Search found 25 matches
- Thu Apr 08, 2010 11:42 am
- Forum: Hardware
- Topic: Sega Saturn keyboard
- Replies: 0
- Views: 10644
Sega Saturn keyboard
So a while back I acquired a copy of the interesting-looking "Game Basic for Sega Saturn". It came with a pair of manuals (all in Japanese), game CDs, a cable to allow you to connect the Saturn's "Communication Connector" to a PC's parallel port, and the really interesting bit: a keyboard with a Sat...
- Thu Apr 08, 2010 11:35 am
- Forum: Hardware
- Topic: Everdrive-MD Flash Cart
- Replies: 24
- Views: 34840
- Thu Apr 01, 2010 9:19 am
- Forum: Video Display Processor
- Topic: Understanding the VDP's scrolling capabilities.
- Replies: 67
- Views: 78975
I notice that Sheath likes to use the term "independently scrolling background" or "independent layer", but I'm not sure he knows what it means. The Megadrive has two independently scrolling background layers, called Scroll A and Scroll B. The scrolling effect in e.g. the Sonic games is not addition...
- Fri Mar 26, 2010 11:00 am
- Forum: Video Display Processor
- Topic: Undocumented VDP commands
- Replies: 11
- Views: 9294
Thanks for reminding me about CD1-0=%10 setting the registers, I apparently had a brain fart and forgot about that one. That means I can fill in my list some more. CD3-0=%0000: VRAM read CD3-0=%0001: VRAM write CD3-0=%0010: VDP registers write CD3-0=%0011: CRAM write CD3-0=%0100: VSRAM read CD3-0=%0...
- Thu Mar 25, 2010 12:52 pm
- Forum: Video Display Processor
- Topic: Undocumented VDP commands
- Replies: 11
- Views: 9294
- Wed Mar 24, 2010 9:28 am
- Forum: Blabla
- Topic: Games for porting to SMD
- Replies: 21
- Views: 16852
- Mon Mar 22, 2010 11:35 pm
- Forum: Regen
- Topic: Regen 0.972 and 0.972D
- Replies: 193
- Views: 364156
I think feature: Color Borders for Mega Drive will be very cool for Regen, and also color dots like on real thing ;) Pointless. What you see is what you'd get on the real hardware. http://img707.imageshack.us/img707/1573/cramdots.png Behold, CRAM dots on real hardware. (This is from my capture card...
- Sat Mar 20, 2010 7:51 pm
- Forum: Video Display Processor
- Topic: Undocumented VDP commands
- Replies: 11
- Views: 9294
Undocumented VDP commands
In the documentation for the VDP in sega2 the following set of values for the bits CD5-0 are given with the resulting effect when they're used in a VDP command. CD5-0=%000000: VRAM read CD5-0=%000001: VRAM write CD5-0=%000011: CRAM write CD5-0=%000100: VSRAM read CD5-0=%000101: VSRAM write CD5-0=%00...
- Wed Mar 17, 2010 2:01 am
- Forum: Megadrive/Genesis
- Topic: DMA instruction from RAM
- Replies: 3
- Views: 3843
DMA instruction from RAM
The Sonic games (and as I understand it many other games too) follow the advice given in sega2.doc to put the final command word into RAM when initiating a DMA transfer. However, I recall reading somewhere a discussion about a particular game which uses DMA transfers just fine, but doesn't use RAM a...
- Tue Mar 02, 2010 11:15 am
- Forum: Megadrive/Genesis
- Topic: Official Sega Documentation, More is required?
- Replies: 11
- Views: 8593
To be honest I'm not certain they'd have anything that would be worth our time. I guess it would be interesting to know what sample code they provided in their SDK, but I doubt there'd be any interesting hardware knowledge. Either way I'm not sure it would be worth the fee they'd want to levy for it...
- Wed Feb 24, 2010 1:48 am
- Forum: Sound
- Topic: New Documentation: An authoritative reference on the YM2612
- Replies: 865
- Views: 2335791
- Sat Feb 20, 2010 10:02 pm
- Forum: Mega/SegaCD
- Topic: MultiBIOS question
- Replies: 3
- Views: 6999
- Sat Feb 20, 2010 8:25 pm
- Forum: Mega/SegaCD
- Topic: MultiBIOS question
- Replies: 3
- Views: 6999
MultiBIOS question
I'm collecting hardware for the Megadrive for development work, and I'm trying to make sure that I'm well-prepared to deal with pesky region lockout and other such things which have no business existing on a console which hasn't seen an active commercial development in fifteen years. My MD1 arrived ...
- Tue Feb 13, 2007 8:47 am
- Forum: Super 32X
- Topic: 32x "security code" reverse engineered
- Replies: 27
- Views: 48208
SNASM68K for XP can be found at drx's site. SNASMSH2 can be found at Bart Trzynadlowski's site.
For purely 68k work, however, I recommend AS.
For purely 68k work, however, I recommend AS.
- Mon Feb 12, 2007 3:52 pm
- Forum: Super 32X
- Topic: 32x "security code" reverse engineered
- Replies: 27
- Views: 48208
This is probably going to seem like rampant nitpicking, but I'd suggest the reason you're having trouble with MOVEM is because you're writing it wrong.
To invent an example, should be
To invent an example,
Code: Select all
movem.l d0/d7/a0/a6,-(sp)
Code: Select all
movem.l d0-d1/a0-a6,-(sp)