MP00019 1104 EngrDrws Feb78

The provided document contains two distinct sets of engineering information from Digital Equipment Corporation:

1. Parity Module (DCS M7850-0-1, Sheets 1-3): This section details an electronic parity module.

   • Content: It includes circuit schematics, a component layout (sheet 1), and a comprehensive parts list.
   • Functionality: The module is designed for address decoding (specifically for the CSR register address range 772100-772136, configurable via W1-W4 jumpers), bus interfacing (A-bus, D-bus), clocking, 8-bit parity generation, and error detection.
   • Components: It primarily uses standard TTL/CMOS integrated circuits (74xx and 8xxx series), along with resistors, capacitors, diodes, and various connectors/jumpers.
   • Notes: General specifications for resistors (1/4W, 5%) and capacitors (100V, 20%) are provided, along with specific jumper control operations and an IC pin location guide.

2. 32K SPC Memory/Electronics Parts List (D-UA-5412149-0-0 & G657-0-DBP, Sheets 1-5, though it spans 5 pages in total): This is a multi-page, detailed parts list for a 32K SPC Memory or associated electronics system.

   • Content: It enumerates a wide array of electronic components and some mechanical hardware.
   • Components: The list includes various capacitors (e.g., 1000 PF, 0.01 UF, 0.47 UF, 8 UF), resistors (many types with detailed wattage, tolerance, and PPM specs), diodes, transistors, transformers, delay lines, and a diverse range of integrated circuits. ICs listed include Quad Core Drivers, NAND gates, Latches, One Shots, Adders, Line Drivers, Bus Receivers/Transceivers, Op Amps, and Core Memory Drivers. It also lists connectors, sockets, fuses, switches, handles, nuts, screws, eyelets, and wiring.
   • Notes: Component substitution notes are present, indicating interchangeability for certain capacitors.