04-06-2012, 01:16 AM
Mat! Welcome! You've done your homework. Unfortunately, I don't believe this report about SNK planning to rewrite the carts. I could be wrong, though. It's conceivable, but I don't think it's what happened (so I question the assertion).
From that doc you referenced...
Under "Figure 23. TEMPORARY SECTOR UNPROTECT ALGORITHM"
RESET = VID (Note 1)
Note : 1. All protected sectors are temporary unprotected. VID=11.5V~12.5V
So, I think this reset pin needs 12V applied, but that reset pin is wired direct to VCC on all the official carts (if I recall correctly).
It may be possible that a chip could be removed from a NGPC cart PCB, placed on another PCB, reprogrammed (with this 12V method), and then replaced back on the original cart. That's conceivable, but I don't think it solves the problem you'd like solved.
From that doc you referenced...
Under "Figure 23. TEMPORARY SECTOR UNPROTECT ALGORITHM"
RESET = VID (Note 1)
Note : 1. All protected sectors are temporary unprotected. VID=11.5V~12.5V
So, I think this reset pin needs 12V applied, but that reset pin is wired direct to VCC on all the official carts (if I recall correctly).
It may be possible that a chip could be removed from a NGPC cart PCB, placed on another PCB, reprogrammed (with this 12V method), and then replaced back on the original cart. That's conceivable, but I don't think it solves the problem you'd like solved.
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Neo Geo Pocket Flash Cart and Linker Project ( http://www.flashmasta.com/ )
Avatar art thanks to Trev-Mun ( http://trevmun.deviantart.com/ )