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The '''PS/2 Model 80 schematic set''' is twenty sheets of circuit diagrams for the [[IBM PS/2 Model 80|PS/2 Model 80]] (8580), '''Revision 1, dated 16 October 1991'''.
<templatestyles src="Template:StyledTable/styles.css" />
The '''PS/2 Model 80 schematic set''' is twenty sheets of third-party logic drawings of the [[IBM PS/2 Model 80|PS/2 Model 80]] (8580) system board. Every title block reads "Maintenance Information Technologies", "PS/2 80", "90X9152-01" and "COPYRIGHT APPLIED FOR", with sheet number "n OF 20", revision 1 and date 10/16/91. The notice beside the title block says the content was sold for the buyer's unlimited use and must not be copied for republication or distribution outside the buyer's company, and gives no warranty of accuracy. The scan is image-only.


'''Every sheet names the planar it was drawn from: IBM part number 90X9152-01.''' That matters &mdash; the Model 80 shipped with more than one planar type over its life, and these sheets document one of them. Check the number on your own board before trusting a designator.
The drawings are of the board marked 90X9152-01. Check the number on the board in hand before relying on a designator.


These sheets are '''not an IBM publication.''' Every title block carries the name '''Maintenance Information Technologies''' and the words "COPYRIGHT APPLIED FOR", together with this notice:
== Contents ==
{| class="wikitable styled-table"
! Sheet !! Title !! Sheet !! Title
|-
| 1 || Bus || 11 || Real Time Clock
|-
| 2 || CPU || 12 || DMA I/F
|-
| 3 || Video I/F || 13 || Bus Connectors A
|-
| 4 || Memory || 14 || Bus Connectors B
|-
| 5 || Clocks || 15 || I/O Control
|-
| 6 || Interrupts || 16 || PALs
|-
| 7 || Serial I/O || 17 || Bus Signals
|-
| 8 || Printer I/O || 18 || PALs B
|-
| 9 || Keyboard I/F || 19 || PALs C
|-
| 10 || Disk I/F || 20 || PALs C (continued)
|}


:''"Servicing of any electronic product should only be performed by qualified personnel. This drawing and information has been Copyrighted by the company listed. Its content has been sold for the unlimited use to you. The only restrictions are that it not be copied for republication or distribution outside your company. No patent liability is assumed with respect to the use of information contained herein. Maintenance Information Technologies believes the information herein to be correct. We are not responsible for any typographical errors; no direct or implied warranty is made to its accuracy. Specifications subject to change without notice."''
The drawings carry designators and values for the parts on each circuit. Sheet 11, for example, has the MC146818A real-time clock with its 32.768 kHz crystal and the LM386 audio amplifier with its capacitors. The four PAL sheets show the programmable logic devices as connection diagrams with their pin signals; they do not give the PAL equations.


Maintenance Information Technologies was a third-party publisher of service schematics for the independent repair trade in the late 1980s and early 1990s. IBM itself never published a PS/2 schematic.
== What this document does not contain ==
There is no parts list, bill of materials, board layout or power-distribution sheet, so the set is not a complete capacitor list, and there are no PAL programming equations.


== What it contains ==
== Pages that cite this document ==
 
* [[IBM PS/2 Model 80]] and [[IBM PS/2 Model 80 Capacitor Replacement Guide]] link it.
Twenty sheets, each headed "PS/2 80" and "90X9152-01", marked "SHEET ''n'' OF 20":
* The Model 80 technical references of [[IBM PS2 Model 80 Technical Reference (April 1987)|April 1987]], [[IBM PS2 Model 80 Technical Reference (May 1988)|May 1988]] and [[IBM PS2 Model 80 Technical Reference (October 1990)|October 1990]], [[IBM PS2 Model 30 Schematics]], [[IBM PS2 Model 50 Schematics]] and [[IBM PS2 225W Power Supply 72X6665 Schematic (Tube Time, 2024)]] list it as related.
 
