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Diffstat (limited to 'README')
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@@ -0,0 +1,26 @@ +This will be a commented disassembly of the Atari 8-bit computer +Defender cartridge. + +I found 2 versions of the ROM. "defender.rom" is from here: + +http://www.atarimania.com/game-atari-400-800-xl-xe-defender_1561.html + +defender.8humans.rom is found in both the Holmes Archive and the TOSEC +collection (Atari_8_bit_TOSEC_2012_04_23.zip). + +These are almost identical. See "notes" for differences between the two +images. It turns out that the 8 humans version is a badly done crack, +that must have been converted from a cracked XEX back into a ROM! + +$ md5sum *.rom +e8d52b4aa33da38f99312f9aa8b48885 defender.8humans.rom +8709351e76ec7c407e63c47ac53f8d19 defender.rom + +Disassembly is done with da65 (from the cc65 suite), using the old +"edit the da65 .info file, disassemble, name things, edit again, etc" +cycle. At some point, I'll clean up the formatting to make it look more +human-readable, and use some conditional assembly (ifdefs) to allow +assembling either version, and maybe as either a .xex or a ROM. + +At any point, you can check whether the disassembly really assembles +back into the original ROM image by running "make test". |