Editing IBM PC 5150 Technical Reference

The '''IBM Personal Computer Technical Reference''' (Hardware Reference Library), '''Revised Edition, April 1984''', '''IBM part number 6322507''', is the 309-page technical reference for the [[IBM PC (5150)|IBM PC 5150]]. &copy; IBM 1981, 1982, 1983, 1984.

This is one of the small number of documents on this wiki for which IBM '''did''' publish component-level drawings: Section 1 ends with '''logic diagrams''' of the system board, printed as a ten-sheet set for the 64&ndash;256&nbsp;KB planar.

== What it contains ==

* '''Section 1, System Board (1-1)''' &mdash; the 8088, data flow diagrams, the system memory map, timers, interrupts, ROM, RAM and DMA; the '''I/O channel''' with its diagram, signal descriptions and address map (1-14 to 1-24); other circuits including the '''speaker circuit''' (1-25) and the '''cassette interface''' with block diagrams (1-27); the 8255A I/O bit map (1-31); the '''system-board switch settings''' (1-33); specifications and card specifications (1-34); and the '''logic diagrams''' (1-36).
* '''Section 2, Coprocessor''' &mdash; the 8087, its programming and hardware interface, and the data-type table.
* '''Section 3, Power Supply (3-1)''' &mdash; input requirements, the Vdc and Vac outputs, overvoltage/overcurrent protection on both primary and secondary sides, the power good signal, and the power supply connectors with pin assignments.
* '''Section 4, Keyboard''' &mdash; block diagram, keyboard diagrams, connector specifications and the '''keyboard logic diagram''' (4-13).
* '''Section 5, System BIOS''' &mdash; usage, keyboard encoding, the BIOS cassette logic and the '''full System BIOS assembler listing''' (5-29).
* '''Section 6, Instruction Set'''; '''Section 7, Characters, Keystrokes and Colors'''; '''Section 8, Communications'''.

== What it does not contain ==

Not a service manual: no FRU part numbers, no removal and replacement procedures, no symptom-to-FRU index and no fault trees. The logic diagrams show the board as designed; they are not a silkscreen map, and there is no bill of materials, so a capacitor's designator has to be matched to the board by hand.

It documents the '''64&ndash;256&nbsp;KB''' planar as its primary subject; the earlier 16&ndash;64&nbsp;KB board is covered by earlier editions of the same book.

== What it settles ==

'''The 5150 power supply.''' Four DC outputs: '''+5.0&nbsp;Vdc''' 2.3&ndash;7.0&nbsp;A at +5&nbsp;% / &minus;4&nbsp;%; '''&minus;5.0&nbsp;Vdc''' 0.0&ndash;0.3&nbsp;A at +10&nbsp;% / &minus;8&nbsp;%; '''+12.0&nbsp;Vdc''' 0.4&ndash;2.0&nbsp;A at +5&nbsp;% / &minus;4&nbsp;%; '''&minus;12.0&nbsp;Vdc''' 0.0&ndash;0.25&nbsp;A at +10&nbsp;% / &minus;9&nbsp;%.

It also documents something easily forgotten: the 5150 supply has a '''filtered, fused AC output''' switched by the main power switch, with a maximum of '''0.75&nbsp;A''' at the rear receptacle. That is the socket the monitor plugged into, and it is live logic, not a pass-through.

<pdf> File:IBM PC 5150 Technical Reference.pdf </pdf>

Download it here: [[:File:IBM PC 5150 Technical Reference.pdf|IBM PC 5150 Technical Reference.pdf]]

== Related pages ==

* [[IBM PC (5150)]] &middot; [[IBM PC (5150) Maintenance Guide]] &middot; [[IBM PC (5150) Troubleshooting Guide]] &middot; [[IBM PC (5150) Capacitor Replacement Guide]]
* [[IBM Cassette BASIC]] &middot; [[IBM Model F (83-key)]] &middot; [[IBM Monochrome Display Adapter]] &middot; [[IBM Color Graphics Adapter]]
* [[IBM PC XT Technical Reference (First Edition)]] &middot; [[IBM PC AT 5170 Technical Reference (March 1984)]]
* [[IBM Personal Computer Family Service Information Manual]]

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