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IBM PS2 Model 70 Technical Reference (October 1990): Difference between revisions

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P4 verification: real documentation page - title as printed, part/form number, edition, contents, honest gaps, what it settles, cross-links
Correct slot limits: 32-bit connectors allow 2.0 A at +5 V (Figure 1-13), not 1.6 A; add the four board types; remove wiki self-reference and 'last edition' claim
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The '''IBM Personal System/2 Model 70 386 Technical Reference''', '''Fourth Edition (October 1990)''', is IBM's 96-page model-specific hardware and software interface reference for the [[IBM PS/2 Model 70|PS/2 Model 70]] (8570). It is the last of four editions; the [[IBM PS2 Model 70 Technical Reference (May 1988)|May 1988 first edition]] is also hosted here.
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The '''IBM Personal System/2 Model 70 Technical Reference''' is IBM's 96-page model-specific interface reference for the [[IBM PS/2 Model 70|PS/2 Model 70]] (8570), Fourth Edition, October 1990. It covers four system boards, all with model byte F8 (Figure 1-1): Type 1 (submodel 09, 16 MHz 80386), Type 2 (04, 20 MHz 80386), Type 3 (0D, 25 MHz 80386) and Type 4 (1B, 25 MHz 80486). Vertical bars mark changes; the [[IBM PS2 Model 70 Technical Reference (May 1988)|May 1988 first edition]], which covers only Types 1 and 2, is also hosted.


== What it contains ==
== Contents ==
From the contents page (p. vii):
* Section 1, System Overview (p. 1-1): description and model bytes, system board features (p. 1-4), I/O address map (p. 1-8), specifications (p. 1-9) including physical specifications (Figure 1-10), and a power supply section (pp. 1-15 to 1-16).
* Section 2, Programmable Option Select (p. 2-1): POS address map, card selected feedback, system board enable/setup, POS register 2, POS register 3 for Types 1 and 2 and for Types 3 and 4, POS register 4 (Types 3 and 4), memory presence detect and adapter enable/setup.
* Section 3, System Board (p. 3-1): 80387, Micro Channel implementation, exception reporting and matched memory, central arbiter, diskette drive and fixed disk connectors (p. 3-9), ROM and RAM, system and non-system memory, memory caching (p. 3-16), error recovery, memory subsystem control, memory maps and connectors, and the real-time clock and CMOS RAM (p. 3-31).


* '''Section 1, System Overview''' &mdash; model and submodel bytes, system board features and block diagram, the I/O address map, performance specifications by planar type, physical specifications, and the power supply section with component maximum currents and Micro Channel load currents.
== What this manual does not contain ==
* '''Section 2, Programmable Option Select''' &mdash; the POS address map and the system board setup registers.
It is a programming and interface reference: no FRU numbers, removal procedures, symptom index, schematics or component values.
* '''Section 3, System Board''' &mdash; Micro Channel implementation, the central arbiter, the processor complex and cache, the memory subsystem, the RT/CMOS RAM map and real-time clock bytes, system control ports A and B, and the power-on password.


Physical specifications: 360&nbsp;mm wide, 420&nbsp;mm deep, 140&nbsp;mm high, 9.55&nbsp;kg, heat output 215&nbsp;W (735 BTU/hour). The May 1988 first edition gives 220&nbsp;W for the same machine.
== What it settles ==
 
From the power supply section (pp. 1-15 to 1-16):
== What it does not contain ==
* The system-board voltages are +5, +12 and −12 V; the drives receive +5 and +12 V.
 
