OPERATIONS CONTROL UNIT IN A SPECIAL PURPOSE DIGITAL CONTROL COMPUTER,

A list of instructions to be realized by the computer serves as initial data for designing the control unit which comprises a clock-pulse unit, a micro-operation control circuit, and an operation decoder. The clock-pulse unit produces pulses and sequentially distributes them among its trunks. The control circuit handles microprograms consisting of 38 micro operations a 10-cycle microprogram table is shown. Ferrite-core circuits are used throughout. The control unit operates on a two-cycle principle a read cycle for one group of cores serves simultaneously as a preparatory cycle for another group. The micro-operation control circuit comprises 5 core groups. The operation decoder is built on a two-step principle first-step cores perform logical multiplication of the first three variables X1X2X3 of the operation second-step cores, multiplication of the remaining two variables X4X5. The clock frequency can go as high as 30 kc pulse height, 0.4 amp pulse duration, 8 microsec. The above control unit exhibited reliable operation in conjunction with a laboratory model of a small-size control digital computer.