KE44-A CISP Technical Manual

The KE44-A Commercial Instruction Set Processor (CISP) is an optional module for the PDP-11/44 computer, designed to enhance performance for commercial data processing tasks such as COBOL, text editing, and word processing. This technical manual provides a comprehensive overview of the KE44-A, covering:

• General Description: The purpose, scope, and basic functionality of the CIS, including instruction suspension (interrupt) and microcode implementation.
• Interfacing: Details on the interface lines between the KE44-A and the KD11-Z CPU.
• Data Types: Extensive documentation on character and decimal string data types, including zoned, packed, and overpunch formats, as well as long integer representation.
• Theory of Operation: A detailed look at the internal components, including the 2901A microprocessor slicer, binary and BCD data paths, status bits, and microcode control fields.
• Microcode: A description of the control store, microword field mapping, and how to read the microcode listings.
• Installation & Maintenance: Instructions for module placement, diagnostic testing using the CZKEEA program, and using the ASCII programmer's console for maintenance.