PDP-11/20

This document is a comprehensive technical manual and master drawing list for the Digital Equipment Corporation PDP-11/20 computer system, primarily focusing on its KA11 Central Processor.

Issued in November 1970, the document serves as a detailed engineering reference, containing:

• High-Level Indexes: Master drawing lists for the entire PDP-11/20 system (including components like the Central Processor, Memory, Consoles, Teletypes, and Power Supplies) and specific sub-indexes for the KA11 Central Processor, detailing its constituent modules.
• Detailed Schematics & Parts Lists: In-depth electrical circuit diagrams, component placement layouts, and associated parts lists for numerous internal modules of the KA11 Central Processor, such as: Timing & States (M728), State Control (M727), Priority (M824), Register Control (M821), Registers (M225), Data Path Control (M820), Data Paths (M224), Bus Interface & IR (M725), IR Decode (M726), Codes Data (M823), Flag Control (M822), Bus & Console Control (M724), and Power Fail & Control (M825).
• Wiring Information: Detailed wire tables specifying connections, pin assignments, colors, and remarks for various assemblies.
• Physical Layout: Module utilization diagrams illustrating the physical placement of modules within the KA11, including notes on "casting spaces" (unused slots) and bus terminator usage.

The document is proprietary to Digital Equipment Corporation and outlines the detailed design and assembly of this early minicomputer system.