Search found 25 matches

by Ketsuban
Thu Apr 08, 2010 11:42 am
Forum: Hardware
Topic: Sega Saturn keyboard
Replies: 0
Views: 3184

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...
by Ketsuban
Thu Apr 08, 2010 11:35 am
Forum: Hardware
Topic: Everdrive-MD Flash Cart
Replies: 24
Views: 22579

Probably just needing all the pins the Megadrive makes available - the 32X only passes through those pins which are needed to make games run.
by Ketsuban
Thu Apr 01, 2010 9:19 am
Forum: Video Display Processor
Topic: Understanding the VDP's scrolling capabilities.
Replies: 61
Views: 18834

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...
by Ketsuban
Fri Mar 26, 2010 11:00 am
Forum: Video Display Processor
Topic: Undocumented VDP commands
Replies: 11
Views: 3821

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...
by Ketsuban
Thu Mar 25, 2010 12:52 pm
Forum: Video Display Processor
Topic: Undocumented VDP commands
Replies: 11
Views: 3821

It was those "not known" commands I was hoping for more information on, hence the example I gave. :P
by Ketsuban
Wed Mar 24, 2010 9:28 am
Forum: Blabla
Topic: Games for porting to SMD
Replies: 21
Views: 7140

I'm told the source code for those isn't usable as source code (i.e. it would take an unacceptable amount of work to repair them for use with an assembler).
by Ketsuban
Mon Mar 22, 2010 11:35 pm
Forum: Regen
Topic: Regen 0.972 and 0.972D
Replies: 193
Views: 59975

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...
by Ketsuban
Sat Mar 20, 2010 7:51 pm
Forum: Video Display Processor
Topic: Undocumented VDP commands
Replies: 11
Views: 3821

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...
by Ketsuban
Wed Mar 17, 2010 2:01 am
Forum: Megadrive/Genesis
Topic: DMA instruction from RAM
Replies: 3
Views: 1780

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...
by Ketsuban
Tue Mar 02, 2010 11:15 am
Forum: Megadrive/Genesis
Topic: Official Sega Documentation, More is required?
Replies: 11
Views: 4023

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...
by Ketsuban
Wed Feb 24, 2010 1:48 am
Forum: Sound
Topic: New Documentation: An authoritative reference on the YM2612
Replies: 859
Views: 340201

A friend of mine does freelance translation work to make some extra cash (due to disability he's not able to get a job) and I've passed those on to him. I'll let you know what he comes up with.
by Ketsuban
Sat Feb 20, 2010 10:02 pm
Forum: Mega/SegaCD
Topic: MultiBIOS question
Replies: 3
Views: 4343

Ahh, okay, thanks for pointing that out - I'd managed to miss that. That's a relief, then - it won't affect me since I won't be changing region while the system is running.
by Ketsuban
Sat Feb 20, 2010 8:25 pm
Forum: Mega/SegaCD
Topic: MultiBIOS question
Replies: 3
Views: 4343

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 ...
by Ketsuban
Tue Feb 13, 2007 8:47 am
Forum: Super 32X
Topic: 32x "security code" reverse engineered
Replies: 21
Views: 14211

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.
by Ketsuban
Mon Feb 12, 2007 3:52 pm
Forum: Super 32X
Topic: 32x "security code" reverse engineered
Replies: 21
Views: 14211

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,

Code: Select all

movem.l d0/d7/a0/a6,-(sp)
should be

Code: Select all

movem.l d0-d1/a0-a6,-(sp)