 4 illustrates the circuit of the final dual channel accumulator register unit 75, the circuits of the other four register units 71-74 being identical thereto. In general, each register unit has an operating cycle in which it adds a number initially stored therein to a number stored in a corresponding integrand unit, and to supply the results of such addition to a subsequent unit or other circuit.

The register unit 75 comprises a divide-by-lO register or decade counter for each channel, including four flip-flops 111-1 14 for the i channel and four flip-flops 115-1 18 for thej channel. The inputs of the first flip-flops 111 and 115 are connected to the outputs of monostable multivibrators 119 and 120 each of which has five input terminals, connected to an OR-gate in the input circuit of the multivibrator. One input of the multivibrator 119 is connected to the output of an OR- gate 121, and the other four inputs are connected to the outputs of AND-gates 122-125.

Similarly, the inputs of the multivibrator 120 are connected to the outputs of an OR-gate 126 and four AND-gates 127-130. The OR-gate 121 has one input connected to an input terminal 131 and to additional inputs which are not used in the illustrated system, but are provided as auxiliaries. The input terminal 131 is connected to an output from a preceding decade to receive carry pulses in a manner to be described. The AND-gates 122-125 have inputs connected through lines 132-135 to outputs from the corresponding i integrand unit, in this case the unit 85. Similarly, the OR-gate 126 has an input connected to an input terminal 136 and the AND-gates 127-130 have inputs connected through lines 137-140 to the correspondingj integrand unit, in this case the unit 90.

Four emitter followers 141-144 are provided having inputs connected to input terminals 145-148 and having output terminals connected to inputs of the gates 122-125 and also to inputs of the gates 127-130. In addition, inputs of all four gates 122-125 are connected to a terminal 149, while inputs of all four gates 127-130 are connected to an input terminal 150. Enabling signals are applied to the

terminals

149 and 150, to render the units operative.

The input terminals 145-148 and also an input terminal 151 are connected to outputs of the pulse code unit, which is a decade unit ofa type known in the art, operative to supply pulses with a 5, 2, l, 1 code, in response to supply of input pulses thereto. The timed relation of such pulses is shown in FIG. 5. In response to a cycle of operation wherein l input pulses are applied to the pulse code unit, five pulses are developed at a first output which is connected to the terminal 145, and to like terminals of the other units. That output is designated as the output and it will be noted that the five pulses are developed coincident with the first, third, fifth, seventh and ninth input pulses of a cycle. A (2) output, connected to terminal 146, develops two pulses coincident with the second and sixth pulses of each cycle, a (1) output, connected to terminal 147, developes one output pulse coincident with the fourth input pulse of each cycle, and a (1) output, connected to the terminal 148, also develops one output pulse coincident with the eighth pulse of each cycle. In addition, the unit 76 developes a carry output pulse, coincident with the th or final pulse of each cycle, such being applied to the terminal 151.

In operation, the decade counter which includes the flipflops 111-114 is advanced in count in response to each series of 10 input pulses to the pulse code unit, according to which of the gates 122-125 is enabled from signals applied from the corresponding integrand unit. By way of example, if the flipflops 111-114 are initially in a zero-count condition and if enabling signals are applied to the (5) and (2) input lines 132 and 133, the decade counter formed by the flip-flops will be advanced to a count of seven in response to a cycle of operation wherein 10 pulses are applied from the pulse code unit 76. With enabling signals applied to the (2) input 133, the (1) input 134 and the (1) input in the next cycle the decade counter would be advanced by a count of four in response to the series of 10 input pulses of the next cycle. It would, however, reset at the count of 10 so that in this example, the counter would register one after two cycles with a total of 20 input pulses.

Accordingly, an addition operation is performed by each accumulator register unit during each cycle wherein 10 input pulses are applied to the pulse code unit 76, the number stored in the corresponding integrand unit during one cycle being added to the number stored in the accumulator register unit during the preceding cycle.

With respect to the operation of the decade counters in the accumulator register units, reset outputs of the flip-flops 111-113 and 115-117 are respectively connected to binary inputs offiip-flops 112-114 and 1 16-118. Reset outputs of the flip-

flops

114 and 118 are connected to inputs of monostable multivibrators 161 and 162 having

output terminals

163 and 164 at which output signals are developed immediately upon triggering of the multivibrators and having

additional output terminals

165 and 166 at which output signals are developed after a certain delay, preferably on the order of 2 microseconds.

Output terminals

163 and 164 are connected through emitter-

followers

167 and 168 to

output terminals

169 and 170. Output terminals 165 are connected through emitter-followers 171 and 172 to inputs of flip-

flops

112, 113 and 116, 117.

Such output terminals

165 and 166 are additionally connected to inputs of a pair of carry pulse storage flip-flops 173 and 174 having reset inputs connected to the terminal 151 and having set outputs connected to the inputs of negative input pulsers 175 and 176, the outputs of which are connected to output terminals 177 and 178.

In operation of the i decade including flip-flops 111-114 (which is the same as that of thej decade), the flip-flops 111 and 114 may be assumed to be initially in the reset condition, while flip-flops 112 and 113 may be assumed to be in a set condition. The first pulse applied from the multivibrator 119 sets the flip-flop 11 1. The second pulse resets the flip-flop 111 which resets the flip-flop 112, which resets the flip-flop 113, which sets the flip-flop 114. The third pulse sets the flip-flop 111. The fourth pulse resets the flip-flop 111 and sets the flipflop 112. The fifth pulse sets the flip-flop 111. The sixth pulse resets the flip-flop 111 which resets the flip-flop 112, which sets the flip-flop 113. The seventh pulse sets the flip-flop 111. The eighth pulse resets the flip-flop 111 which sets the flipflop 112. The ninth pulse sets the flip-flop 111. The tenth pulse resets the flip-flop 111, which resets the flip-flop 112, which resets the flip-flop 113, which resets the flip-flop 114. When the flip-flop 114 is reset, the monostable multivibrator 161 is operated and after a certain delay, on the order of 2 microseconds, a signal is developed at the output terminal 165 which is applied through the emitter follower 171 to the set inputs of flip-flops 112 and 113 to place the same in a set condition. The counter is then in its initial condition with the flipflops 111 and 114 being reset and with the flip-flops 112 and 1 13 being set.

When the delayed signal is developed at the output terminals 165 of the delay multivibrator 161, the carry pulse storage flip-flop 173 is placed in a set condition. Thereafter, when the next carry pulse is applied from the pulse code unit, the flip-flop 173 is reset, and the negative input pulser 175 develops an output signal at the terminal 177.

