[Coco] SuperIDE and floppy disk

[Gene Heskett]

On Thursday 09 May 2013 12:36:06 Luis Antoniosi (CoCoDemus) did opine:

> ? PEEK(&HFF90) gives me 126.
> 
$FF90 is NOT the MPI, $FF7F is its slot selection logic.

> So the kit is there.

Not by that data, you were looking at the GIME.
> 
> On Thu, May 9, 2013 at 12:23 PM, Gene Heskett <gheskett at wdtv.com> wrote:
> > On Thursday 09 May 2013 11:59:07 Retro Canada did opine:
> > > i am using 51 and not $51
> > 
> > Which translates to $33, or slot 4.  Exactly as if you had powered it
> > up with the switch set to 4.
> > 
> > The problem with coco3's and MPI's in that the coco3 writes to the
> > GIME's memory mapping registers in the $FF90-$FF9F block.  But the
> > address decoder in the MPI is as usual for tandy, very very
> > incomplete, and those writes also get decoded to the MPI's slot
> > select logic at $FF7F.
> > 
> > The CoCo3 fix kits fix that, so a screen change on the coco3 doesn't
> > muck with the MPI's slot select.
> > 
> > > but i have fdc (4), superide (3), orch90(2) and s/sc on (1)
> > 
> > Do you know for a fact that none of the above carts share an I/O
> > address, which is normally done in in 4 byte wide pieces, the FDC
> > being addressed at, depending on which register in the FDC chip is
> > being addressed, $FF40 to $FF43, and the drive control logic is at
> > $FF48.  But because of the defective address decoding, the FDC
> > registers also appear at $FF50-FF53, and the drive control logic at
> > $FF58.  Because of this, no other pack can have an address below
> > $FF60.  That leaves IF the packs are fully decoded, room for only 7
> > devices out of the whole menagerie of carts we actually have, many of
> > which paid zero attention to staying within a 4 byte block for their
> > address usage.  The WP-RS I have, had an unused gate in it that can
> > be used to restrict it to one 4 byte wide block, but as OOTB, it uses
> > the top two byte of the $FF64 block, and the bottom 2 bytes of the
> > $FF68 block.
> > 
> > I don't own a superide, or an orch90, and I haven't plugged in my s/sc
> > in at least 15 years, so I have no idea where they are physically
> > addressed.
> > 
> > So I think you can see that you are dealing with a minefield, and the
> > first thing you'll need to do is make sure that kit is installed in
> > your MPI, and then adjust the address decoding, and the driver
> > software both, if there are any addressing clashes in your setup.  It
> > sure sounds like there is from here.
> > 
> > 
> > 
> > 
> > Cheers, Gene
> > --
> > 
> > "There are four boxes to be used in defense of liberty:
> >  soap, ballot, jury, and ammo. Please use in that order."
> > 
> > -Ed Howdershelt (Author)
> > My web page: <http://coyoteden.dyndns-free.com:85/gene> is up!
> > My views
> > <http://www.armchairpatriot.com/What%20Has%20America%20Become.shtml>
> > "Even more amazing was the realization that God has Internet access. 
> > I wonder if He has a full newsfeed?"
> > (By Matt Welsh)
> > A pen in the hand of this president is far more
> > dangerous than 200 million guns in the hands of
> > 
> >          law-abiding citizens.
> > 
> > --
> > Coco mailing list
> > Coco at maltedmedia.com
> > http://five.pairlist.net/mailman/listinfo/coco


Cheers, Gene
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
My web page: <http://coyoteden.dyndns-free.com:85/gene> is up!
My views 
<http://www.armchairpatriot.com/What%20Has%20America%20Become.shtml>
In every non-trivial program there is at least one bug.
A pen in the hand of this president is far more
dangerous than 200 million guns in the hands of
         law-abiding citizens.