A module which plugs into the 6502 socket of a Commodore PET to diagnose faults.Designed by Tynemouth Software, Ships from United Kingdom
What is it? This is a module which plugs into the 6502 socket of a Commodore PET to diagnose faults. It is not a 6502 emulator, in that it does not run 6502 code. It is a microcontroller which driv...Read More…
This is a module which plugs into the 6502 socket of a Commodore PET to diagnose faults. It is not a 6502 emulator, in that it does not run 6502 code. It is a microcontroller which drives the pins of the 6502 socket in the same way a 6502 would, to access the system ROM and RAM. It runs through a series of tests of the system ROM and RAM, and displays the results on the screen of the PET (by writing to the PET video RAM).
I repair a lot of Commodore PET / CBM series machines, and often you get a board which will not boot up. This will help to pinpoint where the faults are to get the machine back up and running.
This is a simple plug in module, all the Commodore PET boards as far as I am aware came from the factory with a socket on the 6502 CPU, so all that is required is to remove the 6502 and plug in the PET Diagnostics and view the results on the screen. Various types of sockets were fitted, the pins on this module are suitable for all the types I have seen, including the early high sided sockets, the white single wipe sockets and the slightly better black single wipe versions and also modern dual wipe or turned pin type sockets.
This is suitable for most models in the PET range, however there are currently timing issues seen on some early 2001 PETs with 6550 video RAM, so those are not supported at the moment.
80 column mode is supported on 8032 type machines, and the CRTC is initialised on 4000 and 8000 series machines. DIP switches on the module select the machine type.
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I write a blog about old computers, repairing them, upgrading them, replacing them. Read more at blog.tynemouthsoftware.co.uk