The output signal at the terminal 17 7 is referred to herein as a normal controlled carry signal or NC" signal and it is applied to the input terminal 131 of the next succeeding accumulator register unit. In the case of the final unit 75, the terminal 177 and also the terminal 178 are not connected to a succeeding accumulator unit, but may be connected to an integrand unit through the feedback switching circuit 65 in a manner to be described. However, the

input terminals

131 and 136 of the final unit 75 are connected to the normal controlled carry output terminals 177 and 178 of the preceding accumulator register unit 75.

It is important to note that the controlled carry signal is generated in synchronism with the carry signal from the pulse code unit and therefore it is not in time coincidence with other output signals from the pulse code unit 176. Accordingly, the signals applied to the multivibrators 119 and 120 from the

terminals

131 and 136 are not coincident with, and do not interfere with, the signals applied thereto from gates 122-125 and 127-130. Also, as will be clarified hereinafter, feedback switching signals applied from the controlled carry output terminals 177 and 178 to

integrand units

86 and 81 or 87 and 82 cause operation of the integrand units and change the signals which may be applied on lines 132-135 and 137-140, at a time which is not coincident with code pulses applied from the pulse code unit 76 to input terminals 145-148.

The

output terminals

169 and 170 are referred to herein as normal or N outputs. An addition pair of

output terminals

181 and 182 are provided, designated as Ten Normal or N terminals. Pulses are developed at such terminals at a rate equal to 10 times the rate of generation of pulses at the

N terminals

169 and 170. In particular,

terminals

181 and 182 are connected to the outputs of the monostable multivibrators 119 and 120. Thus, the input pulses to the decade counters are applied through the emitter-

followers

183 and 184 to the

output terminals

181 and 182.

Accordingly, each of the accumulator register units performs an addition operation during each cycle of operation of the pulse code unit 76, the number stored in the corresponding integrand units being added to the numbers stored in the two channels of the accumulator register unit during the preceding cycle. Three pairs of outputs are developed by each accumulator register unit. First, the Normal" output pulses are developed at the

N output terminals

169 and 170, developed upon resetting of the decade counters of the unit. Secondly, each unit develops Normal Controlled pulses at the NC output terminals 177 and 178, equivalent to the Normal pulses stored in the flip-flops 173 and 174, and generated in synchronism with the carry pulse from the pulse code unit 76. Thirdly, each unit develops the Ten Normal" pulses at the 10

N terminals

181 and 182.

As above indicated, the NC output terminals 177 and 178 of each unit are connected to the

input terminals

131 and 136 of the succeeding unit. The NC output terminals 177 and 178 of the final unit, also the

N output terminals

169 and 170 and the 10

N output terminals

181 and 182 of the final unit 75, and in some cases those terminals of the fourth unit 74, are connected in various modes of operation, as will be clarified hereinafter. First, however, the construction and operation of the integrand register units, and also the end storage register units, will be described.

INTEGRAND REGISTER UNITS FIG. 7 illustrates the circuit of the integrand register unit 81, the circuits of the other units 82-90 being substantially identical thereto. In general the integrand register units operate to selectively energize the 5, 2, l, 1 code lines 132-135 (or 137-140) to the accumulator register units, in accordance with stored information which can be serially increased or decreased.

Illustrated unit 81 is similar to the end point storage unit 91 of FIG. 6 of parent US. Pat. No. 3,506,812, and comprises an intermediate or buffer storage section including four flip-flops 257-260 and a final or active storage section including four flip-flops 261-264. The intermediate storage section operates in substantially the same manner as that of the end point unit, and the final storage section also operates in generally the same manner, in storing information according to the 5, 2, l, 1 code, and having a storage which may be serially diminished in response to application of input pulses. However, the integrand register unit additionally incorporates circuitry for selectively increasing rather than decreasing the stored information in response to input pulses.

In particular, five plus" gates 266-270 and five minus" gates 271-275 are provided, inputs of such plus and minus gates being respectively connected to outputs of emitter-

followers

277 and 278 having inputs connected to

terminals

279 and 280.

With a signal applied to the plus terminal 279, the gates 266-270 are enabled, and application of input pulses to an input terminal 281 causes the stored number to be increased by a count of one in response to each pulse. Similarly, with the signal applied to the minus terminal 280, the

gates

271 and 275 are enabled and application of each pulse to the terminal 281 reduces the stored number by a count of one.

The diminishing or subtraction operation performed with the gates 271-275 enabled, is substantially the same as that of the end point storage unit of FIG. 6, as above described. To accommodate the addition operation with the gates 266-270 enabled, additional circuitry is provided including a plurality of negative input pulsers which permit the change between plus and minus operation without destroying the stored information.

The flip-flops 261-264 are respectively (1), (l'), (2) and (5) storage elements, operating in this respect in the same way as the flip-flops 191-194 of the end point storage units. For the addition operation, it may be assumed that flip-flops 261-264 are initially in a reset condition, so that a zero is stored, and also a high signal is applied to the plus terminal 279 to enable the gates 266-270.

A first input pulse applied to terminal 281 passes through the gate 266, an OR-gate 283 and an emitter-follower 284 to an input of a gate 285 which, however, is blocked through the connection of another input thereof through an inverter 286 to the reset output of the flip-flop 261', and it is also blocked by the connection of another input thereof through an inverter 287 to the reset output of the flip-flop 263. The first input pulse is, however, applied to the input of a monostable multivibrator 289 having an output connected to the input of a negative input pulser 290 which develops an output pulse delayed with respect to the input pulse, by a certain time interval which is preferably on the order of 3 microseconds. The first delayed pulse passes through the gate 267 through an OR- gate 291, an emitter-follower 292 and an AnD-gate 293 to the binary input of the flip-flop 261 which is then switched from its reset condition to a set condition. Gate 293 is enabled by connection of a second input through an inverter 294 to the set output of flip-flop 262. A count of one is then stored.

The second input pulse from terminal 281 passes through gate 266, gate 283 and emitter-follower 284 to the gate 285 which, however, is'still blocked by the connection of an input thereof through the inverter 287 to the reset output of the flipflop 263. The second delayed pulse at the output of the negative input pulser 290 passes through the gate 267, the OR-gate 291, the emitter-follower 292 and the AND-gate 293 to the binary input of flip-flop 261 to reset the flip-flop 261. When flipflop 261 is reset, an output pulse is developed at the output of a negative inp ut pulser 295 connected to the output of the inverter 286, and the pulse so developed is applied through the gate 268 and through an OR-gate 296 to the binary input of the flip-flop 263 to place the flip-flop 263 in a set condition. A count of two is then stored.

