Posted By
Gaia
on 2004-07-28
11:21:13
|  Re: writing software to eprom
I can't help with the EPROM's but the language you must use is definitely the MOS 6502 assembly. There's a four byte long magic word (CBM something) that must be at a certain position (check the BASIC ROM for the exact place) and your startup code must be placed at $8000 if I'm right for the kernal to interpret your cart as being valid... You could maybe dissect one such autostart cartridge along with a disassembly of the relevant parts of the plus/4 kernal.
Anyways, you're probably better off directing your HW-hack related questions to the CBM hackers mailing list at:
http://www.softwolves.pp.se/misc/arkiv/
There are a lot of friendly and competent people hanging out there.
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