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IBM PS2 Model 30 Technical Reference (January 1987)

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The IBM Personal System/2 Model 30 Technical Reference, January 1987, is IBM's 348-page standalone technical reference for the PS/2 Model 30 (8530), the 8086 desktop machine with an ISA bus. Like the Model 25 book it is written in the pre-1988 one-volume format and carries the power supply, keyboard and instruction-set chapters in full.

What it contains

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  • Section 1, System Board — the 8086 and its support gate arrays, DMA, interrupts, memory and ROM, the I/O channel with connector pinouts and timings, the video subsystem with its register set and display formats, the diskette drive interface, the serial and parallel ports, connectors and specifications.
  • Section 2, Coprocessor — the 8087.
  • Section 3, Power Supply — input requirements, DC outputs, overvoltage/overcurrent protection, the power good signal and the connector pin assignments.
  • Section 4, Keyboard; Section 5, System BIOS; Section 6, Instruction Set; Section 7, Characters and Keystrokes.

What it does not contain

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No FRU part numbers, no removal procedures, no symptom-to-FRU index, no schematics and no component values. For a Model 30 drawing with designators and values on it, see IBM PS2 Model 30 Schematics — eight third-party sheets, not an IBM publication.

What it settles

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  • The Model 30 has a −5 V rail. Figure 3-2 gives +5 Vdc 1.5–9.0 A (+5 % / −4 %), −5 Vdc 0.0–0.11 A (+10 % / −8 %), +12 Vdc 0.0–1.8 A (+5 % / −4 %) and −12 Vdc 0.0–0.30 A (+10 % / −9 %). The "PS/2 machines have no −5 V rail" rule applies to the Micro Channel models, not to the 8530 or the 8525.
  • Mains input: 110 Vac nominal, 90–137 Vac, 2.0 A maximum; or 220 Vac nominal, 180–265 Vac, 1.0 A.
  • Minimum undervoltage sense levels (Figure 3-3), read from the printed page rather than OCR: +5 Vdc at +4.5 V, −5 Vdc at −4.3 V, +12 Vdc at +10.8 V and −12 Vdc at −10.2 V. These are the figures quoted on IBM PS/2 Model 30 Maintenance Guide.
  • Power good: TTL, active 2.4–5.25 Vdc, inactive 0.0–0.4 Vdc, turn-on delay at least 100 ms and no more than 500 ms, sinks 2 mA or sources 100 µA.
  • It is also the source that settles the real-time clock question on the 8086 Model 30 — the machine does have one, and it is documented in this book rather than being an option.

Download it here: IBM PS2 Model 30 Technical Reference Jan87.pdf

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