A Transistorized Digital Computer,

The M-54 general-purpose transistorized digital computer is described. The computer is a modification of one of the first transistorized computer models unspecified developed at the Moscow Order of Lenin Power Engineering Institute. This single-address machine is capable of executing 16,000 additions, 3,000 multiplications, or 33,000 logic operationssec in the fixed point mode. In the floating point mode, 5,000 additionssec are possible. The machine uses 5,200 transistors, 13,500 semiconductor diodes, and 100,000 magnetic cores. The arithmetic unit has a parallel action adder-accumulator acting on 40-bit words. The main core memory has a capacity of 4,096 20-bit words. Access time is 10 mu sec. The read-only memory capacity, 4,096 20-bit words, uses ferrite cores and an access time of 3.mu sec. The magnetic tape-file memory, capable of reading or recording 2,000 wordssec., has a capacity of 100, 000 20 bit words. Two such units may be used in the system. Input is from a perforated tape input speed is 100 20-bit wordssec. The output unit is in the form of a line-at-a-time printer capable of delivering 10 linessec, with each line containing 11 positions. Four persons are required for normal servicing. Author