Jim Westfall
Jim Westfall
z80 ram is tested when you hold down 'D' at power-on with a diag m1 cart. Once the diag m1 has validated the ram it will start using it for...
Yes that sounds correct with the latch being in the NEO-C1.
Writes to P2 are mostly used to trigger bank switching of the P roms. If P2 is unwritable the most likely symptom would be the game crashing. Even though there...
I would see where the pulsing stops along that path. If you see it going into a 244 and not coming out its probably something related to the 244. Just...
You are seeing the pulse on the PORTWEL/U test points on the diag prog board? Does the issue happening all slots or just slot 1? Have you cleaned the slots?
The way the write test work is this 1. read word from memory location 2. flip the bits of the word 3. write the flipped word to the same memory...
- not sure its worth the hassle to add the sound stuff if you can just use an original/unibios? - dip switch info is in the "MISC. INPUT TEST" section...
The original bios uses the onboard SM1 rom for those sound tests and does not interact with the m1 rom on the cart at all. What error do you get?...
Hi, Thats a cool project. I don't do much development on the diag bios unless someone asks for a feature or finds a bug. If you still want to send...
Hi Thanks for the issue. I wasn't able to reproduce the issue, but I think thats because I already found/fixed it in fcaa64787985edb84a4483efe9f9c699bdc40285 a few months ago. I don't do...