SpritesMind.Net

Speaking with TmEE, I think that tools for the Z80 may be useful. You'll find lots of docs on www.z80.info. Especially the assembler as80 (v1.1.1) for DOS. Don't forget to launch it with the -x flag. and the user manual "Zilog Z80 CPU user manual (PDF)". You'll find it as um8080.pdf on the Internet....

I'm not sure to have understood everything. Let me sum it up. You want to save something in Save RAM, or static RAM, which should be present on a cartrige with a backup, don't you ? Reading SRAM, I thought you were refering to Vertical Scroll RAM or Scroll RAM !!! Is SRAM a feature of the genesis ? ...

Hi you all ! The Saturn Coding Contest takes place on the 31/12/2006. Some times ago, was speaking with Kaneda about going on the GBA scene. But GBA is nothing more that a genny with a brand new CPU (man ! 32 bits RISC !!!) and rotate/scale VDP. I may dev on GBA. But talk about saturn : bi-processor...

OMG !!!
I've tried to plot a pixel all the day long (my boss won't be happy !) and ... nothing ! drawing a single plot takes me 350 cycles, with some bugs still, and I'm far, very far indeed from Stef demo (man! 10fps with the cube)
Guess I have missed something ...
I'll post later.

I've read some docs again and again and yes, it's true.
The Z80 (separated or not) is present on all models of genny. Sorry for misunderstanding.

Stef wrote:If you like 3D processing you should have a look here :
http://www.spritesmind.net/_GenDev/foru ... c.php?t=14

I currently am !!!
Great lib !!!
Definitively !!

I am writing an ASM routine to plot a pixel.

Thank you so much Stef.
(I'm speaking with THE stef !!!)

Fonzie wrote: -For EXTRA-SHORT transfers (like 4tiles), use 68K
-For MEDIUM transfers, use DMA

Your advise is to use 68k for 4 tiles (128 bytes). But the CRAM is 128 bytes. So, to reload CRAM during active display, I could use 68k, couldn't I ?

I've been thinking on a way 3D processing could be done with parallel processing. I'll post it tomorrow.
Beware of data transfer : I've read that 68k and Z80 can not access 68k memory bus meanwhile. Can someone confirm it ?
The bus arbitrer (IC-4 on schematics, 315-5364) ensure that it's not the case.

I' ve talked with Kaneda some times ago about an emulator with debugging skills. He told me that Gens wasn't able to do it. I've walked around since and found retrodrive, from Tim Meekins, and it allows debugging. link : http://www.tmeekins.com/ hope it helps. But Gens and Kmod are still my prefered...

Thanx da Fonz.
BTW, great work on EQNox.
It confirms what I'm thinking : Genny DMA isn't that intersting.

[edit]I've made a mistake. It was the Z80, and not the DMA (!!!) that was cut from the Genny 3 !!![/edit]

Hope it helps. I have managed to run the Z80. sega16 (www.sega-16.com) says EA has done it with LHX and M1 Abrahams. So, here it is. First of all, you write a program for the Z80, let's say a loop that increment a value 15 times : LD A,15 ; ... LD (402h),A ; int *counter = 0x402; ; *n = 15; JR Z,18h...

Hi you all. I'm wondering a silly question : is DMA useful ? I'm talking about DMA 1 : transfer data from ROM/RAM to VRAM, not DMA-fill or DMA-copy. Charles McDonalds says the 68000 is frozen until the DMA is finished. So, when you're DMAing, that's the only thing you do, and that's the only thing y...

I'd like to point this : I've currently seen great members on this forum.
cdoty,
plee,
stef,
mask,
pascal
fonzie
et kan ...

How honored I am to post with you guys !

ob