Gabriel LP Posted July 20, 2021 Share Posted July 20, 2021 Hello Community: I bought recently 2 atari 2600 games, Kangaroo and Mr. Do!, they came with PAL16L8 and MBM2764 eprom, my problem is that the binary files from internet and the DUMP from the g ames i own are TOTALLY diferent.... can somebody help me with that? I CAN´T dump the PAL16L8, thanxs. Kangaroo 64k.BIN Mr. DO 64k.BIN Quote Link to comment Share on other sites More sharing options...
KevKelley Posted July 20, 2021 Share Posted July 20, 2021 With the Pal cart, shouldn't that window be covered? Is it possible over time it got erased for being open? Quote Link to comment Share on other sites More sharing options...
alex_79 Posted July 21, 2021 Share Posted July 21, 2021 Those boards swap around the data and address signals going to the eprom, and therefore the rom programmed in there has to be "scrambled" in such a way that will appear correct when read from the cartridge port. Both the bits in each byte as well as the order of the bytes has been altered. That's why they are so different (and why they don't work in an emulator), if you dump them directly from the chips. Here are the roms rearranged to match what the CPU in the Atari would actually see when those carts are plugged in (and this is what you would get by using a cartridge dumper). These can be run on emulators, flashcarts or burned on standard carts. Mr._DO.binKangaroo.bin Only a few bytes differ between these and the original NTSC roms. 3 Quote Link to comment Share on other sites More sharing options...
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