Search found 410 matches

by ob1
Thu Jan 13, 2011 7:49 pm
Forum: Megadrive/Genesis
Topic: Attention: Noob on deck.
Replies: 5
Views: 2611

I've learned Genny with your site Pascal !
by ob1
Fri Oct 15, 2010 7:59 am
Forum: Blabla
Topic: Behold the students
Replies: 7
Views: 3405

Eke wrote:hehe, excellent :D
what is the level (license,master, engineer, ..) of your students ?
L3 MIAGE
Tu parles si c'est loin de la programmation ASM !?!
by ob1
Thu Oct 14, 2010 7:57 am
Forum: Blabla
Topic: Behold the students
Replies: 7
Views: 3405

Behold the students

Hi you all ! In my spare time, I'm actually a kinda teacher. And as it happens, I have students ! Usually, the only projects they get from me are some dumb and silly IT ones. But this year, hold your breath, the university has allowed me to give them a much more technical project. And guess what ? I...
by ob1
Tue Jul 27, 2010 7:47 am
Forum: Demos
Topic: Interesting article on VRAM (and memory) management
Replies: 1
Views: 1646

Great ressource !!!
by ob1
Thu Apr 01, 2010 7:46 am
Forum: Video Display Processor
Topic: Understanding the VDP's scrolling capabilities.
Replies: 61
Views: 25848

tomaitheous wrote:Troll, sir? No, sir.
:DDD

Aaah, Tom ! Wherefore art thou tomaitheous !

:DDD
by ob1
Thu Mar 04, 2010 8:11 am
Forum: Super 32X
Topic: Super VDP
Replies: 167
Views: 90650

I didn't think about that, but intended to write no 0x00 on backgound anyway.
by ob1
Wed Mar 03, 2010 3:44 pm
Forum: Super 32X
Topic: Super VDP
Replies: 167
Views: 90650

Registers to FrameBuffer

All Right. I have one tile line (ie, 8 pixels from a tile) in 2 registers (for example, R1 and R2), and I want to put them in FrameBuffer (the address where I want to put them is, let's say, in R8). This is needed if I intend to do some scrolling. Here's how I can do, depending on the addresse modul...
by ob1
Sun Feb 28, 2010 9:58 am
Forum: Super 32X
Topic: DMA and cache
Replies: 1
Views: 2651

DMA and cache

Wandering on Bit-Blit, I asked myself something I could not answer. When reading SDRAM from SH2, reads are done by 8 16-bits words burts, due or for the cache. But how does this run for DMA ? SH2 has a DMAc, which is mainly used for DREQ, from 68k to 32X, or for PWM (never really used if I got it ri...
by ob1
Fri Feb 19, 2010 10:33 am
Forum: Video Display Processor
Topic: Color counts per screen
Replies: 137
Views: 41442

The way I see it, boosting the Color palette, perhaps with a 32X style video output overlay or plain replacement was more important than sprite zooming or another 68000. Back in these - good - old days, SNES was impressive thanks to its mode 7. Early 3D was all the rage. Let's remember that the SNE...
by ob1
Thu Feb 18, 2010 12:27 pm
Forum: Video Display Processor
Topic: Color counts per screen
Replies: 137
Views: 41442

It wraps at 0x7f because CRAM size is 128 bytes (0x80) to hold 64 (16x4) color values , each taking 16-bits in memory (as CRAM bus is 16-bits wide) so 0x40-0x7F region IS used by colors 32-63 . There is no wasted memory in CRAM other that those unused bits in each word but still, you could never ha...
by ob1
Thu Feb 18, 2010 10:08 am
Forum: Video Display Processor
Topic: Color counts per screen
Replies: 137
Views: 41442

Well, it seems to me that the debate as long gone away from colours count per screen, so I will have my few points : - I think (and that's only my opinion) that backward compability became relevant only later. There and then, backward compability was quite a new feature (brought by the PC world), an...
by ob1
Wed Jan 20, 2010 8:06 am
Forum: Video Display Processor
Topic: Sprite Table Address Wierdness
Replies: 16
Views: 7331

offtopic : great topic, great explainations.
by ob1
Tue Aug 11, 2009 7:51 am
Forum: Super 32X
Topic: Debugging Features of the Xmen game
Replies: 4
Views: 3491

(I once had a similar screen with Madden '92. It looked a core dump)
by ob1
Tue Jul 21, 2009 1:13 pm
Forum: Super 32X
Topic: Shared Memory
Replies: 16
Views: 7772

Not that bad.
Check this for the 32X "OCRed" docs.
Cheers,
Oli
by ob1
Tue Jul 21, 2009 6:40 am
Forum: Super 32X
Topic: Shared Memory
Replies: 16
Views: 7772

The 68k writes data in the DMA Data Port (1 16-bits word),
the SH2 DMAC reads from it
and stores it where designed.