(hai marcel, yer awake yet!)

If it was upto me I would still be asleep

@GhostwriterP: The pal bit is in register 7 bit 3. Set the select pal

I just might write a routine to test more accurate, more commands and more modes.
In my experience those BM** stuff were indeed even faster. However they won't work like you would expect in p modes.
Not sure about BMLL but the other two are useless.

@msd: Thanks

@ghostwriter: You need to set the address a little different then you expect in p modes. They absolutle do work. If you set the parameters correct. i think it was something like this. For layer a. shift address left one time .. so 0x10000 -> 0x20000 and for layer B shift to left and add 1 iirc. It has something to do with the banking/interleaving.

LD HL,#FF00
CALL G9k.SetCmdWriteMask

CALL G9k.DisplayEnable

LD_EHL 400000H
call G9k.SetVramWrite
LD DE,512
.clear
XOR A,A
OUT (G9K_VRAM),A
DEC DE
LD A,E
OR A,D
JP NZ,.clear

LD_EHL 400000H
call G9k.SetVramWrite
XOR A,A
LD B,0
.loop
OUT (G9K_VRAM),A
INC A
DJNZ .loop


LD HL,.copy
CALL G9k.CopyVramToVram
RET

.copy G9K_COPY_VRAM_VRAM 800000H, 82000H,256 ;

Test I did using the g9klib.. this copies 256 bytes from address 40000 to 41000. Notice that also the writemask needs to be set.. and for layer A it needs to be 0x00ff

I tried that once, you know shifting to the left, but got a 'scaled' version, like one correct byte followed by an incorrect byte. It involved something copying from B to A lineair to block. Might be I did something wrong...

This part is really badly documented in the v9990 manual.. Only a small very vague note about it

GhostWriterP: if you got any (more) data about the V9990 command engine speed, please let us know so that we can use it for openMSX. Thanks!

Quote:

This part is really badly documented in the v9990 manual.. Only a small very vague note about it

Euh? The mapping of VRAM addresses to the VRAM banks is very clearly documented. With that info you should be able to figure out how these copy commands should be set up...

The not so clear part about it is that addresses need to be set in a different way in P modes, which is never mentioned in the manual.

Back on topic.. you think the v9990 is not fast?

Concidering 5kb for copies in P1 mode, where less then one kb in vblank, it is kinda disapointing isn't it? Then you might think do you need more. Then I say think bigger than pacman or space invaders and you'll need it. (At least I do... )

well okay in p mode it's not fast with copies.. but in b modes I don't think it's bad at all.

Still not really a suprice that's it's slower in p modes dan in b. those layers and all those sprites take up quite some vram bandwidth.