EXPERIMENT IN DEVELOPING THE COMPUTING COMPLEX OF A SMALL TRANSISTORIZED DIGITAL COMPUTER,

A series of computer circuits and a general-purpose computer arithmetic unit AU using those circuits, which were designed at the Moscow Power Engineering Institute, are described. The following circuits were designed flip-flop, an element realizing gating-fan-in-shaping a decoder element performing a logical function z x1 xy1 xy2 xy3 xy4 xy5, a pulse-stretcher, an inverter, and a passive delay line. All circuits are based on P-16 transistors, which use a -12-volt and 2.5-volt bias supply. The circuits are designed to operate at 400kHg clock frequency in a -20 - 60C temperature range. The authors also describes a 40-bit parallel arithmetic unit operating on numbers in the floating point mode. The AU based on these circuits features a structure the implementation of which resulted in improved computing speed, reliability, and economy. The machine performs 80,000 additionssec, 25,000 multiplicationssec, or 10,000 divisionssec, and uses only 40 transistors and 120 diodes for each bit processed by the AU. Author