A to D Test

This document is a technical manual for the "A to D Test," a diagnostic program designed for the PDP-12 computer system. Created on October 24, 1969, the program is used to test and calibrate analog-to-digital (A-D) converter hardware, including preamplifiers, knob continuity, and A-D monotonicity. It also supports testing for up to sixteen additional A-D channels via the AM12-AG12 multiplexer extension.

The manual outlines the necessary hardware requirements—specifically a PDP-12 with A-D, a VR12 display, and an ASR-33 teletype—and provides step-by-step instructions for loading the program using a binary loader. It details procedures for initializing the test, setting display parameters using console switches, and interpreting the output on the VR12 display. Notably, the program does not contain specific error routines; if difficulties arise during operation, users are instructed to verify the A-D control, multiplexer, potentiometers, or preamplifiers. The latter half of the document provides the full assembly source code for the diagnostic program.