Editing System Board Parts List (2 of 3)

'''Sheet 2 of Commodore's ''Main Logic Assembly Parts Cross Reference''''' for the [[Commodore PET 2001]] — the integrated circuits. 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 2 is the '''IC cross-reference''', and it is the useful sheet for anyone socket-testing a dead PET:

<templatestyles src="Template:StyledTable/styles.css" />
{{| class="wikitable styled-table"
|-
! Ref !! Device !! Commodore part no.
|-
| '''UF3''' || 6502 MPU || 901435-01
|-
| '''UB8, UG8''' || 6520 PIA || 901436-01
|-
| '''UA5''' || 6522 VIA || 901437-01
|-
| UC3, UC4, UI1–UI8, UJ1–UJ8 || '''6550 RAM''' || 901438-01
|-
| UC3, UC4, UI1–UI8, UJ1–UJ8 || '''2114 RAM''' || 901453-01
|-
| UA2 || 2316B-08 character generator || 901447-08
|-
| UA7, UA8, UA9 || MC3446 interface bus || 901524-01
|-
| UG2 || 74LS154 decoder || 901521-10
|-
| UG9 || 74LS145 || 901521-09
|-
| UB2 || 74LS165 shift register || 901521-12
|-
| UB3, UB4, UG5, UG6, UH8, UH9 || 74LS244 buffer || 901521-13
|-
| UD2, UD3, UD4 || 74LS157 data selector || 901521-11
|-
| UD6, UD7 || 74177 counter || 901522-03
|-
| UE3, UE4 || 7417 hex buffer || 901522-01
|-
| UE6 || 74100 latch || 901522-02
|-
| "UDE9" || LM555 timer || 901523-01
|-
| UH1, UH2, UH3 || 6540-011/-013/-015 or 2316B-01/-03/-05 ROM || 901439-01/-02/-03 or 901447-01/-03/-05
|}}

'''The RAM line is printed twice''', once for the 6550 and once for the 2114, against the same eighteen positions — that is how Commodore expressed the difference between board assemblies 320008/320081 (6550) and 320132/320137 (2114). '''The two are not interchangeable.'''

The LM555 line is printed against '''"UDE9"''', which is not a valid single location; the main logic schematic places the timer at E9.

== 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 (3 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-2.gif|thumb|600px|Commodore ''Main Logic Assembly Parts Cross Reference'', sheet 2 of 3.]]

Download: [[:File:parts-2.gif|parts-2.gif]]

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