# '''BUS'''
# '''CPU'''
# '''VIDEO I/F'''
# '''MEMORY'''
# '''CLOCKS'''
# '''INTERRUPTS'''
# '''SERIAL I/O'''
# '''PRINTER I/O'''
# '''KEYBOARD I/F'''
# '''DISK I/F'''
# '''REAL TIME CLOCK'''
# '''DMA I/F'''
# '''BUS CONNECTORS A'''
# '''BUS CONNECTORS B'''
# '''I/O CONTROL'''
# '''PALS'''
# '''BUS SIGNALS'''
# '''PALS B'''
# '''PALS C'''
# '''PALS C''' ''(continued)''
 
Four of the twenty sheets are given over to the '''PAL equations''', which is unusual and useful: the Model 80 planar's glue logic is in programmable arrays, and without those sheets a signal trace simply stops at the device.
 
== What it does not contain ==
 
'''No text layer.''' These are scanned drawings. `pdftotext` returns almost nothing and OCR returns garbled fragments, so read them as page images, not as text.
 
'''No parts list, no bill of materials, no board silkscreen map and no power distribution sheet.''' The component values that are shown are the ones drawn on the signal circuits themselves. Bulk electrolytics and the planar decoupling do not appear, so these sheets will '''not''' give you a recapping list &mdash; but they will give you the value of a specific resistor or small capacitor in a circuit you are tracing, which is more than any IBM publication does.
 
There is no revision history and no statement of which planar revision a Model 30 or Model 50 sheet was drawn from.
 
== What it settles ==
 
Together with the [[IBM PS2 Model 80 Technical Reference (April 1987)|April 1987 technical reference]], this set gives the Model 80 both ends of the documentation range that IBM machines usually lack: IBM's own power supply and interface specification, and a third-party drawing with designators and values on it. The schematics apply to '''planar 90X9152-01''' specifically.


<pdf> File:IBM PS2 Model 80 Schematics.pdf </pdf>
<pdf> File:IBM PS2 Model 80 Schematics.pdf </pdf>


Download it here: [[:File:IBM PS2 Model 80 Schematics.pdf|IBM PS2 Model 80 Schematics.pdf]]
Download: [[:File:IBM PS2 Model 80 Schematics.pdf|IBM PS2 Model 80 Schematics.pdf]]
 
== Related pages ==
 
* [[IBM PS/2 Model 80]] &middot; [[IBM PS/2 Model 80 Maintenance Guide]] &middot; [[IBM PS/2 Model 80 Troubleshooting Guide]] &middot; [[IBM PS/2 Model 80 Capacitor Replacement Guide]]
* [[IBM PS2 Model 80 Technical Reference (April 1987)]] &middot; [[IBM PS2 Model 80 Technical Reference (October 1990)]]
* [[IBM PS2 Model 30 Schematics]] &middot; [[IBM PS2 Model 50 Schematics]]


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

Latest revision as of 21:58, 30 September 2026

The PS/2 Model 80 schematic set is twenty sheets of third-party logic drawings of the PS/2 Model 80 (8580) system board. Every title block reads "Maintenance Information Technologies", "PS/2 80", "90X9152-01" and "COPYRIGHT APPLIED FOR", with sheet number "n OF 20", revision 1 and date 10/16/91. The notice beside the title block says the content was sold for the buyer's unlimited use and must not be copied for republication or distribution outside the buyer's company, and gives no warranty of accuracy. The scan is image-only.

The drawings are of the board marked 90X9152-01. Check the number on the board in hand before relying on a designator.

Contents

[edit | edit source]
Sheet Title Sheet Title
1 Bus 11 Real Time Clock
2 CPU 12 DMA I/F
3 Video I/F 13 Bus Connectors A
4 Memory 14 Bus Connectors B
5 Clocks 15 I/O Control
6 Interrupts 16 PALs
7 Serial I/O 17 Bus Signals
8 Printer I/O 18 PALs B
9 Keyboard I/F 19 PALs C
10 Disk I/F 20 PALs C (continued)

The drawings carry designators and values for the parts on each circuit. Sheet 11, for example, has the MC146818A real-time clock with its 32.768 kHz crystal and the LM386 audio amplifier with its capacitors. The four PAL sheets show the programmable logic devices as connection diagrams with their pin signals; they do not give the PAL equations.

What this document does not contain

[edit | edit source]

There is no parts list, bill of materials, board layout or power-distribution sheet, so the set is not a complete capacitor list, and there are no PAL programming equations.

Pages that cite this document

[edit | edit source]

Download: IBM PS2 Model 80 Schematics.pdf

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