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I recently acquired a Thomson TO7/70 home computer. It came without any MEMO7 cartridges (ROM cartridges) that are necessary to properly use it. I found images of the ROMS, and a schematic, so in principle it should be possible to make your own cartridge and program with the images.

Ideally I'd like something that can be easily programmed from a PC (maybe through serial or USB). One can still buy parallel EEPROMs, but I don't own an EEPROM programmer.

Has anyone every done something similar before? Maybe for a different computer? Any suggestions, tips, recommendations for parts?

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It's funny you should ask this now, Daniel (who runs the site you found the ROMs and schematic on) and Phil (another 8-bit enthusiast) recently produced an EEPROM-based PCB for exactly this purpose. You can find out more about it on the system.cfg forum (in French).

Daniel has many other Thomson hardware projects, including an SD card reader and associated controller (which would allow you to use any floppy-based Thomson software).

You can find cartridge-based systems which meet your requirements on other platforms; the Atarimax Maxflash cartridge is one example for 8-bit Ataris.

  • Ah, nice find. Having someone else burn the EEPROM would solve the problem of the missing EEPROM programmer, yes. :-) Though I'd be still curious if something couldn't be made that I could program myself. Is there any information how the Maxflash cartridge works? I couldn't find any on the site. – dirkt May 5 '16 at 6:46

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