PDP-8 Instruction

This document describes the MAINDEC 08-D02B-D instruction test for the PDP-8 computer. It covers the testing of 2s complement add (TAD) and rotate logic (RAL, RTL, RAR, RTR). The test uses pseudo-random numbers to verify these operations, with switch settings allowing for control over the testing process, including error handling, scope mode, and printing of results. The document provides instructions for loading the test, setting switches for different test scenarios, interpreting error printouts, and guidelines for recovery after an error is detected. It is intended to be run following a successful execution of the Instruction Test 2A to ensure the reliability of the system.