The third input pulse passes through gate 266, gate 283 and emitter-follower 284 but is blocked at gate 285 through the connection of an input thereof through an inverter 286 to the reset output of the flip-flop 261. The third delayed pulse at the output of the negative input pulser 290 passes through gate 267, gate 291, emitter-follower 292 and the gate 293 to set the flip-flop 261. It is noted that this action enables gate 285 but without any immediate effect, because of the delay obtained from the multivibrator 289 and the negative input pulser 290. At this point, a count of three is stored.

A fourth input pulse passes through gate 266, gate 283, emitter-follower 284 and the gate 285 to set the flip-flop 262 through its binary input. The fourth delayed pulse at the output of pulser 292 is the gate 293 but is blocked by the connection of an input of the gate 293 through the inverter 294 to the set output of the flip-flop 262. A count offour is then stored.

The fifth input pulse passes through gate 266, gate 283, emitter-follower 284 and gate 285 to reset flip-flop 262. The fifth delayed pulse passes through gate 267, gate 291, emitterfollower 292 and gate 293 to reset flip-flop 261. An output pulse is then developed by the negative input pulser 295 which passes through gate 268 and gate 296 to reset the flip-flop 263. When flip-flop 262 is reset in response to the fifth input pulse as above described, a signal is developed at the output of a negative input pulser 298, connected through an inverter 299 to the reset output of the flip-flop 262. The pulse so developed is applied through the AND-gate 269 and an OR- gate 300 to the binary input of the flip-flop 264, to set flip-flop 264. Thus flip-

flops

261, 262 and 263 are reset, while flip-flop 264 is set, and a count of five is stored.

The sixth, seventh, eighth and ninth input pulses perform operations similar to those performed by the first, second, third and fourth pulses respectively.

The tenth pulse produces an operation similar to that of the fifth input pulse but is different in that the flip-flop 264 is reset. When flip-flop 264 is reset, an output pulse is developed by a negative input pulser 301, connected through an inverter 302 to the reset output of the flip-flop 264, and is applied through AND-gate 270, an OR-gate 303 and an emitter-follower 304 to an output terminal 305 which is connected to the input terminal 281 of the next unit. The pulse so applied operates as a carry pulse in the addition operation. In the subtraction operation, a borrow pulse is developed at the terminal 305.

With respect to the subtraction operation, reference is made to the foregoing discussion of the operation of the end point storage unit of FIG. 6 of parent US. Pat. No. 3,506,812. With the minus gate 271-275 enabled by application of a signal to the input terminal 280, the connection of circuit component is substantially the same as that described above. It is noted that for such operation, the set output of the flipflop 261 is connected through an inverter 307 to a negative input pulser 308, the signal being developed at the output of the pulser 308 when the flip-flop 261 is set. Similarly, the set output of the flip-flop 263 is connected through an inverter 309 to a negative input pulser 310 connected to the gate 274, and the set output of the flip-flop 264 is connected through an inverter 31] to a negative input pulser 312 connected to an input of the gate 275. When the flip-

flops

263 and 264 are set, corresponding signals are developed at the outputs of the pulsers 310 and 312.

It is noted that the lines 132-135 are respectively connected to the outputs of the

inverters

302, 287, 299 and 286 connected to the reset outputs of the flip-

flops

264, 263, 262 and 261 are high when the respective flip-flops are set.

Reset and set inputs of the flip-flops 261-264 are connected to dual transfer circuits or units 317-320 having inputs connected to reset and set outputs of the flip-flops 257-260. The transfer signal is applied to the units 317-320 from a complementary emitter-follower 321 connected to an input terminal 322. Set inputs of the flip-flops 257-260 are connected to transfer units 323-326 having inputs connected to (l), (1'), (2) and (5) data input lines 327-330 from the coded tape reader. A transfer pulse is applied to the unit 323-326 from a complementary emitter-follower 331 having an input connected to the output of an OR-gate 332 having a first input connected to an input terminal 333 and a second input connected to the output of a gate 334 having a first input connected to a terminal 335 and a second input connected to a terminal 336 and also to the output ofa gate 337 having inputs connected to

terminals

339 and 340.

Reset inputs of the flip-flops 257-260 are connected through a resistor 341 to the output of a complementary emitter-follower 342 having an input connected to a terminal 343. Similarly, reset outputs of the flip-flops 261-264 are connected through a resistor 344 to the output of a complementary emitter-follower 345 having an input connected to a terminal 346.

In operation, a reset signal may be applied to terminal 346 to place the final storage flip-flops 261-264 in a reset condition. A transfer pulse may then be applied to the terminal 332 to transfer to the flip-flops 261-264 information which was previously stored in the flip-flops 257-260. A reset signal may then. be applied to the terminal 343 to reset the flip-flops 357-360 and suitable signals may be applied from the tape reader to the terminal 336 or to the

terminals

339 and 340, after which a data insert signal may be applied to the terminal 335 to cause operation of the transfer units 323-326 and to store information applied from the lines 327-330.

In linear interpolation, as discussed above, the same information is applied to the integrand unit as applied to the end point storage units, and terminals 333 of each integrand unit may be connected to the terminal 242 of the corresponding end point storage unit. Thus, data inputs 327-330 may be connected in parallel with the date inputs 227-330.

The integrand unit of FIG. 7 incorporates a zero sensing system similar to that of the end point storage unit of FIG. 6. In particular, a gate 350 is provided having an output connected to a terminal 351 and having five inputs, one of which is connected to a terminal 352. The other four inputs of the gate 330 are connected to the output of the inverter 307, to the output of the inverter 294, to the output of the inverter 309 and to the output of the inverter 311, to develop an output at the terminal 351 when an input signal is applied to the terminal 352 and when all four of the flip-flops 261-264 are reset. Input terminal 352 is connected to the output terminal 351 of the next higher significant unit, or to a signal source in the case of the first unit, an output terminal 351 of the final unit is connected to the start-stop control and end point correction circuit 61.

It will be understood that modifications and variations may be effected without departing from the spirit and scope of the novel concepts of this invention.

