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A Golden Anniversary for a Golden Computer Brian L. Stuart Drexel University

Explore the origins, architecture, and impact of the PDP-8, a groundbreaking computer introduced in 1963. With a 6μS memory cycle time and 12-bit word, it served as a front end for analog-to-digital converters and could have up to 32KW of memory. Learn about the evolution of the PDP-8, from the PDP-5 to the Straight 8 and various re-implementations using flip chip modules and TTL ICs. Discover the significance of the PDP-8, its instruction set, and its impact on early microcomputer designs.

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A Golden Anniversary for a Golden Computer Brian L. Stuart Drexel University

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  1. A Golden Anniversary for a Golden Computer Brian L. Stuart Drexel University

  2. Foxboro Corporation and process control CDC 160 by Seymour Cray influenced MIT LINC by Wes Clark influenced DEC DC-12 marketed as PDP-5 Origins of the PDP-8

  3. Introduced in 1963 6 μS Memory cycle time 12-bit word To match analog to digital converters Front end for PDP-4 Up to 32KW of memory Built with DEC System Modules PDP-5

  4. PDP-5

  5. Introduced in 1964 Faster than System Modules 2 7/16 in by 5 in Roughly equivalent to later SSI logic ICs Flip Chip Modules

  6. Flip Chip Modules

  7. Re-implement PDP-5 architecture: Move program counter to register Use flip chip modules Same I/O devices Faster 1.6 μS memory From PDP-5 to PDP-8

  8. The Straight 8

  9. PDP-8/S • Bit serial implementation • Less expensive and slower

  10. PDP-8/I • Re-implementation using TTL ICs

  11. PDP-8/L • Low cost packaging of PDP-8/I design

  12. PDP-8/E,F,M • Reimplementation using larger boards • Lower cost • OMNIBUS

  13. PDP-8/A • Larger OMNIBUS boards • Keypad front panel

  14. PDP-8 Register Architecture • Single accumulator • Single link bit (carry bit) • Program counter • MQ register • No Stack pointer

  15. PDP-8 Memory Architecture • 32KW maximum memory • 8-4KW fields • 32-128 word pages per field • Addressing: • Current page direct • Zero page direct • Indirect • Auto-increment indirect

  16. PDP-8 Instruction Set • 8 Major Instructions • AND: bitwise and • TAD: 2's complement add • ISZ: increment and skip if zero • DCA: deposit and clear accumulator • JMS: jump to subroutine • JMP : jump • IOT: in-out transfer • OPR: operate

  17. PDP-8/M Restoration

  18. PDP-8/M Restoration

  19. PDP-8/M Restoration

  20. PDP-8 Impact • Sub $20K • Conventional power • Table-top size • Multiple languages and peripherals • Bus structure → All point to early microcomputer designs

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