TC59 Random Exerciser Executive Routine

This document describes the TC59 Random Exerciser Executive Routine, a suite of utility and typeout subroutines designed for the PDP-9 computer. It operates in an open interrupt mode, providing essential functions such as handling standard PDP-9 processor interrupts, maintaining a 24-hour real-time clock, and managing system parameter input.

The routine requires a minimum PDP-9 configuration and utilizes most of the memory from address 0000 to 1777, with specific allocations for interrupt handling, the real-time clock, CAL handling, API error management, inter-program communication, and program storage.

Loading the routine involves a standard ABS binary tape procedure, starting a read-in from address 17720. During startup, which commences at address 00200, the operator is prompted to configure system parameters. These include selecting the processor power cycle (50 or 60 Hz), enabling or disabling the API option, and specifying the amount of memory to be initialized (8K, 16K, 24K, or 32K). The routine also requires a four-digit input for its 24-hour clock, which validates numeric entries. The frequency of time printouts can be adjusted via AC switch settings, from every five minutes to once per hour.

Hardware malfunctions detected by the routine generally result in processor halts at specific addresses, for which explanations are provided within the document. The routine was created on March 20, 1968, by Keith F. Nelson and is maintained by the Diagnostic Group.