Digital PDFs

Order Number: AF-E009A-A0

/ Incoming

This document contains a comprehensive collection of 442 pages (indexed through 221 pages in the provided excerpt) of Diagnostic Engineering Change Orders (ECO) and Patch Orders issued by the Digital Equipment Corporation between 1970 and 1981.

Key Content Overview:

Purpose: These forms document formal engineering changes, updates, or patches made to various diagnostic software packages used for testing and maintaining DEC hardware components.
Scope of Affected Hardware: The document covers a wide range of peripheral devices and hardware subsystems, including:
- Storage Devices: RK8/RK8E/RK05/RK08 disk systems, TC01/TC58 dectape, and RX01/RX02 floppy disk systems.
- Processing & Memory: PDP-8, PDP-8I, PDP-8E, PDP-8A, PDP-8S, and various memory expansion/parity boards.
- Terminals & Printers: LA36, LA180, LQP-8, and VT50/VT78 terminal series.
- Other Subsystems: Real-time clocks (KW8I), card readers, tape readers, and specialized interface modules (e.g., DB8-E, DR8-EA).
Common Administrative Data: Each entry typically includes:
- Diagnostic Package Code: The specific software package identification (e.g., MD-08-D0400-B0).
- Author/Engineer Details: Personnel responsible for the diagnostic maintenance.
- Problem Description: The specific technical issue (e.g., timing problems, incorrect printouts, support for newer hardware revisions).
- Solution/Correction: The technical resolution, which often involved updating software code, adjusting timing constants, or issuing patches for specific memory addresses.
Evolution of Hardware Support: The sequence of documents highlights DEC’s iterative process in maintaining diagnostics as hardware evolved (e.g., adding support for "8-A" processors to existing diagnostics, or adapting software for different terminal series like VT78).

In summary, this is a technical record-keeping file used for the version control and lifecycle management of Digital Equipment Corporation's field service and hardware diagnostic tools.