* Maximum current is 300 mA for the auxiliary device and 275 mA for the keyboard, at +5 V (Figure 1-12).
This is a '''programming and interface reference, not a service manual'''. There are no FRU part numbers, no removal and replacement procedures, no symptom-to-FRU index and no component values &mdash; IBM put those in the model's Hardware Maintenance Reference and Hardware Maintenance Service pamphlets. There are no schematics; the planar is described as a block diagram and a set of register and connector tables.
* Channel connector load limits (Figure 1-13) differ between the 16-bit and 32-bit slots:


It is also '''not self-contained'''. IBM split the PS/2 Technical Reference library into volumes, and this one carries only the model-specific part. Anything common to the family &mdash; Micro Channel architecture, the serial and parallel port controllers, the instruction sets, the keyboard scan codes &mdash; is in the ''Hardware Interface Technical Reference'' volumes, and BIOS in the ''BIOS Interface Technical Reference''.
{| class="wikitable styled-table"
! Supply !! 16-bit connector !! 32-bit connector
|-
| +5 V || 1.6 A || 2.0 A
|-
| +12 V || 0.175 A || 0.175 A
|-
| −12 V || 0.040 A || 0.040 A
|}
* A short on any output, or an internal overvoltage before any output exceeds 130 % of nominal, latches all outputs off until the fault is removed and the power switch has been off for at least ten seconds. The outputs track within 50 ms of each other at power-on.


== What it settles ==
The physical specifications (Figure 1-10) give 360 × 420 × 140 mm, 9.55 kg, heat output 215 W (735 BTU/hour), automatic range selection between 90-137 V and 180-265 V, and 0.13-0.36 kVA input. The May 1988 edition gives 220 W.


* '''The system board has no &minus;5 V rail.''' Section 1 states plainly that "the system-board voltages are +5 Vdc, +12 Vdc, and &minus;12 Vdc" and that the drive voltages are +5 Vdc and +12 Vdc. Several repair pages on this wiki have had to correct an invented &minus;5 V rail on Micro Channel PS/2 models; this is the primary source that settles it. Note that the ISA-bus [[IBM PS/2 Model 25|Model 25]] and [[IBM PS/2 Model 30|Model 30]] '''do''' have a &minus;5 V rail &mdash; the distinction is Micro Channel versus ISA, not PS/2 versus PC.
== Pages that cite this document ==
* '''Micro Channel per-slot load limits''' &mdash; 1.6 A at +5.0 V, 0.175 A at +12.0 V and 0.040 A at &minus;12.0 V per connector.
* [[IBM PS/2 Model 70]] cites it.
* '''Power supply protection behaviour''' &mdash; a short between any two outputs, or an internal overvoltage, latches every DC output off before any output exceeds 130&nbsp;% of nominal, and the supply only restarts after the fault is cleared '''and''' the switch has been off for at least ten seconds. Outputs track within 50&nbsp;ms of each other at power-on.
* [[IBM PS2 Model 70 Technical Reference (May 1988)]] and [[IBM PS2 Model 70 Hardware Maintenance Reference]] list it as related.


<pdf> File:IBM PS2 Model 70 Technical Reference Oct90.pdf </pdf>
<pdf> File:IBM PS2 Model 70 Technical Reference Oct90.pdf </pdf>


Download it here: [[:File:IBM PS2 Model 70 Technical Reference Oct90.pdf|IBM PS2 Model 70 Technical Reference Oct90.pdf]]
Download: [[:File:IBM PS2 Model 70 Technical Reference Oct90.pdf|IBM PS2 Model 70 Technical Reference Oct90.pdf]]
 
== Related pages ==
 
* [[IBM PS/2 Model 70]] &middot; [[IBM PS/2 Model 70 Maintenance Guide]] &middot; [[IBM PS/2 Model 70 Troubleshooting Guide]] &middot; [[IBM PS/2 Model 70 Capacitor Replacement Guide]]
* [[IBM PS2 Model 70 Technical Reference (May 1988)]] &middot; [[IBM PS2 Model 70 Hardware Maintenance Reference]]
* [[IBM PS2 Model P70 Technical Reference (April 1989)]] &mdash; the portable sibling


[[Category:IBM Service Manuals]]
[[Category:IBM Service Manuals]]
[[Category:Service Manuals]]
[[Category:Service Manuals]]
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