infiniteneslives wrote:
What kind of test setup do you have?
An oscilloscope and a 16-channel logic analyzer. Nothing to interact with stuff outside of the NES at this point.
infiniteneslives wrote:
Something I've been meaning to look into but been too lazy to do is determine the MMC3's CHR A12 filtering exactly. It would require testing with something besides the NES, as you'd need control of signals beyond what you can do with the NES.
Interesting. I have a couple of ideas for testing this. I'll think about it a bit.
infiniteneslives wrote:
verified the MMC1's double write cycle protection was based on what appears to be latching of PRG R/W with M2 as a clock.
Cool! Was wondering how that might work.