Well, I'm having a problem with a repro I'm trying to make.
The pirate board I've got is from a to The Earth donor and I'm having touble using bigger ROMs on it, no one was booting.
I tried a PRG ROM with Recca, surprisingly it boots and even plays (at least the 1st stage), but have garbled sound.
I tried to disconnect A15 from the ROM, the game did not boot.
With A15 connected I see no difference in connecting or not the A16 line to the ROM.
This lead me to suppose that the PRG's A16 line is not connected inside the epoxy blob.
I think it may not be possible or would be too complex to do, but I'll ask anyway: can the PRG ROM's A16 be decoded exernally??
I have not touched the CHR yet, but I suppose this should have the same problem.
I also tried other unconnected esternal "pins" from the epoxy blob, and got the same results or a not booting game.
Thanks in advance.
The pirate board I've got is from a to The Earth donor and I'm having touble using bigger ROMs on it, no one was booting.
I tried a PRG ROM with Recca, surprisingly it boots and even plays (at least the 1st stage), but have garbled sound.
I tried to disconnect A15 from the ROM, the game did not boot.
With A15 connected I see no difference in connecting or not the A16 line to the ROM.
This lead me to suppose that the PRG's A16 line is not connected inside the epoxy blob.
I think it may not be possible or would be too complex to do, but I'll ask anyway: can the PRG ROM's A16 be decoded exernally??
I have not touched the CHR yet, but I suppose this should have the same problem.
I also tried other unconnected esternal "pins" from the epoxy blob, and got the same results or a not booting game.
Thanks in advance.