Maarten ter Huurne wrote:
>
> On Sun, 27 Aug 2000, you wrote:
>
> > It is possible (for Sunrise, L. Padial or other HW developers) to make
> > a MSX2+ upgrade cartridge for MSX2 (or even MSX)?
>
> I think it's impossible, because the internal V9938 and the V9958 in the
> cartridge would be at the same port address and will interfere with eachother.
It's possible and the standard has a feature called "secondary MVDP
adaptor"
that consists of a secondary I/O port for a expanded VDP. It's port 88h.
This is how the ACVS MSX2+ cartridge expands the system.
(Just like you may have 2 MSX-Audio chips in a MSX computer, you can
have two
VDPs in a MSX computer.)
Unfortunatelly MOST of the software written for the MSX doesn't support
machines that have the main VDP (the expanded VDP) in the port 88h
Cya MSXers ...
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