[Coco] SuperIDE and floppy disk

[Gene Heskett]

On Thursday 09 May 2013 05:36:34 Luis Antoniosi (CoCoDemus) did opine:

> yep poke &hff7f,51 does the job
> 
That is a pair of 2 bit registers, addressed as nibbles, $00 through $33 
are legal values.  I forget which, but one steers the slot select, the 
other steers the IRQ logic.

If all slots pin 8's have been bussed together, and 3 of the 4 pullup 
resistors that are tied to the sockets pins 8 have been cut free in the 
MPI,  Then no IRQ's will get lost, or worse yet blocked.  Highly 
recommended fix. Nitros9 is fully capable to figuring out which device 
caused the IRQ.

> thxs,
> 
> but i'm seeing it turning the drive on on a random criteria, and even
> crashing on nitros-9 s that possible there is some problem with the mpi
> or the Fdc ? removeing the fdc solves the problem.

Your $51 effectively is selecting slot 2 as its effectively a $11 to the 
MPI.  What do you have in slot 2?
 
> On Thu, May 9, 2013 at 12:16 AM, Mark Marlette 
<mmarlette at frontiernet.net>wrote:
> > Luis,
> > 
> > That is correct.
> > 
> > sIDE ROMs are decoded with SCS to get to the proper boot rom. The
> > CF/IDE/ATA/ATAPI hardware is all IOmapped so the switch is a don't
> > care on position.
> > 
> > Use MPI pokes to change...don't recall ATM, FF7F???
> > 
> > You can mod the autoexec.bas program to do this for you after it boots
> > off the ROM/CF.
> > 
> > That way you don't have to slide the switch.
> > 
> > Make sense?
> > 
> > Regards,
> > 
> > Mark
> > http://www.cloud9tech.com
> > 
> > 
> > 
> > 
> > ________________________________
> > 
> >  From: Luis Antoniosi (CoCoDemus) <retrocanada76 at gmail.com>
> > 
> > To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
> > Sent: Wednesday, May 8, 2013 9:41 PM
> > Subject: [Coco] SuperIDE and floppy disk
> > 
> > 
> > Hi,
> > 
> > I'm trying to use both, but I noticed I need to boot setting the MPI
> > to slot 3 (superIDE) and once booted set to 4 (fdc) to be able to use
> > floppy disks with DRIVE OFF or even in NitrOS-9. It will only acess
> > the disks if I set back to 4.
> > 
> > Is that correct ? I'm afraid to break the button in the long run.
> > Isn't there a poke to change the slot ?
> > 
> > thxs,
> > 
> > Luis
> > 
> > --
> > Long live the CoCo
> > 
> > --
> > Coco mailing list
> > Coco at maltedmedia.com
> > http://five.pairlist.net/mailman/listinfo/coco
> > 
> > --
> > Coco mailing list
> > Coco at maltedmedia.com
> > http://five.pairlist.net/mailman/listinfo/coco


Cheers, Gene
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