IBM PS2 Model 80 Technical Reference (April 1987)
The IBM Personal System/2 Model 80 Technical Reference is IBM's 612-page technical reference for the PS/2 Model 80, First Edition, April 1987. The preface says it covers the 8580-041 and -071. It is a single volume: the Micro Channel architecture, power supply, keyboard, instruction sets and compatibility notes that later editions leave to the Hardware Interface Technical Reference are all in this book.
Contents
[edit | edit source]From the preface and contents pages:
- Section 1, System Description (p. 1-1): system board features, I/O address map and specifications (p. 1-8).
- Section 2, Micro Channel Architecture (p. 2-1): channel definition and signals for the 16-bit, 32-bit, matched-memory and auxiliary video extension sections, connectors, Programmable Option Select and configuration utilities (p. 2-29), level-sensitive interrupt sharing (p. 2-63), arbitration, timing and adapter design.
- Section 3, System Board (p. 3-1): microprocessor, math coprocessor, interrupts, system timers, password and audio subsystem.
- Section 4, System Board I/O Controllers (p. 4-1): keyboard/auxiliary device controller, video subsystem, diskette drive controller, serial and parallel ports and miscellaneous system ports.
- Section 5, Power Supply (p. 5-1): inputs, input protection, ground leakage, outputs, output protection, voltage sequencing, no-load operation, auto restart, power good and connectors.
- Section 6, Keyboard (p. 6-1): fifteen national layouts, power-on routine and basic assurance test, commands, scan codes, cables and specifications.
- Section 7, Instruction Sets; Section 8, Characters and Keystrokes; Section 9, Compatibility; glossary, bibliography and index.
What this manual does not contain
[edit | edit source]There are no FRU numbers, removal procedures, symptom-to-FRU index, schematics or component values; the system board appears as block diagrams, register tables and connector tables. Third-party drawings of one Model 80 board are at IBM PS2 Model 80 Schematics.
What it settles
[edit | edit source]From Section 5 (pp. 5-3 to 5-7):
- The supply selects its input range automatically: 100-125 V nominal (90-137 V) at 5 A, or 200-240 V (180-265 V) at 3 A, 50-60 Hz ±3 Hz. The input is fused, and ground leakage does not exceed 500 µA.
- It has three outputs, +5, +12 and −12 V, with minimum sense levels of +4.5, +10.8 and −10.2 V (Figure 5-2).
- A short on any output, or an internal overvoltage before any output exceeds 130 % of nominal, latches all outputs off. The supply restarts after the fault is removed and the power switch has been off for at least one second; the October 1990 technical references for other models give ten seconds. Outputs track within 50 ms at power-on. The supply runs with no load, with ±25 % regulation and Power Good in either state, and restarts by itself after a mains outage.
- Power Good sources 100 µA and sinks 1 mA, comes up 100-500 ms after +5 V reaches its sense level, and stays active for at least 10 ms after mains is removed.
- The 15-pin system board connector (Figure 5-4): +5 V on pins 1, 4, 7, 10 and 13; signal ground on 2, 5, 6, 8, 11 and 14; +12 V on pin 3; −12 V on pin 9; Power Good on pin 12; System Status on pin 15, the line that lights the yellow fixed disk LED under control of bits 6 and 7 of System Control Port A (hex 0092). Two 4-pin connectors feed the fixed disk positions: +12 V on pin 1, ground on 2 and 3, +5 V on pin 4.
Pages that cite this document
[edit | edit source]- IBM PS/2 Model 80, IBM PS/2 Model 80 Maintenance Guide and IBM PS/2 Model 80 Troubleshooting Guide cite it for the power supply.
- IBM PS2 Model 80 Technical Reference (May 1988), IBM PS2 Model 80 Technical Reference (October 1990) and IBM PS2 Model 80 Schematics list it as related.