Component Database

This unique database contains a list of vintage computers/devices along with major IC codes found within.

This database is still under development so any mistakes you may spot or if I've missed out a computer I will do my best to get them added. Anyone interested in adding a computer themselves to the database, please email me and I can set you up as an admin.

I am also hoping to complete the compatibility feature so if you are aware of chips that are compatible with other chips and I have not yet marked them as compatible, please feel free to email me and let me know!

Useful Links

COMMODORE PET 8032

I picked this machine up on Ebay which included a 8050 Dual Disk Drive. Like the 4032 I purchased earlier this 8032 and the Disk Drive were sold as none working.

The 8032 would prove to be much more difficult to repair than the 4032, there were several components that turned out to be faulty. The full thread detailing what I did to get it working can be found here.

To sum up the problems I had with the 8032:

  • 3 Broken ROMS (Kernal, Display, Basic 1)
  • 4 Broken 2114 display RAMS
  • 1 broken 4116 main RAM
  • 2 broken 6520's
  • 1 broken 74LS244

COMMON PROBLEMS

From my own experiences fixing my 8032 and 4032, here's a list of common problems that may stop a PET from working.

Display RAM (Static)

The usual symptoms are random characters on the screen when booting. This will not stop the machine from responding to keyboard input (assuming the keyboard contacts are good), so to verify if the rest of the machine is functional just press a few keys and you should see the characters changing on the screen in response to the key presses.

Main RAM (Dynamic 4116)

When powered on the PET will display the amount of good RAM available. The PET needs only the 1st 1KB of RAM to be good for it to be able to boot into BASIC. The RAM the 4032 uses (4116) are fairly common dynamic RAM and can be picked up cheaply on Ebay or if you have a spare ZX Spectrum lying around (like I did) as this uses the same chips fro its lower 16K of memory.

ROM's

If any of the ROM's are faulty they can be swapped out for 2532 EPROM's which again, like the RAM, are fairly easy to get hold of on Ebay.

  • All Commodore PET ROM images can be found here.

PET Vet

A very useful tool for diagnosing PET problems PETVet board that not only gives you 32K RAM, it also allows you to diagnose most problems with any PET.

  • Infomation about the PETvet can be found here.

Component List for Commodore PET 8032

Title Mounting Qty Notes
2114 Static RAMSoldered4UC4,UC5,Display RAM
4116 3N Dynamic RAM Soldered16UA4-UA19
555Soldered1UD16
74154Soldered1UE12
74166Soldered1UA2
7417Soldered1UD15
74177Soldered3UD3,UE6,UE7
7425Soldered1UE14
7486Soldered1UC2
74LS00Soldered3UD5,UE5,UE11
74LS02Soldered1UD1
74LS04Soldered1UE15
74LS10Soldered2UD4,UE13
74LS145Soldered1UC11
74LS157Soldered4UC8-UC10,UE2
74LS164Soldered1UE3
74LS244Soldered11UB4-UB7,UB9,UB10,UE8-UE10,UD13,UD14
74LS373Soldered2UB3,UB8
74LS42Soldered1UC3
74LS74Soldered1UB2
74S04Soldered2UD2,UE4
74S74Soldered2UC1,UE1
8024Soldered1UB11
FPQ2222Soldered1UE16
HD46505SPSocket1UB13
MC3446NSoldered3UB17,UC12,UA20
MOS 6502Socket1UB14, Main CPU
MOS 6520Soldered2UB12,UB16
MOS 6522Socket1UB15
MOS 901447-10 - Character ROM BASIC 1 & 2Socket1UA3
MOS 901465-20 - BASIC 4 ROMSoldered1UD9
MOS 901465-21 - BASIC 4 ROMSoldered1UD8
MOS 901465-22 - BASIC 4 Kernal ROMSoldered1UD6
MOS 901465-23 - BASIC 4 ROMSoldered1UD10
MOS 901474-04Soldered1UD7

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