>>
>>Hi people!
>>
>>Can somebody tell me if there are disk interfaces for 1.2 and
>>1.44Mb disk-drives for MSX?
>>
>>I know that the most part of the MSX in Europe uses a
>>disk-interface that runs through addresses 7FF8-7FFF. Here in
>>Brazil, the most part of them uses I/O ports D0-D4, and I know
>>exactly how to program the interface (FDC). I would like to know
>>how to program the european disk-interface. Can you help me?
>>
>Hello Marco,
>
>I have bad news to You. The memory mapperd floppy disk interface ports are
>differenly wired (thus differently programmed) in different MSX computers.
>
>I could inform you about SVI and Philips 8250.
>
>Sincerely Kari Lammassaari/Finland
>Kari & Juissi Lammassaari
>[EMAIL PROTECTED]
>
>
I can make the news a little less bad.
sony and philips have used (almost) the same design
and this is the memory layout
but it is not a msx standard !
WD1793 or wd2793 registers
adress
7FF8H read status register
write command register
7FF9H r/w track register
7FFAH r/w sector register
7FFBH r/w data register
hardware registers
adress
7FFCH r/w bit 0 side select
7FFDH r/w b7>M-on , b6>in-use , b1>ds1 , b0>ds0 (all neg. logic)
7FFEH not used
7FFFH read b7>drq , b6>intrq
set on 7FFDH bit 2 always to 0 (some use it as disk change reset)
a long time ago i have written the program "supercop" (maybe
someone still knows it ) and it did work on most msx's popular
in holland.
for this i have written a sort of fdd bios. if you want it - and
i can still find it :-) i can send it to you.
erik de boer
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