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P4 verification: real documentation page - title as printed, part/form number, edition, contents, honest gaps, what it settles, cross-links
Full contents with page numbers (old list stopped at chapter 4); add battery, supply and IML details from 4.5, 4.8, 12.11 and App. D; remove page self-reference and 'settles' claims about slot extensions not in 4.4
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'''Personal System/2 Models 95 XP 486, 90 XP 486, 55 LS and P75 486 Fundamentals''', document number '''GG24-3616-00''', Release 1.0, First Edition '''October 1990'''. IBM International Technical Support. 200 pages.
'''Personal System/2 Models 95 XP 486, 90 XP 486, 55 LS and P75 486 Fundamentals''' is an IBM International Technical Support Center Redbook, document number GG24-3616-00, Release 1.0, First Edition (October 1990). It applies to the PS/2 systems and options announced in the fourth quarter of 1990: the Model 90 XP 486, Model 95 XP 486, Model 55 SX LS and Model P75 486. The abstract gives 176 pages; the PDF has 200. It was written as reference material for IBM customers and systems engineers, not as a service manual.


Two corrections to this page's title. It is an '''IBM Redbook''', not a service manual; and it covers '''four''' machines, not two — the Model 90 XP 486, the Model 95 XP 486, the '''Model 55 LS''' and the '''Model P75 486''', all announced in the fourth quarter of 1990.
== Contents ==


== What it contains ==
Page numbers are the book's own.


* '''1.0 Introduction''' and '''2.0 Product Positioning''' — where each of the four machines sits, including the Model 55 LS (2.2) and the P75 486 (2.3).
{| class="wikitable" style="width:80%;"
* '''3.0 General System Description''' — system overviews and the model lists for the 90 XP 486 and 95 XP 486.
! Part !! Chapters !! Page
* '''4.0 System Details and Planar Functions''' — physical specifications for each machine, operating system support and total system memory, '''Micro Channel slot layout (4.4)''', '''battery and CMOS RAM (4.5)''', keyboard and mouse ports, '''security including SCSI security (4.7)''', and '''power supply (4.8)''' with a section for the 8590.
|-
* New features and options announced with the machines.
| Introduction || 1.0 Introduction; 2.0 Product positioning (90/95 XP 486 p. 3, 55 LS p. 4, P75 486 p. 4) || 1
|-
| Models 90 XP 486 and 95 XP 486 || 3.0 General system description; 4.0 System details and planar functions (physical specifications, operating system support, Micro Channel slot layout 4.4, battery and CMOS RAM 4.5, keyboard and mouse ports, security and SCSI security 4.7, power supply 4.8, LED display, serial and parallel ports, DMA); 5.0 Processor adapter and 256 KB cache option; 6.0 Memory subsystem; 7.0 Initial microcode load, POST and the system partition; 8.0 DASD; 9.0 XGA subsystems || 5
|-
| Model 55 LS || 10.0 Hardware (power supply, memory, riser card, token-ring and Ethernet adapters, security, DASD); 11.0 Installation, including remote IPL || 99
|-
| Model P75 486 || 12.0 System overview, models, physical specifications, block diagram, memory, Micro Channel and SCSI, plasma display subsystem, display capability, expansion, power supply, keyboard || 117
|-
| Appendices || A Micro Channel (137); B Antialiased fonts (141); C Programming the XGA (149); D IML error codes (157); E Announcement summary, October/November 1990 (159); F Remote IPL reference (163) || 137
|}


== What it does not contain ==
== Figures a repairer can use ==


No FRU numbers, no removal procedures, no symptom-to-FRU index, no schematics and no component values. For those, use the model technical references and the hardware maintenance pamphlets.
* Battery (4.5): the 90 XP 486 and 95 XP 486 use a flat 3 V coin cell for the real-time clock (64 bytes of non-volatile RAM, holding setup data such as the password) and a separate 8 KB CMOS RAM that holds the configuration. IBM gave a life expectancy of 7 to 10 years depending on use.
* Power supplies (4.8): the 8590 has a 194 W auto-sensing supply (90-137 V or 180-265 V AC) and an electrical push-on, push-off power switch at the front; the 8595 has a 329 W supply whose input range must be set by switch.
* P75 486 (12.11, 12.13): auto-sensing supply for 100-240 V at 50/60 Hz; the keyboard is the same as the P70's.
* IML error codes (Appendix D) for the machines that load their POST and BIOS from the system partition.


