From: Maciej Witkowiak (ytm_at_elysium.pl)
Date: 2002-08-22 15:05:05
ruud.baltissen@abp.nl dnia 21 sie 2002 o 13:55 +0200 napisa³:
> Now someone has to write an OS for it. And that will cost time....
I just have to remind that for GEOS anyone can use my CIAIDE[1] code and tune it
to his own wiring scheme. I dropped the idea of supporting it under
Basic/Kernal because it means writing whole new DOS and it would take too much
memory. Only additional ROM and patched Kernal would be an option.
> The only way one can address such a drive is using the Kernal. So any
> program addressing a IEC-drive using its own routines never will see the HD.
> I cannot afford to spend time to such an incompatible device :(
>
> Idea: hack the one of IDE64 :)
Hacking IDE64 rom is easy, but one would have to reproduce IDE64 cartridge
system. It is quite smart - when in Basic mode IDE64 is seen only in $de00-ff
area and some Kernal vectors in $03xx are changed. When needed, during disk
I/O parts of ROM or RAM from IDE64 may be turned on in upper memory area. At
least some parts of this setup have to be remade.
As for compatibility I think the right way is to have a separate device on IEC
bus. Be it something new or hacked 1541.
ytm
[1] http://members.elysium.pl/ytm/html/ciaide.html
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