MF20 schem May78

This document is an engineering index and set of specifications for the MOS MEMORY MF20 system, detailing its modules, architecture, and interconnections.

The summary of the document's content includes:

1. System Overview & Module Identification:

   • A comprehensive list of modules categorized by function, such as:
     • MOS Memory Components: Write Path (M8574), Syndrome (M8575, for error detection/correction), MOS Control (M8576), Address and Time (M8577), and MOS Storage (M8579).
     • Bus Interfaces: XBUS Terminators (5412855-0, M8581), XBUS Cable Board (M8572-0), and Dual/XBUS Translators (M8580/M8581).
     • Timing & Control: Master Oscillator (5412851-0), Address Timer, Clock Select Logic, Cycle Control, and Diagnostic Control.
     • Power & Diagnostics: Power Supply components, Power Distribution, and various diagnostic functions.

2. Architectural Details:

   • Memory Organization: A "MF20 Module Utilization List" and "MOS Storage" descriptions detail how memory is organized into "Groups" (e.g., Group 0 is First 256K words, Group 1 is Second 256K, Group 2 is Third 256K), and how specific bit fields are allocated across M8579 modules.
   • Physical Layout: "Module Utilization Lists" and "Variation Module Location Charts" describe the physical placement of modules in various slots, and provide notes on cable connections (e.g., SBUS, EIC BUS, XBUS).
   • Operational Flow: Block diagrams and flow charts for Read, Refresh, Write, and Diagnostic cycles, along with timing diagrams, illustrate the system's operational sequences.

3. Detailed Component Documentation:

   • Specific drawing indexes and associated documentation (parts lists, drill & etch drawings, P.C. design data base) are provided for key components such as:
     • XBUS Terminator
     • Master Oscillator (including detailed schematics for Select Logic and Power Supply)
     • XBUS Cable Board

In essence, the document serves as a complete technical reference, outlining the functional blocks, physical layout, electrical schematics, and operational sequences for the MOS MEMORY MF20 system.