Instruction Test 1

This document serves as the technical manual and diagnostic program listing for testing the AND, TAD, and OPERATE instructions on the PDP-8I computer.

Key Information:

• Purpose: To verify the functional integrity of specific instruction sets (AND, TAD, and OPERATE) on the PDP-8I.
• Requirements: A PDP-8I system with a Teletype. The program occupies memory locations 0000–4354.

• Operating Instructions:

  • Load the program using the standard Binary Loader.
  • Set the Switch Register (SR) to 7777, set the Memory Address (MA) to 0144, and push START.
  • The program will halt at MA=146; if the Accumulator (AC) is not 0000, an error has occurred.

• Testing Sequence: The program sequentially tests individual operate instructions (excluding rotates), then tests the TAD instruction, rotate functions, Group 1 and Group 2 operate instruction combinations, and finally the AND instruction.

• Error Recovery: If a test fails, the operator can replace the HLT instruction with a JMP instruction to loop on the specific test causing the error.
• Additional Notes: The program runs approximately 13 loops per second and rings the Teletype bell after every 128 loops. The document includes a complete source code listing and a symbol table.