lidnariq wrote:
Looking at the register layout of the
FME-7, only one thing comes to mind to test: given the differences between the Namco 163/175/340, it's remotely plausible that pseudoregister 8 (controlling the bank at $6000) might behave differently? (See also byemu's post) I see no reason to suspect that any other behavioral differences will exist.
It's remotely conceivable that the FME-7 and 5a might do something funny with register writes to $C000 and $E000. (what? who knows. maybe pins 3 and 18 are digital outputs).
It would be interesting to know, since you've got the sockets already, whether pseudoregister 8 still drives lines
PRG ROM A13…A18 according to the latched value when it's configured to RAM. (in other words, it would be nice to know if the
musing on the wiki about bankable prg-ram is true or not)
I have three carts,Barcode World (J),Batman (J),Gremlin 2 - Shinshu Tanjou (J).
I'm try to debug on kazzo.
The results are:
Barcode World(FME-7) only bank sram to 6000~7fff (can't bank prg-rom to here)
Batman (5a) can't bank anything to 6000~7fff (no sram on this game)
Gremlin 2(5a) can bank prg-rom to 6000~7fff (be marked as 5b in "NES Cart Database")
The circuit of Batman and Gremlin 2 on prg is exactly the same.