Ax08 Diagnostic

Summary: This document provides technical documentation and the assembly source code for the "AX08 Diagnostic" (Product Code: MAINDEC-81-D6AB-D), dated October 8, 1968. The diagnostic program is designed to test the hardware logic, display functionality, and analog-to-digital (A/D) converter calibration for the AX08 option on a PDP-8 computer.

The program consists of three main testing sections:

1. Instruction Test: A hardware logic test that verifies registers, flip-flops, flags, interrupt logic, and timing components.
2. Display Test: Validates the display logic and scope performance by allowing the operator to select patterns and intensities via the switch register.
3. A/D Converter Calibration: Checks the A/D converter and its multiplexer channels by recording voltages, storing them in a buffer, and displaying the results on an oscilloscope to check for noise, drift, and accuracy.

The document includes detailed operating procedures, instructions for error handling and diagnostics, a comprehensive list of error codes with corresponding corrective actions, flow charts, and the complete source code listing for the diagnostic software.