Editing System Board Parts List (3 of 3)

'''Sheet 3 of Commodore's ''Main Logic Assembly Parts Cross Reference''''' for the [[Commodore PET 2001]] — the remaining ROMs and the socket types. Commodore Business Machines, Inc., Palo Alto, California, scanned at 400 dpi.

'''Commodore's own title for this document is ''Main Logic Assembly Parts Cross Reference''''', not "System Board Parts List". It lists every component on the PET's system board by reference designator, description and Commodore part number.

Sheet 3 completes the ROM map and lists the sockets:

<templatestyles src="Template:StyledTable/styles.css" />
{{| class="wikitable styled-table"
|-
! Ref !! Device !! Commodore part no.
|-
| UH4 || 6540-016 ROM / 2316B-06 ROM || 901439-04 / 901447-06
|-
| UH5 || 6540-012 ROM / 2316B-02 ROM || 901439-05 / 901447-02
|-
| UH6 || 6540-014 ROM / 2316B-04 ROM || 901439-06 / 901446-04
|-
| UH7 || 6540-018 ROM / 2316B-07 ROM || 901439-07 / 901446-07
|-
| '''UH1''' || '''6540-019 ROM (rev.) / 2316B-09 ROM (rev.)''' || '''901439-09 / 901447-09'''
|-
| UA2, UH1–UH7 || 28-pin socket || 904153-05
|-
| UA2, UH1–UH7 || 24-pin socket || 904153-04
|-
| UA5, UB8, UF3, UG8 || 40-pin socket || 904153-06
|-
| UC3, UC4, UJ1–UJ8, UI1–UI8 || 22-pin socket || 904153-03
|}}

Two things on this sheet are worth knowing before ordering parts:

* '''The revised UH1 ROM''' — 6540-019 / 2316B-09, parts 901439-09 and 901447-09 — is added at the foot of the sheet in a different typeface from the rest, evidently a later addition. It is the only record of that revision in Commodore's PET 2001 documents held here.
* '''The two ROM families are different pin counts.''' The 6540 is a 28-pin device and the 2316B a 24-pin device, and the sheet lists both socket types against the same positions. A board built for one will not take the other without rework.

== What this document does not cover ==
The PET 2001's '''power supply and monitor are a separate assembly''' with their own parts list — see [[Video Board Parts List (1 of 3)]]. Nothing on this sheet is a voltage regulator, because '''the PET 2001 main logic board has none'''; it receives +5 V and +9 V unregulated from elsewhere in the machine.

== Related pages ==
* The other sheets: [[System Board Parts List (1 of 3)]] · [[System Board Parts List (2 of 3)]]
* [[2001 Main Logic Assembly]] — the same three sheets as a single PDF
* [[Commodore PET 2001 Service Documentation]] · [[Commodore PET 2001 Capacitor Replacement Guide]] · [[Commodore PET 2001 Troubleshooting]]
* [[Schematic 320130 (Sheet 1 of 3, Static PET)]] — the circuit these parts sit in

[[File:parts-3.gif|thumb|600px|Commodore ''Main Logic Assembly Parts Cross Reference'', sheet 3 of 3.]]

Download: [[:File:parts-3.gif|parts-3.gif]]

[[Category:Commodore PET 2001 Schematics]]
[[Category:Commodore Documentation]]