IBM PS2 Model 95 XP 486 Technical Reference (October 1990)

The IBM Personal System/2 Model 95 XP 486 Technical Reference is IBM's 92-page model-specific interface reference for the PS/2 Model 95 XP 486 (8595), a floor-standing 486 Micro Channel computer, First Edition, October 1990. Like the Model 90 XP 486 book it has a fourth section on the processor complex.

Contents

From the contents pages:

• Section 1, System Overview (p. 1-1): description, system board devices and features, I/O address map, Micro Channel compatibility (p. 1-4), specifications (p. 1-6), and power supply (pp. 1-8 to 1-10): outputs, output protection, voltage sequencing and connectors.
• Section 2, Programmable Option Select (p. 2-1): POS address map, card selected feedback, system board POS registers 2 to 5, diskette drive POS register, adapter enable/setup (p. 2-10) and selectable boot sequence (p. 2-11).
• Section 3, System Board: connectors, real-time clock and CMOS RAM, system ports and power-on password.
• Section 4, Processor Complex (p. 4-1): processor complex types, I/O address map, optional cache, central arbiter and its programming, memory subsystem with presence detect and memory controller registers, processor cache address map and ROM.
• 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.

What it settles

From the power supply section (pp. 1-8 to 1-10):

• The input range is selected by a switch near the power cord. The system-board voltages are +5, +12 and −12 V; the internal drives receive +5 and +12 V.
• Maximum currents (Figure 1-5): 2.5 A at +12 V and 1.5 A at +5 V per fixed disk supply connector, 7.5 A and 4.6 A in total for all fixed disk drives; auxiliary device 300 mA and keyboard 275 mA.
• Each Micro Channel adapter connector may draw 2.0 A at +5 V, 0.175 A at +12 V and 0.040 A at −12 V (Figure 1-6).
• 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. Outputs track within 50 ms at power-on.
• Three 4-pin internal connectors carry +12 V on pin 1, DC return on pins 2 and 3, +5 V on pin 4 (Figure 1-7).

The physical specifications (Figure 1-3, p. 1-6) give 203 × 508 × 501 mm, 22-30 kg, heat output 515 W (1757 BTU/hour), input 90-137 V or 180-265 V at a maximum of 9.2 A or 4.6 A, and 0.18-0.78 kVA.

Pages that cite this document

• IBM PS2 Model 90 XP 486 Technical Reference (October 1990) and IBM PS2 Models 95XP486 90XP486 Fundamentals list it as related.

Download: IBM PS2 Model 95 XP 486 Technical Reference Oct90.pdf