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Hi, I am currently with Ciro in his place, we did dump his original cartridge TI Logo II - Deutsch. We did use the GramKracker device and also verified our finding by reading the grom memory when the module was in and all GramKracker functionality was off. The cartridge uses - 8K Rom - Grom 6000 (bank 3) - Grom 8000 (bank 4) - Grom A000 (bank 5) - Grom E000 (bank 7) The oddity is the Bank 6 is unused but nevertheless its memory space is reserved, as we see the last grom starts at E000 It is matching the "information" from the PC99 dump from Mike Wright, but it appears the rpk dump on whtech is using the content of bank 7 at bank6 if you examine the .bin file. Both dumps allow you to start the cartridge, but I can imagine that once the content of the last grom is required only one will work. So the question is, can the Grom Bank be modified without breaking functionality? Br Klaus