Search found 86 matches
- Thu May 25, 2017 8:18 am
- Forum: Mega/SegaCD
- Topic: SEGA CD Mode 1
- Replies: 57
- Views: 354972
Re: SEGA CD Mode 1
You can use the HV counter to introduce a psuedorandom number into track selection.
- Fri Apr 21, 2017 4:11 am
- Forum: Collaboration
- Topic: My mate is producing a musicdisk
- Replies: 5
- Views: 12547
Re: My mate is producing a musicdisk
I'd contribute one, I guess?
- Mon Apr 17, 2017 6:08 am
- Forum: Demos
- Topic: OVERDRIVE II
- Replies: 29
- Views: 48733
Re: OVERDRIVE II
Model: MD1 VA2 JP Serial: 89N51082 No pic of VDP/ASIC, but it's nothing out of the ordinary. Glitches experienced: With VDP Debug register blending stuff enabled, sprites showed blank or glitchy columns every 8 pixels; looks like a driving conflict or open bus behavior. Matches what I've seen with p...
- Sun Apr 16, 2017 6:27 pm
- Forum: Demos
- Topic: OVERDRIVE II
- Replies: 29
- Views: 48733
Re: OVERDRIVE II
This turned out great! Runs a little funny on my VA2 JP Model 1, as "that register" has some odd vertical lines every pixel on the very original chipset.
- Fri Apr 14, 2017 6:31 pm
- Forum: SGDK
- Topic: SRAM with 4MiB game?
- Replies: 1
- Views: 2599
SRAM with 4MiB game?
I am anticipating that my game will grow larger than 2MiB. From what I can gather, a typical arrangement for a <=2MiB game is that SRAM is mapped to the upper 2MiB of addresss space while the ROM is mapped to the lower 2MiB (starting at 0x000000). For a game that has grown considerably, does SGDK ha...
- Thu Jul 21, 2016 5:48 pm
- Forum: Hardware
- Topic: Hmmmm.......?
- Replies: 25
- Views: 48071
Re: Hmmmm.......?
I missed this thread until now. I'm very interested in your cartridge as well. I have a great capture card and can test anything for you.
- Thu May 19, 2016 9:34 pm
- Forum: SGDK
- Topic: Sound analyzer
- Replies: 10
- Views: 7626
Re: Sound analyzer
If you can read the digital output data, you're still going to have to implement a fast-fourier transform and generate visuals with that. You would be better off reading the registers of the YM2612, and reading the frequency and multipliers of all modulators to determine mathematically the response ...
- Fri Apr 01, 2016 3:45 pm
- Forum: UMDK
- Topic: Visible graphics problems on SGDK-based game
- Replies: 20
- Views: 28991
Re: Visible graphics problems on SGDK-based game
Yes, all NTSC. I'd believe it's a timing issue, and the later Genesis 2/3 has different timings than the first Genesis. My Genesis 1 also has problems showing Stef's Bad Apple demo. The audio will develop serious issues about thirty seconds in, give or take. It's not perfectly consistent. I would be...
- Sun Mar 27, 2016 10:26 pm
- Forum: UMDK
- Topic: Visible graphics problems on SGDK-based game
- Replies: 20
- Views: 28991
Re: Visible graphics problems on SGDK-based game
I brought my Genesis 3, and sure enough UMDK has no problems on it.
- Thu Mar 03, 2016 7:28 pm
- Forum: UMDK
- Topic: Visible graphics problems on SGDK-based game
- Replies: 20
- Views: 28991
Re: Visible graphics problems on SGDK-based game
I am going to get my hands on my old Genesis 3 soon, which may produce different results. I haven't noticed any sound issues, but I wasn't listening for those as carefully as I was looking for graphical problems.
- Sun Feb 14, 2016 9:55 pm
- Forum: UMDK
- Topic: Visible graphics problems on SGDK-based game
- Replies: 20
- Views: 28991
Re: Visible graphics problems on SGDK-based game
mswan's UMDK kit works and produces the exact same problems that mine does with regards to minor corruptions in DMA transfers.
- Sun Feb 14, 2016 9:37 pm
- Forum: UMDK
- Topic: UMDK manufacturing, part 2: Software
- Replies: 253
- Views: 263275
Re: UMDK manufacturing, part 2: Software
Sure enough, that did help. We're going through the last tests now.
- Sat Feb 13, 2016 10:31 pm
- Forum: UMDK
- Topic: UMDK manufacturing, part 2: Software
- Replies: 253
- Views: 263275
Re: UMDK manufacturing, part 2: Software
I may not have been clear enough in my post, but I stated that if I use my PCB (as opposed to his) it works without any issues. I've tried it as root, which didn't help. I will see if hwinfo shows anytihng useful though.
- Sat Feb 13, 2016 12:22 am
- Forum: UMDK
- Topic: Visible graphics problems on SGDK-based game
- Replies: 20
- Views: 28991
Re: Visible graphics problems on SGDK-based game
Okay, so I did some testing and found some commercial games with the exact same problem. Sonic 3 has Sonic's sprite tile data loaded into VRAM whenever his frame changes, and there are similar speckles of wrong data in place, indicating a DMA corruption. Interestingly the palette data is rewritten e...
- Fri Feb 12, 2016 11:57 pm
- Forum: UMDK
- Topic: UMDK manufacturing, part 2: Software
- Replies: 253
- Views: 263275
Re: UMDK manufacturing, part 2: Software
I have been working with mswan to get his UMDK board working. Unfortunately, we're stuck here: http://i.imgur.com/Obi19ZH.png On my UMDK, this command is fine, so it's not a problem with udev rules or any such configuration. Voltages all check out as fine on the board, and the Cypress device does en...