I claim as my invention:

1. A digital computer system,

a. a pulse code unit 76 having an input 536 for receiving a series of 10 input pulses (FIG. 5) in each cycle of operation, said pulse code unit 76 having four noncarry outputs -148 and a carry output 151 and being operable in each cycle of operation to produce respective series of noncarry pulses (FIG. 5) at the respective four noncarry outputs and produce a carry pulse (FIG. 5) at said carry output, with the numbers of noncarry pulses in said series being selectively addable to produce any number from one through nine and with the noncarry pulses of each series being noncoincident with the carry pulse and with the noncarry pulses of each of the other series,

b. a series of accumulator register decade units 71-75 for storing respective decimal digits therein and connected in cascade for representing successive decimal orders, and including a lowest order accumulator register decade unit, a highest order accumulator register decade unit and intervening order accumulator register decade units representing decimal orders intervening between the lowest order and the highest order of said successive decimal orders, each accumulator register decade unit comprising a decade counter 111-114 having a decade counter input circuit 119 and a decade counter output circuit 161,

c. respective sets of four gates 122-125 having outputs connected to the respective decade counter input circuits 119 of the respective accumulator register decade units 71-75, each set of four gates 122-125 having at least two inputs per gate, one such input being connected to a respective one of the noncarry outputs 145-148 and other such input being controlled by a respective bit of a plural order coded decimal signal having respective weights at its successive bit positions corresponding to the numbers of noncarry pulses of the respective series and having respective orders corresponding to the successive decimal orders represented by said series of accumulator register decade units, said sets of gates 122-125 thereby being controllable to supply numbers of noncarry pulses to the decade counter input circuits 1 19 of the respective accumulator register decade units simultaneously in accordance with said plural order coded decimal signal, in each cycle of operation of said pulse code unit,

, said accumulator register decade units 71-75 each including a carry storage circuit 173 connected with the decade counter output circuit 161 thereof for assuming an active condition in response to a decade carry pulse from such decade counter output circuit 161 at a count of IQ of the decade counter 1 11-1 14 thereof, without transmission of said decade carry pulse to the input circuit 1 19 of the next succeeding accumulator register decade unit,

. said carry storage circuits 173 of the respective accumulator register decade units being all connected with the carry output 151 of said pulse code unit 76 for receipt of the carry pulse therefrom, said carry storage circuits 173 when in said active condition being responsive to a carry pulse from said pulse code unit 76 to transmit an effective carry pulse to the decade counter input circuit 119 of the next succeeding accumulator register decade unit to provide for the counting of such effective carry pulses, and whereby said plural order coded decimal signal may be altered during the time of the carry pulses from the carry output 151 of said pulse code unit 76.

. In a digital computer system, an operational integator 41 comprising an integrand rea parallel transfer circuit 317-320 operative with a l, l,

2, code for applying information in parallel to

respective stages

261, 262, 263, and 264 of each decade unit of said integrand register 81-85, with the successive stages 261-264 thus representing weights of l, l, 2 and 5, respectively,

. respective sets of gates 122-125 connected with the inputs 119 of the respective accumulator decade units, each set of gates 122-125 being operatively controlled in parallel by

respective stages

264, 263, 262, and 261 of a corresponding integrand decade unit in such 1, 1, 2, 5 code, and

. a 5, 2, l, 1 pulse code unit 76 having noncarry outputs 145-148 connected to the respective gates 122-125 of each of said sets of gates 122-125, and having a carry output 151, said pulse code unit 76 being responsive, during a cycle of operation thereof, to a series of input pulses (FIG. 5) to generate at a first noncarry output 145 five noncarry pulses, at a second noncarry output 146 two noncarry pulses, at a third noncarry output 147 one noncarry pulse, and at a fourth noncarry output 148 one noncarry pulse, respectively, and to generate a carry pulse at said carry output 151 which is subsequent to said noncarry pulses, with transmission by each set of gates 122-125 to the input 119 of the associated accumulator decade unit of a number of noncarry pulses corresponding to the digit registered by the associated integrand decade unit in said 1, l, 2, 5 code, said pulse code unit 76 being responsive to said series of 10 input pulses to simultaneously operate all of said accumulator decade units 71-75 through an addition cycle to cause each accumulator decade unit to add to a number stored therein at the beginning of each cycle of operation of said pulse code unit 76, a number corresponding to the number of noncarry pulses supplied thereto by the associated set of gates 122-125 during said cycle of operation, and corresponding to the number registered by the associated integrand decade unit, any decade carry pulses caused by a count of 10 of the respective accumulator decade units 72-75 serving to set the respective associated bistable carry storage circuit 173 without transmission of such decade carry pulses to the input 119 of the following accumulator decade unit,

said bistable carry storage circuits 173 being connected to the carry output 151 of said pulse code unit 76 to receive said carry pulse therefrom and being responsive to such carry pulse, when in set condition, to transmit an effective carry pulse to the input 119 of the next succeeding accumulator decade unit for counting thereby, whereby the number registered by said integrand register 81-85 may be changed during the output of the carry pulse from the carry output 151 of the pulse code unit 76 without spuriously affecting the number of noncarry pulses transmitted by said sets of gates 122-125.

In a digital computer system,

an operational integator 41 comprising an integrand register 81-85 and an accumulator register 71-75 including, respectively, serially connected integrand decade units 81-85, and serially connected accumulator decade units 71-75, with bistable carry storage circuits 173 interposed between the output 161 of each accumulator decade unit and the input 119 of the next succeeding accumulator decade unit,

respective stages

264, 263, 262, and 261 of a corresponding integrand decade unit, and

. a pulse code unit 76 having noncarry outputs -148 connected to the respective gates 122-125 of each of said sets of gates 122-125 and having a carry output 151, said pulse code unit 76 being responsive, during a cycle of operation thereof, to a series of 10 input pulses to produce four series of noncarry pulses at the respective noncarry outputs 145-148 and a carry pulse at the carry output 151, with the numbers of noncarry pulses in said series being selectively addable by control of said gates 122-125 to produce at the inputs 119 of the respective accumulator decade units any number of noncarry pulses from 1 through 9, and with the noncarry pulses of each series being noncoincident with the carry pulse and noncoincident with the noncarry pulses of each of the other series, with transmission by each set of gates 122-125 to the input 119 of the associated accumulator decade unit of a number of noncarry pulses corresponding to the digit registered by the associated integrand decade unit, said pulse code unit 76 being responsive to said series of 10 input pulses to simultaneously operate all of said accumulator decade units 71-75 through an addition cycle to cause each accumulator decade unit to add to a number stored therein at the beginning of each cycle of operation of said pulse code unit 76, a number corresponding to the number of noncarry pulses supplied thereto by the associated set of gates 122-125 during said cycle of operation, any decade carry pulses caused by a count of 10 of the respective accumulator decade units 71-75 serving to set the respective associated bistable carry storage circuit 173 without transmission of such decade carry pulses to the input 1 19 of the following accumulator decade unit, said bistable carry storage circuits 173 being connected to the carry output 151 of said pulse code unit 76 to receive said carry pulse therefrom and being responsive to such carry pulse, when in set condition, to transmit an effective carry pulse to the input 119 of the next succeeding accumulator decade unit for counting thereby, whereby the number registered by said integrand register 81-85 may be changed during the output of the carry pulse from the carry output 151 of the pulse code unit 76 without interfering with the transmission of noncarry pulses by said sets of gates 122-125.

