Mike Harris Posted October 23, 2019 Share Posted October 23, 2019 (edited) This is a copy of part of my blog but covers the BIOS I recovered from the Disk Drive I just picked up. Anyone, please feel free to comment. MAME uses AD 31 rev a 09-27-84 BIOS Mine uses AD 31 rev a 10-11-84 BIOS Aside from date I see no difference but I have yet to do a byte compare and am lazy to do so anyway. I see that both are Revision A, Checksum AD 31....just that they have different dates which could always be the date it was burned. It is a 4k Hitachi HN462732G Eprom Other than that, nothing new. Time to recover the 6801 internal controller code. Lets see if I can. UPDATE---------- Fought the laziness and checked the code. they match byte for byte so it's just the date. Being as I can screw with the BIOS I am trying to think up something that hasn't been done before but I don't see anything. I think I'll just hook to an Arduino and see what happens. Edited October 24, 2019 by Mike Harris Quote Link to comment Share on other sites More sharing options...
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