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PostPosted: Tue Feb 24, 2015 4:32 pm 
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Joined: Mon Feb 23, 2015 8:05 pm
Posts: 11
lidnariq wrote:
This is really straightforward hardware to add. It's a 74'138 and a latch such as a (74'74 or 74'161) on top of a board already containing an MMC3.

Wire the 74'138 to detect writes to $41xx by connecting:
R/W to /G1a
A13 to /G1b
M2 to G2
/ROMSEL to A
A8 to B
A14 to C
Then
74'138 /Y7 to latch CLK
CPU D2 to latch data in
latch data out to CHR A18.


wow, thanks... I didn't expect this. I'll still have to check if the rom depends on the other mappers. But this information might make a repro possible again.


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