Re: Recode to Play MP3?

["Michael J. Mahon" <mjmahon@aol.com>]

georg.bieling@gmail.com wrote:
> On May 23, 11:21 am, "Michael J. Mahon" <mjma...@aol.com> wrote:
>
> > Actually, it cannot safely cache "sub-bank-switched" regions of memory
> > without "knowing" their bank-switch protocols, and, unfortunately, the
> > $C800-$CFFE region is such a sub-bank-switched region.  If it could be
> > made slot-specific, and the cache logic took the slot that originated
> > the /IOSTROBE into account, it could work, by disabling caching of the
> > extension space when switched in by certain slots.  I don't know of any
> > accelerators that go to this length.
>
>
> Even then, a Videx Videoterm for example would not work, because tha
> video RAM is bank-switched in 512 byte chunks into this c800.cfff
> area.

Using the approach I suggested, this would work if the slot were
marked "slow"--meaning never cache its slot ROM area or the expansion
ROM space if enabled by this slot.

*Any* card-specific bank-switching, RAM or ROM, would have to disable
caching, since the accelerator would have no way of knowing how the
banks were switched.

-michael

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