This is my first post here, but i've been lurking on Nesdev for about three years now.
I'm trying to write a Namco 163 test program to test a dev cartridge that I made, and I'm having an issue accessing the 128 bytes of internal RAM on Nestopia and puNES. More accurate emulators like Mesen and FCEUX, along with my dev cartridge, work just fine with using the Address ($F800) and Data ($4800) ports. However, when I try accessing the RAM on Nestopia and puNES, it just returns $48 for every address (open bus?) and doesn't play the test tone. I've included a (very much not finished) version of the test program that includes a couple tests for the Internal RAM (there's an invisible menu on the first screen).
I was wondering if anyone here knows about how these emulators handle emulating Namco 163 and how accessing the RAM works so I can write my code to work more universally.
I'm trying to write a Namco 163 test program to test a dev cartridge that I made, and I'm having an issue accessing the 128 bytes of internal RAM on Nestopia and puNES. More accurate emulators like Mesen and FCEUX, along with my dev cartridge, work just fine with using the Address ($F800) and Data ($4800) ports. However, when I try accessing the RAM on Nestopia and puNES, it just returns $48 for every address (open bus?) and doesn't play the test tone. I've included a (very much not finished) version of the test program that includes a couple tests for the Internal RAM (there's an invisible menu on the first screen).
I was wondering if anyone here knows about how these emulators handle emulating Namco 163 and how accessing the RAM works so I can write my code to work more universally.
Statistics: Posted by Zynidian — Wed Jul 24, 2024 1:58 pm — Replies 6 — Views 166