PRG and CHR banking of this 4-in-1 multicart can be emulated well using GNROM banking, but unlike GNROM, mirroring must be selectable, as at least one of the four games requires Horizontal and one requires Vertical mirroring. Unfortunately, I've not been able to successfully trace the CIRAM A10 line, and it's not obvious from the menu's writes which bit selects the mirroring type. The menu writes the same data to $4120 and to an address in the $8000-$FFFF region that already has the data in it as the byte being written. The data written by the menu is:
Code:
Game Mirr Data Addr (X=0-3)
----------------------------------------------------
Puzzle H 00 FFE9+X
F15 City War H 14 FFE9+X
Venice Beach Volley V 28 FFE9+X
Poke Block H/V 3C FFE9+X
----------------------------------------------------
Puzzle H 00 FFE9+X
F15 City War H 14 FFE9+X
Venice Beach Volley V 28 FFE9+X
Poke Block H/V 3C FFE9+X
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