4. In a digital computer system,

a. an operational integator 41 comprising an integrand register 81-85 and an accumulator register 71-75 including, respectively, serially connected integrand decade units 81-85, and serially connected accumulator decade units 71-75, with bistable carry storage circuits 173 interposed between the output 161 of each accumulator decade unit and the input 119 of the next succeeding accumulator decade unit,

b, respective sets of gates 122-125 connected with the inputs 119 of the respective accumulator decade units, each set of gates 122-125 being operatively controlled in parallel by

respective stages

264, 263, 262, and 261 of a corresponding integrand decade unit,

c. a pulse code unit 76 having noncarry outputs 145-148 connected to the respective gates 122-125 of each of said sets of gates 122-125 and having a carry output 151, said pulse code unit 76 being responsive, during a cycle of operation thereof, to a series of input pulses to produce four series of noncarry pulses at the respective noncarry outputs 145-148 and a carry pulse at the carry output 151, with the numbers of noncarry pulses in said series being selectively addable by control of said gates 122-125 to produce at the inputs 119 of the respective accumulator decade units any number of noncarry pulses from 1 through 9, and with the noncarry pulses of each series being noncoincident with the carry pulse and noncoincident with the noncarry pulses of each of the other series, with transmission by each set of gates 122-125 to the input 119 of the associated accumulator decade unit of a number of noncarry pulses corresponding to the digit registered by the associated integrand decade unit, said pulse code unit 76 being responsive to said series of 10 input pulses to simultaneously operate all of said accumulator decade units 71-75 through an addition cycle to cause each accumulator decade unit to add to a number stored therein at the beginning of each cycle of operation of said pulse code unit 76, a number corresponding to the number of noncarry pulses supplied thereto by the associated set of gates 122-125 during said cycle of operation, any decade carry pulses caused by a count of 10 of the respective accumulator decade units 71-75 serving to set the respective associated bistable carry storage circuit 173 without transmission of such decade carry pulses to the input 119 of the following accumulator decade unit,

(1. said bistable carry storage circuits 173 being connected to the carry output 151 of said pulse code unit 76 to receive said carry pulse therefrom and being responsive to such carry pulse, when in set condition, to transmit an effective carry pulse to the input 119 of the next succeeding accumulator decade unit for counting thereby, whereby the number registered by said integrand register 81-85 may be changed during the output of the carry pulse from the carry output 151 of the pulse code unit 76 without interfering with the transmission of noncarry pulses by said sets of gates 122-125, and

e. a serial connection circuit 266-275 for connecting said integrand decade units 261-264 in series for serially counting pulses supplied to an input 281 of said integrand register 81-85, and said integrand register 81-85 being responsive to pulses supplied to its input 281 during the time of generation of said carry pulse at said carry output 151 of said pulse code unit 76 to provide for serial modification of the number stored in aid integrand register without interfering with the transmission of noncarry pulses by said sets of gates 122-125.

5. In a digital computer system in accordance with claim 4, said serially connected integrand decade units 81-85 each comprising four flip-flops 261-264 respectively representing digits selectively addable to produce any digit from 1 through 9, each integrand decade unit 81-85 including a delay circuit 289 connected with said input 281 for responding to said input pulses to produce delayed pulses, and said serial connection circuit 266-275 comprising

gates

266, 272 and 267, 271 for selectively applying said input and delayed pulses to said flipflops 261-264, said integrand register being operable to respond to each input pulse and associated delayed pulse for shifting by one the count stored therein.

6. In a digital computer system in accordance with claim 4, said serially connected integrand decade units 81-85 each comprising four flip-flops 261-264 respectively representing digits selectively addable to produce any digit from 1 through 9, said serial connection circuit 266-275 being operable in a countdown mode to respond to each input pulse at said input 281 of said integrand register to reduce by one the count stored therein, means 312 associated with said serial connection circuit 266-275 for generating a borrow pulse when all of said flip-flops 261-264 are reset to represent a zero count, and means 305 connecting said integrand decade units 81-85 in series to apply a borrow pulse from each integrand decade unit to the input 281 ofa succeeding integrand decade unit.

7. In a digital computer system in accordance with claim 4, said integrand decade units 81-85 each comprising four

flipflops

261, 262, 263, and 264 with a zero count being represented by a reset condition of all four of said flip-flops 261-264, an AND-gate 350 in each unit having five

inputs

352, 307, 294, 309 and 311 and an output 351, means connecting one 352 of said inputs to the output 351 of the succeeding integrand decade unit of next higher significance, and means connecting the other four 307, 294, 30? and 311 of said five inputs to said four flip-flops 261-264 to develop an output from said gate 350 in response to concurrence of a reset condition of all four of said flip-flops 261-264 and a signal from the output 351 of the gate 350 of the succeeding integrand decade unit.

8. In a digital computer system,

a. a pulse code unit 76 having noncarry outputs -148 and a carry output 151, and operable through a cycle of operation in response to application of 10 input pulses thereto for producing at the respective noncarry outputs 145-148 first, second, third and fourth series of noncarry pulses and for producing at the carry output 151 a carry pulse, said first series comprising five noncarry pulses coincident with the first, third, fifth, seventh and ninth of said 10 input pulses, said second series comprising two noncarry pulses coincident with the second and with the sixth of said 10 input pulses, said third series comprising one noncarry pulse coincident with the fourth of said l0 input pulses, said fourth series comprising one pulse coincident with the eighth of said 10 input pulses, and said carry pulse being coincident with the 10 th pulse of said 10 input pulses,

b. a plurality of accumulator register units 71-75 connected in cascade and each comprising a decade counter 111-114 having an input 119 and an output 161, and having a bistable carry storage circuit 173 connected between the output 161 of each decade counter and the input 1 19 of the next succeeding decade counter,

