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Re: RAM editing, Is this possible in MAME (and if so, how?)
04/25/22 09:48 PM
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> > When I go to edit, I get it overwritten too. Bummer. Anyone know how to get around
> > this?
>
> The values probably get overwritten because the game mirrors them in main RAM.
>
> One easy way to get around this problem is to open nvram/ccastles/nvram_4b outside
> MAME in a hex editor, since X2212 has nonvolatile backup for its own SRAM. Editing it
> is not so simple: the game code stores three copies of the same data, with simple XOR
> modifications, to check its integrity. Also keep in mind that this memory type is
> only 4 bits wide; in this case, the high nibbles are in 4A and the low nibbles are in
> 4B.
Yikes, that doesn't sound pleasant at all. Sounds like it's going to be way more trouble than it's worth. Wish there was some cheat screen or something so this field could be manually (safely & correctly) entered. I would think this would be applicable for many games that use X2212. Thanks much for the info though.
My real PCB has a 30,000 count for one coin count and a 20,000 count for the other coin count. I guess I'm not simulating this after all.
PM's turned off. If you want to reach me, direct email please.
Joe (joemagiera at ameritech dot net)
[email protected]
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