> > > 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
Support for it is also dropped since the MSX2+ which standarized the
location of the VDP at port #98.
~Grauw
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