c. respective sets of first, second, third and fourth gates 122-125 connected with the respective noncarry outputs 145-148 of said pulse code unit 76 for respectively applying said first, second, third and fourth series of noncarry pulses to the input 1 19 of each of said decade counters,

d. means 81-85 for selectively controlling said gates 122-125 in accordance with respective bits of a plural order coded decimal number weighted according to a 5, 2, l, 1 code so as to supply in parallel and simultaneously to the inputs 119 of the respective decade counters numbers of noncarry pulses from the pulse code unit in accordance with the respective digits of the plural order coded decimal number, during application of said 10 input pulses to said pulse code unit 76,

c. said bistable carry storage circuits 173 being operable for storing a decade carry pulse from the decade counters 111-114 in response to a count of 10 of said decade counters 111-1 14, and

f. said carry output 151 of said pulse code unit 76 being connected to a reset input of each of said bistable carry storage circuits 173 to cause an effective carry pulse to be transmitted from the bistable carry storage circuit 173 to the input 119 of the next decade counter, when a decade carry pulse has caused the previous setting of the bistable carry storage circuit, the effective carry pulses being generated in response to the carry pulse from the puls code unit 76.

9. In a digital computer system in with claim 8, said means 81-85 for selectively controlling said gates 122-125 comprising an integrand register 81-85 having successive integrand decade counters each comprising four flip-flops 261-264 respectively representing digits in a l, l, 2, code, input means 281 for connection to a source of input pulses synchronized with the carry pulse from said carry output 151 of said pulse code unit 76, pulse-channelling means including gates 268-270 and 273-275 and 285 and 293 controlled by said flip-flops 261-264 for selectively triggering said flip-flops 261-264 in response to said input pulses for shifting by one the count stored in said integrand register 81-85 in response to each input pulse, and means 277, 278, 266-275 for selectively operating said pulse-channelling means in an addition mode wherein each input pulse increases the stored count by one and in subtraction mode wherein each input pulse decreases the stored count by one.

10. In a digital computer system in accordance with claim 8, said means 81-85 for selectively controlling said gates 122-125 comprising a series of integrand decade counters each comprising four flip-flops 261-264 respectively representing weights of l, l, 2 and 5, input means 281 for connection to a source of input pulses synchronized with the carry pulse from the carry output 151 of said pulse code unit 76, signal-channelling means including gates 268-270, 273-275, 285 and 293 controlled by said flip-flops 261-264 for selectively triggering said flip-flops 261-264 in response to input pulses for shifting by one the counts stored in said integrand register units 81-85 in response to each input pulse, and four output lines 132-135 respectively connected to the outputs of said four flip-

flops

264, 263, 262 and 261 and connected to respective gates 122-125 of each of said sets of gates 122-125.

Po-ww UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3'644'723 Dat d r ry 2, 1972 I Harvey J. Rosener It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column 8, Line 17 "date" should read -data-- Column 8, Line 38 Before "A" insert In- Column ll, Line 65 "aid" should read --said-- Column 13, Line 10 After "in" insert --ac cordance- (second occurrence) Signed and sealed this 25th day of July 1972.

(SEAL) Attest:

EDWARD M.FLETCHER,JR. ROBERT GOTTSGHALK Attesting Officer Commissioner of Patents

Claims

1. A digital computer system, a. a pulse code unit 76 having an input 536 for receiving a series of 10 input pulses (FIG. 5) in each cycle of operation, said pulse code unit 76 having four noncarry outputs 145-148 and a carry output 151 and being operable in each cycle of operation to produce respective series of noncarry pulses (FIG. 5) at the respective four noncarry outputs and produce a carry pulse (FIG. 5) at said carry output, with the numbers of noncarry pulses in said series being selectively addable to produce any number from one through nine and with the noncarry pulses of each series being noncoincident with the carry pulse and with the noncarry pulses of each of the other series, b. a series of accumulator register decade units 71-75 for storing respective decimal digits therein and connected in cascade for representing successive decimal orders, and including a lowest order accumulator register decade unit, a highest order accumulator register decade unit and intervening order accumulator register decade units representing decimal orders intervening between the lowest order and the highest order of said successive decimal orders, each accumulator register decade unit comprising a decade counter 111-114 having a decade counter input circuit 119 and a decade counter output circuit 161, c. respective sets of four gates 122-125 having outputs connected to the respective decade counter input circuits 119 of the respective accumulator register decade units 71-75, each set of four gates 122-125 having at least two inputs per gate, one such input being connected to a respective one of the noncarry outputs 145-148 and other such input being controlled by a respective bit of a plural order coded decimal signal having respective weights at its successive bit positions corresponding to the numbers of noncarry pulses of the respective series and having respective orders corresponding to the successive decimal orders represented by said series of accumulator register decade units, said sets of gates 122-125 thereby being controllable to supply numbers of noncarry pulses to the decade counter input circuits 119 of the respective accumulator register decade units simultaneously in accOrdance with said plural order coded decimal signal, in each cycle of operation of said pulse code unit, d. said accumulator register decade units 71-75 each including a carry storage circuit 173 connected with the decade counter output circuit 161 thereof for assuming an active condition in response to a decade carry pulse from such decade counter output circuit 161 at a count of 10 of the decade counter 111114 thereof, without transmission of said decade carry pulse to the input circuit 119 of the next succeeding accumulator register decade unit, e. said carry storage circuits 173 of the respective accumulator register decade units being all connected with the carry output 151 of said pulse code unit 76 for receipt of the carry pulse therefrom, said carry storage circuits 173 when in said active condition being responsive to a carry pulse from said pulse code unit 76 to transmit an effective carry pulse to the decade counter input circuit 119 of the next succeeding accumulator register decade unit to provide for the counting of such effective carry pulses, and whereby said plural order coded decimal signal may be altered during the time of the carry pulses from the carry output 151 of said pulse code unit 76.

