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Personally I don't consider dumping pirates is any important, because they basically suck compared to the original versions of the game which have all been dumped already.
At least I have 5 reason to do it by myself :
1. Learning!
2. I have the PCB so I have the schematic, I want to have the mapper number too.
3. I want to have the selection screen code and do some reverse engineering on it.
4. I want to test if AX5202P is exactly same as glop top MMC3 which supports up to 1MB PRG and 1MB CHR.
5. My real goal is having a customized multi-cartridge of Nekketsu series games translated to Farsi! (this is my childhood dream!
)
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isolate the address line by cutting trace and soldering directly to the trace as close as possible to the rom glop top.
Yes, that's it
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Man, this must have been hell to do. And you had to do this for BOTH chips... You are a very determined person, I'll give you that.
I like it, this is my hobby.
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Anyway, the games appear to be running fine, just with the wrong tiles mapped in. Maybe this mapper is slightly different from mapper 52 and the bits that select the CHR bank act a little differently, or you swapped wires when dumping the CHR and some pages ended up in the wrong place?
Except Spy Hunter which doesn't run at all, the others runs ok trough the game.
By separating the games and giving them Mapper 4, all of them runs ok!
The selection screen code has been embedded into the Sumari PRG.
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I would try finding the code that maps in the selected game and change the bits of the written value that select CHR pages, to see if it's possible to find the correct graphics
Can you fix it for me?