[Coco] SuperIDE and floppy disk

[Retro Canada]

i am using 51 and not $51

but i have fdc (4), superide (3), orch90(2) and s/sc on (1)

Sent from my iPhone

On 2013-05-09, at 5:47 AM, Gene Heskett <gheskett at wdtv.com> wrote:

> 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
>>> 
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> 
> 
> Cheers, Gene
> -- 
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