Clock-Interrupt Test Program

This document describes the "Clock-Interrupt Test Program" for the POP-A computer, authored by Gordon Bell of DEC on November 6, 1962. The program is designed to test the operation of various hardware components—specifically the clock, interrupt system, paper tape reader, paper tape punch, and teleprinter—all within the interrupt mode. It also verifies specific instructions (like "fors") and the correct functioning of flags and I/O skip instructions.

The program starts at register "gorets," with the accumulator (AC) holding the test's running time in minutes and seconds. At pre-determined intervals:

• The paper tape reader reads a numeric sequence (0,1,2,...377,0...) every 30 seconds.
• The paper tape punch punches a numeric sequence (0,1,2,...377) every 30 seconds.
• The teleprinter prints a repetitive sequence (0,1,2,...37) every 60 seconds for visual inspection.
• Striking the keyboard adds one second to the running time.

The document also details control switches that can disable reading, punching, or printing, and provides an extensive list of error indications. These errors point to specific issues with various flags (reader, punch, teleprinter, keyboard, clock), incorrect wiring, or general program interrupt status.