Note that hex 2000 is actually 8KB (8.192 bytes). In the following table “L” or “R” tells if the jumper should be installed in the Left or Right position.
So in fact the 3 jumpers will choose between up to 8 ROMS of 8KB each. 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.
0 kommentar(er)
