Hello guys. I took a TLROM cart to check each pin, one by one, of the PRG and CHR mask ROMs.
Everything pretty much matched the docs on the nesdev page, except for pins 01 and 02 of the PRG chip. Pin 01 of the chip (labeled A17) is connected to pin 25 of the MMC3 (labeled A18). And pin 02 of the chip (labeled A18) is connected to pin 23 of the MMC3 (labeled A17).
The same was true for my SMB3 cart.
So, what pinout is wrong? The mask ROM's or the MMC3's?
Thanks!
Everything pretty much matched the docs on the nesdev page, except for pins 01 and 02 of the PRG chip. Pin 01 of the chip (labeled A17) is connected to pin 25 of the MMC3 (labeled A18). And pin 02 of the chip (labeled A18) is connected to pin 23 of the MMC3 (labeled A17).
The same was true for my SMB3 cart.
So, what pinout is wrong? The mask ROM's or the MMC3's?
Thanks!