2. In a digital computer system, a. an operational integator 41 comprising an integrand register 81-85 and an accumulator register 71-75 including, respectively, serially connected integrand decade units 261-264, and serially connected accumulator decade units 111-114, with bistable carry storage circuits 173 interposed between the output 161 of each accumulator decade unit and the input 119 of the next succeeding accumulator decade unit, b. a parallel transfer circuit 317-320 operative with a 1, 1'', 2, 5 code for applying information in parallel to respective stages 261, 262, 263, and 264 of each decade unit of said integrand register 81-85, with the successive stages 261-264 thus representing weights of 1, 1, 2 and 5, respectively, c. respective sets of gates 122-125 connected with the inputs 119 of the respective accumulator decade units, each set of gates 122-125 being operatively controlled in parallel by respective stages 264, 263, 262, and 261 of a corresponding integrand decade unit in such 1, 1'', 2, 5 code, and d. a 5, 2, 1'', 1 pulse code unit 76 having noncarry outputs 145-148 connected to the respective gates 122-125 of each of said sets of gates 122-125, and having a carry output 151, said pulse code unit 76 being responsive, during a cycle of operation thereof, to a series of 10 input pulses (FIG. 5) to generate at a first noncarry output 145 five noncarry pulses, at a second noncarry output 146 two noncarry pulses, at a third noncarry output 147 one noncarry pulse, and at a fourth noncarry output 148 one noncarry pulse, respectively, and to generate a carry pulse at said carry output 151 which is subsequent to said noncarry pulses, with transmission by each set of gates 122-125 to the input 119 of the associated accumulator decade unit of a number of noncarry pulses corresponding to the digit registered by the associated integrand decade unit in said 1, 1'', 2, 5 code, said pulse code unit 76 being responsive to said series of 10 input pulses to simultaneously operate all of said accumulator decade units 71-75 through an addition cycle to cause each accumulator decade unit to add to a number stored therein at the beginning of each cycle of operation of said pulse code unit 76, a number corresponding to the number of noncarry pulses supplied thereto by the associated set of gates 122-125 during said cycle of operation, and corresponding to the number registered by the associated integrand decade unit, any decade carry pulses caused by a count of 10 of the respective accumulator decade units 72-75 serving to set the respective associated bistable carry storage circuit 173 without transmission of suCh decade carry pulses to the input 119 of the following accumulator decade unit, e. said bistable carry storage circuits 173 being connected to the carry output 151 of said pulse code unit 76 to receive said carry pulse therefrom and being responsive to such carry pulse, when in set condition, to transmit an effective carry pulse to the input 119 of the next succeeding accumulator decade unit for counting thereby, whereby the number registered by said integrand register 81-85 may be changed during the output of the carry pulse from the carry output 151 of the pulse code unit 76 without spuriously affecting the number of noncarry pulses transmitted by said sets of gates 122-125.

3. In a digital computer system, a. an operational integator 41 comprising an integrand register 81-85 and an accumulator register 71-75 including, respectively, serially connected integrand decade units 81-85, and serially connected accumulator decade units 71-75, with bistable carry storage circuits 173 interposed between the output 161 of each accumulator decade unit and the input 119 of the next succeeding accumulator decade unit, b. respective sets of gates 122-125 connected with the inputs 119 of the respective accumulator decade units, each set of gates 122-125 being operatively controlled in parallel by respective stages 264, 263, 262, and 261 of a corresponding integrand decade unit, and c. a pulse code unit 76 having noncarry outputs 145-148 connected to the respective gates 122-125 of each of said sets of gates 122-125 and having a carry output 151, said pulse code unit 76 being responsive, during a cycle of operation thereof, to a series of 10 input pulses to produce four series of noncarry pulses at the respective noncarry outputs 145-148 and a carry pulse at the carry output 151, with the numbers of noncarry pulses in said series being selectively addable by control of said gates 122-125 to produce at the inputs 119 of the respective accumulator decade units any number of noncarry pulses from 1 through 9, and with the noncarry pulses of each series being noncoincident with the carry pulse and noncoincident with the noncarry pulses of each of the other series, with transmission by each set of gates 122-125 to the input 119 of the associated accumulator decade unit of a number of noncarry pulses corresponding to the digit registered by the associated integrand decade unit, said pulse code unit 76 being responsive to said series of 10 input pulses to simultaneously operate all of said accumulator decade units 71-75 through an addition cycle to cause each accumulator decade unit to add to a number stored therein at the beginning of each cycle of operation of said pulse code unit 76, a number corresponding to the number of noncarry pulses supplied thereto by the associated set of gates 122-125 during said cycle of operation, any decade carry pulses caused by a count of 10 of the respective accumulator decade units 71-75 serving to set the respective associated bistable carry storage circuit 173 without transmission of such decade carry pulses to the input 119 of the following accumulator decade unit, d. said bistable carry storage circuits 173 being connected to the carry output 151 of said pulse code unit 76 to receive said carry pulse therefrom and being responsive to such carry pulse, when in set condition, to transmit an effective carry pulse to the input 119 of the next succeeding accumulator decade unit for counting thereby, whereby the number registered by said integrand register 81-85 may be changed during the output of the carry pulse from the carry output 151 of the pulse code unit 76 without interfering with the transmission of noncarry pulses by said sets of gates 122-125.

4. In a digital computer system, a. an operational integator 41 comprising an integrand register 81-85 and an accumulator register 71-75 including, respectively, serially connected inTegrand decade units 81-85, and serially connected accumulator decade units 71-75, with bistable carry storage circuits 173 interposed between the output 161 of each accumulator decade unit and the input 119 of the next succeeding accumulator decade unit, b. respective sets of gates 122-125 connected with the inputs 119 of the respective accumulator decade units, each set of gates 122-125 being operatively controlled in parallel by respective stages 264, 263, 262, and 261 of a corresponding integrand decade unit, c. a pulse code unit 76 having noncarry outputs 145-148 connected to the respective gates 122-125 of each of said sets of gates 122-125 and having a carry output 151, said pulse code unit 76 being responsive, during a cycle of operation thereof, to a series of 10 input pulses to produce four series of noncarry pulses at the respective noncarry outputs 145-148 and a carry pulse at the carry output 151, with the numbers of noncarry pulses in said series being selectively addable by control of said gates 122-125 to produce at the inputs 119 of the respective accumulator decade units any number of noncarry pulses from 1 through 9, and with the noncarry pulses of each series being noncoincident with the carry pulse and noncoincident with the noncarry pulses of each of the other series, with transmission by each set of gates 122-125 to the input 119 of the associated accumulator decade unit of a number of noncarry pulses corresponding to the digit registered by the associated integrand decade unit, said pulse code unit 76 being responsive to said series of 10 input pulses to simultaneously operate all of said accumulator decade units 71-75 through an addition cycle to cause each accumulator decade unit to add to a number stored therein at the beginning of each cycle of operation of said pulse code unit 76, a number corresponding to the number of noncarry pulses supplied thereto by the associated set of gates 122-125 during said cycle of operation, any decade carry pulses caused by a count of 10 of the respective accumulator decade units 71-75 serving to set the respective associated bistable carry storage circuit 173 without transmission of such decade carry pulses to the input 119 of the following accumulator decade unit, d. said bistable carry storage circuits 173 being connected to the carry output 151 of said pulse code unit 76 to receive said carry pulse therefrom and being responsive to such carry pulse, when in set condition, to transmit an effective carry pulse to the input 119 of the next succeeding accumulator decade unit for counting thereby, whereby the number registered by said integrand register 81-85 may be changed during the output of the carry pulse from the carry output 151 of the pulse code unit 76 without interfering with the transmission of noncarry pulses by said sets of gates 122-125, and e. a serial connection circuit 266-275 for connecting said integrand decade units 261-264 in series for serially counting pulses supplied to an input 281 of said integrand register 81-85, and said integrand register 81-85 being responsive to pulses supplied to its input 281 during the time of generation of said carry pulse at said carry output 151 of said pulse code unit 76 to provide for serial modification of the number stored in aid integrand register without interfering with the transmission of noncarry pulses by said sets of gates 122-125.

