PDP-11 Bus Technical Specifications

This document contains interoffice memorandums detailing the PDP-11 I/O bus, which serves as the primary communication path for system units, handling data transfers, interrupts, and priority determination. It defines the thirty bi-directional signals that compose the bus, including data, control, and synchronization lines. The document explains bus arbitration, signal definitions, and the specific procedures for various bus transactions such as data input, data output, direct transfer, and priority requests.