Df32 Discless Logic Test, Minidisc

This document details the diagnostic program "Discless," created in 1968 for the PDP-8/1 computer system. The program is designed to test the logic and interface of the DF32 disc system without requiring the actual disc hardware to be spinning (or connected).

Key aspects of the document include:

• Purpose: To perform an incremental diagnostic test of the disc logic, including registers, status bits, shift operations, data breaks, and track selection.
• Requirements: A standard PDP-8/1 computer and an optional "light card" for verifying track selector functionality.
• Operational Procedures: The guide provides instructions on loading, starting addresses, and operator switch settings used to control tests and error handling.
• Error Handling: The document includes a comprehensive table of "Error Halts," which map address tags to expected versus actual conditions and suggest corrective hardware actions.
• Technical Details: The latter portion of the document contains the complete assembly language source code listing, including memory constants, routines for error output, maintenance loops, and flow charts illustrating the logic progression.

This manual serves as a maintenance and troubleshooting reference for technicians verifying the integrity of the DF32 interface circuitry.