== What it settles ==
== What this document does not contain ==


'''Section 4.5, battery and CMOS RAM''', is the part a repairer wants: it is IBM's own description of how the 90/95 keep configuration, which is the starting point for a machine that forgets its settings. '''Section 4.4, the Micro Channel slot layout''', settles which slots on these planars carry which extensions — the thing that decides whether a given adapter will work in a given slot.
It has no FRU numbers, removal procedures, Symptom-to-FRU index, schematics or component values. For register-level detail it refers to the model technical references and the ''Hardware Interface Technical Reference''.


<pdf> File:IBM PS2 Models 95XP486 90XP486 Fundamentals.pdf </pdf>
<pdf> File:IBM PS2 Models 95XP486 90XP486 Fundamentals.pdf </pdf>


Download it here: [[:File:IBM PS2 Models 95XP486 90XP486 Fundamentals.pdf|IBM PS2 Models 95XP486 90XP486 Fundamentals.pdf]]
Download: [[:File:IBM PS2 Models 95XP486 90XP486 Fundamentals.pdf|IBM PS2 Models 95XP486 90XP486 Fundamentals.pdf]]


== Related pages ==
== Related pages ==


* [[IBM PS2 Model 90 XP 486 Technical Reference (October 1990)]] &middot; [[IBM PS2 Model 95 XP 486 Technical Reference (October 1990)]]
* [[IBM PS2 Model 90 XP 486 Technical Reference (October 1990)]], [[IBM PS2 Model 95 XP 486 Technical Reference (October 1990)]]
* [[IBM PS2 Model P75 486 Quick Reference]] &middot; [[IBM PS2 Model 55 Technical Reference (October 1990)]]
* [[IBM PS2 Model P75 486 Quick Reference]], [[IBM PS2 Model 55 Technical Reference (October 1990)]]
* [[IBM PS2 XGA Display Adapter A Technical Reference (September 1990)]]


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

Revision as of 21:25, 30 September 2026

Personal System/2 Models 95 XP 486, 90 XP 486, 55 LS and P75 486 Fundamentals is an IBM International Technical Support Center Redbook, document number GG24-3616-00, Release 1.0, First Edition (October 1990). It applies to the PS/2 systems and options announced in the fourth quarter of 1990: the Model 90 XP 486, Model 95 XP 486, Model 55 SX LS and Model P75 486. The abstract gives 176 pages; the PDF has 200. It was written as reference material for IBM customers and systems engineers, not as a service manual.

Contents

Page numbers are the book's own.

Part Chapters Page
Introduction 1.0 Introduction; 2.0 Product positioning (90/95 XP 486 p. 3, 55 LS p. 4, P75 486 p. 4) 1
Models 90 XP 486 and 95 XP 486 3.0 General system description; 4.0 System details and planar functions (physical specifications, operating system support, Micro Channel slot layout 4.4, battery and CMOS RAM 4.5, keyboard and mouse ports, security and SCSI security 4.7, power supply 4.8, LED display, serial and parallel ports, DMA); 5.0 Processor adapter and 256 KB cache option; 6.0 Memory subsystem; 7.0 Initial microcode load, POST and the system partition; 8.0 DASD; 9.0 XGA subsystems 5
Model 55 LS 10.0 Hardware (power supply, memory, riser card, token-ring and Ethernet adapters, security, DASD); 11.0 Installation, including remote IPL 99
Model P75 486 12.0 System overview, models, physical specifications, block diagram, memory, Micro Channel and SCSI, plasma display subsystem, display capability, expansion, power supply, keyboard 117
Appendices A Micro Channel (137); B Antialiased fonts (141); C Programming the XGA (149); D IML error codes (157); E Announcement summary, October/November 1990 (159); F Remote IPL reference (163) 137

Figures a repairer can use

  • Battery (4.5): the 90 XP 486 and 95 XP 486 use a flat 3 V coin cell for the real-time clock (64 bytes of non-volatile RAM, holding setup data such as the password) and a separate 8 KB CMOS RAM that holds the configuration. IBM gave a life expectancy of 7 to 10 years depending on use.
  • Power supplies (4.8): the 8590 has a 194 W auto-sensing supply (90-137 V or 180-265 V AC) and an electrical push-on, push-off power switch at the front; the 8595 has a 329 W supply whose input range must be set by switch.
  • P75 486 (12.11, 12.13): auto-sensing supply for 100-240 V at 50/60 Hz; the keyboard is the same as the P70's.
  • IML error codes (Appendix D) for the machines that load their POST and BIOS from the system partition.

What this document does not contain

It has no FRU numbers, removal procedures, Symptom-to-FRU index, schematics or component values. For register-level detail it refers to the model technical references and the Hardware Interface Technical Reference.

Download: IBM PS2 Models 95XP486 90XP486 Fundamentals.pdf

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