nesdev.org

Update:

Worked fined. Used a Japanese board as donor and replaced the CIC chip and maskrom with PAL ones..

tepples wrote:Mirroring to a power of 2 and then mirroring to the whole EPROM should also work. It can just be slower at times, especially with a slow EPROM programmer.

How should this mirroring be done? For example with a 3MB rom to a 4MB chip, how should it be done?

BR

You'd be surprised at how many games rely on the entire memory being mirrored. Mega Man X is 1.25 MB and will break early on if you don't properly duplicate the last .25 MB four times. Just want to make sure that I understand you correctly. For a game like Mega Man X, the last part of the rom (in t...

Would it be possible to use a NTSC board (with a D411) as a donor for a PAL game, if I just replaced the CIC chip with one from a PAL board (D413)? Or would this bring any other problems?

ROM images that aren't power of two (.75 MB, 1.25 MB, 1.5 MB, 2.5 MB, 3 MB) will need to be mirrored up to a power of two. Mega Man X is another game that depends on this. But after it's mirrored up to a power of two, you can get away with tying unused high address lines to ground. Thank you for yo...

I have trouble with getting my 8Mbit game burned on a 32Mbit eprom to work when placing it inside my donor cart (SHVC-1A3M-30). Im using a 32Mbit eprom (MBM29F033C) mounted on a type-III adapter (TSOP40 to Dip36) from buyicnow.com, and the rom that is burned to the eprom is an 8Mbit rom. The rest of...