Rainbow Pocket

This document is a Pocket Service Guide providing Field Service personnel with practical information for the Digital Equipment Corporation Rainbow computer. It covers essential topics for maintenance, including an overview of the computer's physical characteristics and system configurations (PC100A, PC100A with Winchester upgrade, and PC100B). The guide details Set-Up features, their functions, and how to modify them, as well as comprehensive procedures for diagnostic testing and troubleshooting error messages. It also includes step-by-step instructions for making monitor adjustments and for the removal and replacement of various Field Replaceable Units (FRUs) such as system modules, drives, memory boards, and option boards. Appendices offer dedicated testing procedures for specific components like memory, extended communications, color/graphics, and Winchester (hard) disk options, along with a complete parts list. The Rainbow computer is described as utilizing both Z80A and 8088 processors to support CP/M-80, CP/M-86/80, and MS-DOS operating systems.