PDP-8 Processor

This document, Chapter 2 and 3 of the PDP-8 manual, details the logical operation of the PDP-8 processor. It covers manual operations, programmed operations, and automatic operations, including data breaks. It provides comprehensive explanations of instruction execution, specifically memory reference instructions (AND, TAD, ISZ, DCA, JMS, JMP) and augmented instructions (IOT, OPR). The manual also explains processor logic, including timing signal generation, the instruction register, the major state generator, and program counter control. Additionally, it details the optional memory extension control, the KRO1 automatic restart option, and the Type 182 Extended Arithmetic Element (EAE).