At 19:50 20-6-00 +0200, you wrote:
>On Tue, 20 Jun 2000, Mauricio Braga wrote:
>
> > It will be nice if this advanced VDP could be full compatible with the
> v9958,
> > including
> > timing, etc, and extending it by using screen13,14, etc... with millions of
> > colours and resolutions
> > like 640 x 480 and others. Anyone knows what ESE is planning for this VDP?
>
>Maybe a greater advance in the new MSX graphics scheme would be RAM-mapped
>VRAM (it is VRAM being directly accesible by the CPU). In this way, all
>VRAM access by the CPU would be MUCH faster: just put the value you want
>where you want, instead of OUTing the address and then the value. Also,
>the new VDP should have its own address space mapped to this VRAM, so both
>the CPU and the VDP can access this memory, thus keeping
>backwards compatibility with older generations, and making the new MSX
>video structure much faster.
I don't think that is such a good idea, because of accidentally overwriting
vdieo-data with other data and you could get an access conflict between CPU
and VDP when they try to access both at the same time. It's pretty hard to
get that working properly and even still... timing, as for a game timing is
everything.
GreeTz, BiFi
Visit my Home Page at www.bifi.msxnet.org
mail me at: [EMAIL PROTECTED]
FTP: ftp.bifi.msxnet.org
ICQ #36126979
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