5. In a digital computer system in accordance with claim 4, said serially connected integrand decade units 81-85 each comprising four flip-flops 261-264 respectively representing digits selectively addable to produce any digit from 1 through 9, each integrand decade unit 81-85 including a delay circuit 289 connected with said input 281 for responding to said input pulses to produce delayed pulses, and said serial connection circuit 266-275 comprising gates 266, 272 and 267, 271 for selectivEly applying said input and delayed pulses to said flip-flops 261-264, said integrand register being operable to respond to each input pulse and associated delayed pulse for shifting by one the count stored therein.

6. In a digital computer system in accordance with claim 4, said serially connected integrand decade units 81-85 each comprising four flip-flops 261-264 respectively representing digits selectively addable to produce any digit from 1 through 9, said serial connection circuit 266-275 being operable in a countdown mode to respond to each input pulse at said input 281 of said integrand register to reduce by one the count stored therein, means 312 associated with said serial connection circuit 266-275 for generating a borrow pulse when all of said flip-flops 261-264 are reset to represent a zero count, and means 305 connecting said integrand decade units 81-85 in series to apply a borrow pulse from each integrand decade unit to the input 281 of a succeeding integrand decade unit.

7. In a digital computer system in accordance with claim 4, said integrand decade units 81-85 each comprising four flip-flops 261, 262, 263, and 264 with a zero count being represented by a reset condition of all four of said flip-flops 261-264, an AND-gate 350 in each unit having five inputs 352, 307, 294, 309 and 311 and an output 351, means connecting one 352 of said inputs to the output 351 of the succeeding integrand decade unit of next higher significance, and means connecting the other four 307, 294, 309 and 311 of said five inputs to said four flip-flops 261-264 to develop an output from said gate 350 in response to concurrence of a reset condition of all four of said flip-flops 261-264 and a signal from the output 351 of the gate 350 of the succeeding integrand decade unit.

8. In a digital computer system, a. a pulse code unit 76 having noncarry outputs 145-148 and a carry output 151, and operable through a cycle of operation in response to application of 10 input pulses thereto for producing at the respective noncarry outputs 145-148 first, second, third and fourth series of noncarry pulses and for producing at the carry output 151 a carry pulse, said first series comprising five noncarry pulses coincident with the first, third, fifth, seventh and ninth of said 10 input pulses, said second series comprising two noncarry pulses coincident with the second and with the sixth of said 10 input pulses, said third series comprising one noncarry pulse coincident with the fourth of said 10 input pulses, said fourth series comprising one pulse coincident with the eighth of said 10 input pulses, and said carry pulse being coincident with the 10 th pulse of said 10 input pulses, b. a plurality of accumulator register units 71-75 connected in cascade and each comprising a decade counter 111-114 having an input 119 and an output 161, and having a bistable carry storage circuit 173 connected between the output 161 of each decade counter and the input 119 of the next succeeding decade counter, c. respective sets of first, second, third and fourth gates 122-125 connected with the respective noncarry outputs 145-148 of said pulse code unit 76 for respectively applying said first, second, third and fourth series of noncarry pulses to the input 119 of each of said decade counters, d. means 81-85 for selectively controlling said gates 122-125 in accordance with respective bits of a plural order coded decimal number weighted according to a 5, 2, 1'', 1 code so as to supply in parallel and simultaneously to the inputs 119 of the respective decade counters numbers of noncarry pulses from the pulse code unit in accordance with the respective digits of the plural order coded decimal number, during application of said 10 input pulses to said pulse code unit 76, e. said bistable carry storage circuits 173 being operable for storing a decade carry pulse from The decade counters 111-114 in response to a count of 10 of said decade counters 111-114, and f. said carry output 151 of said pulse code unit 76 being connected to a reset input of each of said bistable carry storage circuits 173 to cause an effective carry pulse to be transmitted from the bistable carry storage circuit 173 to the input 119 of the next decade counter, when a decade carry pulse has caused the previous setting of the bistable carry storage circuit, the effective carry pulses being generated in response to the carry pulse from the pulse code unit 76.

9. In a digital computer system in with claim 8, said means 81-85 for selectively controlling said gates 122-125 comprising an integrand register 81-85 having successive integrand decade counters each comprising four flip-flops 261-264 respectively representing digits in a 1, 1'', 2, 5 code, input means 281 for connection to a source of input pulses synchronized with the carry pulse from said carry output 151 of said pulse code unit 76, pulse-channelling means including gates 268-270 and 273-275 and 285 and 293 controlled by said flip-flops 261-264 for selectively triggering said flip-flops 261-264 in response to said input pulses for shifting by one the count stored in said integrand register 81-85 in response to each input pulse, and means 277, 278, 266-275 for selectively operating said pulse-channelling means in an addition mode wherein each input pulse increases the stored count by one and in subtraction mode wherein each input pulse decreases the stored count by one.

10. In a digital computer system in accordance with claim 8, said means 81-85 for selectively controlling said gates 122-125 comprising a series of integrand decade counters each comprising four flip-flops 261-264 respectively representing weights of 1, 1, 2 and 5, input means 281 for connection to a source of input pulses synchronized with the carry pulse from the carry output 151 of said pulse code unit 76, signal-channelling means including gates 268-270, 273-275, 285 and 293 controlled by said flip-flops 261-264 for selectively triggering said flip-flops 261-264 in response to input pulses for shifting by one the counts stored in said integrand register units 81-85 in response to each input pulse, and four output lines 132-135 respectively connected to the outputs of said four flip-flops 264, 263, 262 and 261 and connected to respective gates 122-125 of each of said sets of gates 122-125.