Pdp-8 Processor Replacement

This document is a data sheet for the CPU 8, a processor replacement for the DEC PDP-8 created by Computer Extension Systems, Inc. (CESI). The CPU 8 is fully hardware and software compatible with DEC HEX-wide OMNIBUS backplanes and allows for the easy upgrade of KK8A CPUs to the higher-speed KK8E standard.

Key Technical Specifications:

• Architecture: 12-bit word length, single address, parallel transfer processor supporting MOS or CORE memory.
• Performance: Features a 1.2 micro-second cycle time (upgradable to 900 nano-seconds) and includes 8 auto-index registers per 4K memory field.
• I/O and Instruction Set: Supports programmed data transfer, interrupt system transfer, and direct memory access, with instruction execution times ranging from 1.2 to 4.0 micro-seconds.
• Physical: Designed as a 21.6cm x 40cm hex board requiring +5V and -12V DC power.

The document also notes that the unit comes with an unconditional one-year warranty.