Search found 197 matches
- Thu Dec 10, 2015 12:26 am
- Forum: Video Display Processor
- Topic: VDP 128Kb Extended VRAM mode
- Replies: 44
- Views: 82032
Re: VDP 128Kb Extended VRAM mode
This reminds me, the recent Megadrive Collected Works has had an interview with the Megadrive hardware designer, Masami Ishikawa, where he talks a bit about the 128Kb VRAM mode. Apparently it was added as an experiment to significantly increase performance, but in the end it unfortunately didn't. Wh...
- Wed Dec 02, 2015 2:19 am
- Forum: Hardware
- Topic: Decapping more Genesis chips
- Replies: 17
- Views: 62320
Re: Decapping more Genesis chips
On the topic of chips with internal ROMs, the DCC possibly has one as well. Although that chip only handled DRAM and Boot ROM access, so it's not that interesting. It got the task of multiplexing digital audio as well on later models.
- Tue Dec 01, 2015 6:31 pm
- Forum: Hardware
- Topic: Decapping more Genesis chips
- Replies: 17
- Views: 62320
Re: Decapping more Genesis chips
Well, I was mostly mentioning what I was told by other developers. MAMEDEV is always crying about not having info on VDP1 timings. The SCSP DSP, I don't have much documents on that, but according to Steve there are docs by Yamaha about the SCSP which I'd assume include the DSP as well. EDIT: nope, w...
- Sat Nov 28, 2015 5:35 pm
- Forum: Hardware
- Topic: Decapping more Genesis chips
- Replies: 17
- Views: 62320
Re: Decapping more Genesis chips
Of course, if you are able to do "lots" of chips, the Saturn has plenty to do: https://upload.wikimedia.org/wikipedia/commons/9/9d/Sega-Saturn-Motherboard.jpg One of the chips here is the YMF292-F, which might even be of interest for you in your project. On that topic, I have a bunch of broken satu...
- Sun Oct 11, 2015 3:48 pm
- Forum: Exodus
- Topic: Questions about emulating different Genesis models
- Replies: 8
- Views: 11745
Re: Questions about emulating different Genesis models
Oh, I have one of those. Pretty low serial too, 88M 01190. I collect odd hardware for testing too, but I don't have the knowledge to make any, but superficial tests on it, so a test app would be welcome.
- Sat Oct 03, 2015 11:54 pm
- Forum: Exodus
- Topic: Questions about emulating different Genesis models
- Replies: 8
- Views: 11745
Re: Questions about emulating different Genesis models
Perhaps I am being presumptuous here, but there should be a test program that looks for all these details that differ between hardware. Sure, there are a million and one things to test, but it could start with implementing the known differences, and give back numbers that could be used to implement ...
- Sun May 17, 2015 4:23 am
- Forum: Exodus
- Topic: Exodus 2.0 + Open Source Release
- Replies: 105
- Views: 266452
Sorry, very busy the last few days. I've made some fixes to the joystick handling code that'll be part of the next release. I'll have another look at the code and see if I can see any other problems. I don'thave a joystick or ganepad to test on so it makes it a bit hard to verify. If you have acces...
- Sat May 02, 2015 7:09 pm
- Forum: Exodus
- Topic: Exodus 2.0 + Open Source Release
- Replies: 105
- Views: 266452
- Fri May 01, 2015 7:12 pm
- Forum: Exodus
- Topic: Exodus 2.0 + Open Source Release
- Replies: 105
- Views: 266452
You know, I did actually add support for this, and I was banging my head against the wall as to why this wasn't working, and then when I did hardware tests, I found that on the systems I tested on at least, the character also wasn't random on the hardware either. Never diagnosed past that. It'd be ...
- Fri May 23, 2014 8:49 pm
- Forum: Mega/SegaCD
- Topic: Reading subcode data on the MegaCD
- Replies: 12
- Views: 30009
Everything else gets recreated by any burner. Nemesis wants to do this to rip Mega Laserdiscs - what burners can and cannot burn do not matter here. Also I think this depends on burners, both hardware and software. The subcodes used for CD+G are burnable for sure, at the very least. Not sure about ...
- Sat May 17, 2014 4:42 pm
- Forum: Megadrive/Genesis
- Topic: Sega Mega Drive/Genesis Collected Works
- Replies: 18
- Views: 16797
- Thu Jan 23, 2014 3:37 am
- Forum: Megadrive/Genesis
- Topic: Unique hardware identifiers?
- Replies: 11
- Views: 6772
The serial number should make it possible to identify the hardware inside but it just so happens that the Megadrive did not follow the standard Sega serial numbers until later. Megadrive 2 did, but it either did not do it consistently, or I just don't have enough test cases. Ok, just cracked my MD3 ...
- Tue Dec 17, 2013 10:50 pm
- Forum: Sound
- Topic: SUPER PSG (SPSG) VST SN76489 with extended features
- Replies: 4
- Views: 5759
- Thu Dec 05, 2013 8:33 pm
- Forum: Megadrive/Genesis
- Topic: GigaDrive (aka 3D-TV compatible Sega Mega Drive) specs by M2
- Replies: 8
- Views: 7437
- Thu Dec 05, 2013 1:52 am
- Forum: Megadrive/Genesis
- Topic: GigaDrive (aka 3D-TV compatible Sega Mega Drive) specs by M2
- Replies: 8
- Views: 7437
The last time I remember such a thing was when they released that Sega Ages compilation of, uh, Fantasy Zone I think. One of those SMS-only sequels. They rebuilt it to run on the original arcade hardware... to the point that you could burn the game data on eproms and it actually really ran on the ha...