CDC 1604

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CDC 1604 with console [1]

The CDC 1604 was a 48-bit mainframe computer, designed and manufactured by Seymour Cray and his team at the Control Data Corporation [2], introduced in October 1959 [3] to become one of the first commercially successful transistorized computers.


The processor running at 208 kHz contained a 48-bit accumulator (A), a 48-bit mask register (Q), a 15-bit program counter (P), and six 15-bit index registers. Internal integer representation used ones' complement arithmetic. The most-significant three bits of the accu were converted to analog output, connected to a valve audio amplifier in the console to generate sound. The 24-bit instruction format had a six bit opcode field, three bits either for branch condition or index, and fifteen bits for immediate address operand or shift count. Memory consisted of 32K 48-bit words of magnetic core memory with a cycle time of 6.4 microseconds [4].

Chess Programs

Chess programs for the CDC 1604

See also

External Links


  1. CDC 1604 with console - The main computer weighed one ton and the console 1/2 a ton. The tapes weren’t light either. The console, like all consoles of the day, enabled anyone sitting at it to look at every state bit in the computer. The most unreliable part of the computer was the console typewriter - from A Seymour Cray Perspective by Gordon Bell, University of Minnesota, November 10, 1997, Slide 23 of 89
  2. A Seymour Cray Perspective by Gordon Bell, University of Minnesota, November 10, 1997
  3. CDC Introduces 1604 Computer - Event - Computing History
  4. CDC 1604 from Wikipedia

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