Memory Address Test

This document serves as the technical documentation for the Memory Address Test, a diagnostic program designed for the standard PDP-8 computer. Created in March 1968, the program is intended to verify proper memory address selection by systematically writing to and reading from memory locations.

Key features include:

• Versions: The diagnostic comes in two versions—a "Low" version (occupying locations 0000–0222) and a "High" version (occupying locations 7400–7575).
• Operation: The program operates in four phases: sequentially loading memory in a forward direction, reading and checking those locations, and then repeating the process in reverse. During loading, each memory location is set to match its own address.
• Error Handling: If an error occurs, the program provides a printout indicating the address containing the wrong data and what that data actually is. Users can configure the system to halt on error for troubleshooting purposes.
• Scope: The document includes the full assembly code for both versions, detailed loading and starting procedures, and comprehensive symbol tables for debugging.