Search found 6 matches
- Wed Mar 24, 2021 9:24 am
- Forum: Super 32X
- Topic: Questions on emulating the 32X
- Replies: 14
- Views: 245485
Re: Questions on emulating the 32X
About DMA flag. I think, 32X logic monitors the address bus (VA) for a DREQ source address register match and then captures data from the data bus (VD). Hmm, so it only works from a fixed source address then? Looks like an address match serves as a trigger to start the DMA. You can find the source ...
- Wed Mar 24, 2021 9:01 am
- Forum: Super 32X
- Topic: Questions on emulating the 32X
- Replies: 14
- Views: 245485
Re: Questions on emulating the 32X
Oh that's bad. I was faking it as always being accessible currently. Initial attempts at it were breaking games and tests. I'll pay closer attention to getting it working then. But, DRAM refresh? Really? So every time there's a CPU DRAM refresh it has to go inaccessible for short bursts? That's ......
- Mon Mar 22, 2021 7:23 pm
- Forum: Super 32X
- Topic: Questions on emulating the 32X
- Replies: 14
- Views: 245485
Re: Questions on emulating the 32X
Some games require proper FEN flag emulation (including DRAM refresh).
After Burner uses UBC registers as variables for sound processing.
About DMA flag. I think, 32X logic monitors the address bus (VA) for a DREQ source address register match and then captures data from the data bus (VD).
After Burner uses UBC registers as variables for sound processing.
About DMA flag. I think, 32X logic monitors the address bus (VA) for a DREQ source address register match and then captures data from the data bus (VD).
- Tue Feb 23, 2021 4:06 pm
- Forum: Super 32X
- Topic: 32x "security code" reverse engineered
- Replies: 27
- Views: 51579
Re: 32x "security code" reverse engineered
No, just area 0x70-0x73. Maybe it's a separate register.
The same register is in Sega СD and some games change it as needed.
The same register is in Sega СD and some games change it as needed.
- Tue Feb 23, 2021 3:03 pm
- Forum: Super 32X
- Topic: 32x "security code" reverse engineered
- Replies: 27
- Views: 51579
Re: 32x "security code" reverse engineered
From 32X Overview, the same as in Sega CD.
Re: DMA DEI
Some tests of Mars Check Program use the DREQ and almost all 32X hardware. And source code of Mars Check Program is in 32X-DDK.