> >> 1 SP ? Sprite (0=On, 1=Off)
> >
> >The name is SPD, not SP. With it you can disable the sprites, which
> >drastically spees up the VDP (that's why the name is SPeeD).
Well as Manuel said SPrite Disable is indeed more logical. Sorry.
Anyways, it's SPD, not SP.
> >> 2 VR0 VRAM size and speed
> >
> >It's the VRAM mode.
> >
> >According to my docs it has to be 0 (it has no value), but when looking
to
> >the meaning of the 3rd bit I think you can switch between 1 and 4-bit
VRAM
> >with this. On MSX always keep it 0!!!
>
> OK. I prefer to poke values directly to VDP registers instead of reading
> the shadow, mask and modify the bits I want provided I know exactly what
> I'm doing!
Hmmm... I always load all the shadowregisters in a table of 28 bytes called
VDP.
If I want the value of register 8 I execute LD A,(VDP+8)... Very useful.
But I don't save all registers everytime I save them, hell no. Only
registers like 0, 1, 8, 9 etc.
> >I don't know what the value on MSX is, I guess it has to be 1 all the
time.
> >You can check the value by doing PRINT RIGHT$("0000000"+BIN$(VDP(8)),8)
in
> >Basic.
>
> 1 indeed.
Once again I was right :)
> >> 4 CB colour Bus direction (0=Output, 1=Input)
> >
> >This one can also have 1 value, otherwise the VDP won't work (it might
even
> >blow up!).
>
> OOPS! Same seems to go for PSG register 7. 10xxxxxx or BANG!
>
> The first time I laid my hands on an MSX I POKED the PSG register 7
> directly... with 00xxxxxx!!! My 8250 sounds real bad when doing phaser
> effects, so I presume perhaps I blowed something with that POKE?!?!?
Yeah I know about PSG R#7. But I don't think changing this bit (CB) will
blow something up. I have never heard about it. But it IS a possibility...
that was my point.
> >> 5 TP ?Transparent from palette
> >
> >If this bit is set color 0 isn't transparent anymore. As far as I know
this
> >only affects the sprites. You know the use of it, don't you?
>
> Yeah. I actually ABUSE this bit.
Owww... this is terrible. Is there a number to call for Bit-Abuse??? (My
father always threatened me to call the father-phone if I hit him -not hard-
when I was a little kid).
~Grauw
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