CDC 1604

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

=Architecture= 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.

=Chess Programs= Chess programs for the CDC 1604
 * Charly‎‎
 * Tell

=See also=
 * CDC 6600
 * CDC Cyber

=External Links=
 * CDC 1604 from Wikipedia
 * Index of bitsavers/pdf/cdc/1604
 * Real Machines with 24-bit and 48-bit words
 * Tag Archive | CDC 1604, HNF Blog (German)

=References= Up one Level