Josh: Commodore PET 2001 service documentation from the zimmers.net CBM archive

2026-09-22T17:16:09Z

Commodore PET 2001 service documentation from the zimmers.net CBM archive

New page

== Summary ==
Commodore's three-sheet '''main logic schematic''' for the [[Commodore PET 2001]], for board assembly '''320008''' (6540 ROMs, 6550 RAM).

Sheet 1 is drawing 320130, ''circuitry common to all PET computers''. Sheets 2 and 3 are drawing 320026 and are specific to assembly 320008. Commodore's note on sheet 3 records that '''all component locations are the same on all four original boards''' — 320008, 320081, 320132 and 320137 — and that only the specific components differ, with the identifying board number in the upper left corner of the board.

The sheets show the 8 MHz master crystal Y1, the two cassette-motor drivers (2N3904 → 7.2 V zener → 2N4401 → TIP29) fed from the +9 V unregulated rail, and the test points TP2–TP5.

== Licensing ==
'''Author:''' Commodore Business Machines, Inc.<br />
'''Licence:''' Manufacturer service documentation, reproduced here for repair and preservation purposes. Copyright remains with the rights holder. The original sheets carry a 1970s Commodore confidentiality notice, which is of historical interest only.<br />
'''Source:''' [http://www.zimmers.net/anonftp/pub/cbm/schematics/computers/pet/2001/ zimmers.net Commodore PET 2001 schematics archive]

[[Category:Commodore Schematics]]
[[Category:Schematics]]

File:Commodore PET 2001 Main Logic Schematic (320008).pdf - Revision history

Josh: Commodore PET 2001 service documentation from the zimmers.net CBM archive