Luckily the A13, A14 and A15 jumpers on the ROM cartridge actually makes it possible to choose 8 different “banks” of 8KB out of the 64KB EEPROM. You could install one ROM per EEPROM, but since all the diagnostic ROMs i found were 8KB and the EEPROM was 64KB it would waste a lot of EEPROM space. Then I made a plan for which ROMs I wanted to put on the EEPROM and at which address in the EEPROM. If you don’t need jumpers, you should leave the traces alone so the pins are not floating :-). WARNING: All the jumpers have default traces on the PCB you need to break before installing pin headers for jumpers. I need to have full access to the jumpers and EEPROM so I can re-program it. The PCB is delivered with a plastic case, but I don’t use it.
So i choose to buy something working and even got a plastic case.īought from Then the task was simply to figure out how the Cartridge PCB works. In future projects I’m planning to try to order prototype print online, but I did’nt have the PCB layout and currently have no experience in ordering PCBs online. I know I could have programmed my EEPROMs with a PC parallel port or an DIYArduino programmer, but I needed a programmer for other projects anyway TL866CS Mini USB high-performance universal programmer with 5 socket adapters.The price was low and I’ve had them for some time before I found out, so I did’nt complain to the seller Strangely enough the 2 pcs in the same tube were defective (the programmer software warned about wrong IDs and was not able to erase them – not even with the ID-check turned off). They shipped in 3 tubes, 2*4 pcs and 1*2 pcs. And why not take it to the next level:ġ0 pcs bought on from a Top-rated seller. Unfortunately I did’nt win Jan Betas Commodore 64 Cartridge give away, so I had to build my own.
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