Arithmetic Processor 166 Instruction Manual, Volume 2

This document, "Arithmetic Processor 166 Instruction Manual, Volume 2," is an engineering manual primarily composed of detailed electrical diagrams and control logic for the Digital Equipment Corporation PDP-6 Arithmetic Processor 166. It covers a wide range of topics essential for understanding the processor's hardware implementation, including system block diagrams, instruction decoding, and various operational cycles (instruction, address, fetch, execute, store).

The manual provides specific diagrams for different instruction types, such as data transmission, compare, pushdown, jump, fixed-point, logical, floating-point, and IOT (Input-Output Transfer) instructions, along with their associated subroutines for tasks like exponent calculation, multiplication, normalization, and division. Furthermore, it details the control logic and connections for numerous registers and components, including the Instruction Register (IR), Accumulator (AC), Memory Buffer (MB), Multiplier Quotient (MQ), Shift Counter (SC), Floating Exponent (FE), Program Counter (PC), Memory Address (MA), and various Input/Output devices like paper tape readers, punches, teletypes, and card readers. The document also includes information on memory control, protection, and relocation.