The address is &H7FF6, disable value 0, enable value 1
GreeTz, BiFi
Alex Wulms <[EMAIL PROTECTED]> schreef in nieuwsbericht
<[EMAIL PROTECTED]>:���^���^���^p��^`��^0��^...
> ] Laurens Holst wrote:
> ] > Well since the I/O ports are used and they both have mapped the same
> ] > ones,
> ] > they will probably both play the same
> ]
> ] >(unless they are used through
> ] > their
> ] > BIOS, which however rarely happens, I think only in Basic).
> ]
> ] How how how,
> ] Explain this to me please.
> ] I think you're wrong. You say yourself that they have the same I/O
> ] ports. I/O are visible on all busses of the MSX system. The BIOS is a
> ] Z80 ML prog like any other and it uses the I/O ports to talk to the
> ] MSX-Music chip. So how can the BIOS make a difference between two chips
> ] who listen to the same I/O port ????
> You can disable the I/O ports of an individual MSX-Music chip by writing a
> special value to a memory-mapped port in the Music-ROM page/range. Don't
know
> the address nor the 'disable' value by heart. You can re-enable the ports
by
> writing a different value to the same address. Furthermore, if I remember
> correctly, the ports are also mapped to memory mapped I/O. Also in the
> Music-ROM page/range. So this means that you can program the MSX-Music via
> this memory-mapped I/O as well.
>
> Though, it might be that this memory mapped I/O is not implemented in all
> fm-pac clones...
>
>
> Kind regards,
> Alex
>
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