GT40 ROM Bootstrap Test

This document provides a detailed description and operating instructions for the MAINDEC-11-DDGTD-B diagnostic program. It is designed for hardware debugging and maintenance of the GT40 display processor's ROM bootstrap loader (versions 1 or 2). The software includes logic tests (PRG0), ROM data dumps (PRG1), and a single ROM address read data loop (PRG2). The documentation covers hardware requirements, memory usage, loading/starting procedures, switch settings, error handling (noting the program halts on errors and lacks error reporting facilities), and execution timing for each test. It also includes partial source code listings and register definitions.