IBM PS2 Model 70 Technical Reference (May 1988)

The IBM Personal System/2 Model 70 Technical Reference is IBM's 74-page model-specific interface reference for the PS/2 Model 70 (8570), First Edition, May 1988. It covers the Type 1 (16 MHz) and Type 2 (20 MHz) system boards, identified by model byte F8 and submodel 09 or 04 (Figure 1-1, p. 1-3). The preface says it is to be used with the PS/2 Hardware Interface Technical Reference and the PS/2 and PC BIOS Interface Technical Reference. The October 1990 edition is also hosted.

Contents

From the contents page (p. v):

• Section 1, System Overview (p. 1-1): description and model bytes, system board features, block diagram, I/O address map and specifications (p. 1-7), including physical specifications (Figure 1-7, p. 1-9) and acoustics.
• Section 2, Programmable Option Select (p. 2-1): POS address map, card selected feedback, system board enable/setup (hex 0094), POS registers 2 and 3 and adapter enable/setup (hex 0096).
• Section 3, System Board (p. 3-1): 80387 coprocessor, Micro Channel with matched-memory cycles, central arbiter, diskette drive and fixed disk connectors (p. 3-7), ROM and RAM with error recovery and memory subsystem control, system memory maps and memory connectors, real-time clock and CMOS RAM (p. 3-24), NMI, system control ports B and A, power-on password (p. 3-40) and hardware compatibility (p. 3-41).
• Index.

What this manual does not contain

It is a programming and interface reference: no FRU numbers, removal procedures, symptom index, schematics or component values. There is no power supply section; the October 1990 edition adds one. The 25 MHz Model 70 systems are not covered.

What it settles

Figure 1-7 (p. 1-9): 360 × 420 × 140 mm, 9.55 kg, heat output 220 W, input 90-137 V or 180-265 V at a maximum of 5.0 A or 3.0 A, and maximum allowable currents of 275 mA from the keyboard port and 300 mA from the auxiliary device port.

Pages that cite this document

• IBM PS/2 Model 70 cites it.
• IBM PS2 Model 70 Technical Reference (October 1990) and IBM PS2 Model 70 Hardware Maintenance Reference list it as related.

Download: IBM PS2 Model 70 Technical Reference May88.pdf