[Coco] Can't copy real floppy to CoCo-SDC on a CoCo 2

[camillus.b.58 at gmail.com]

Hi, did you chck the powersupply, is the mpi stable enough?

Also the buffering schould be checked, maybe on of the logic gates went beserk?

I would try to replace those.I remember from old thar a 7402 or 7404 on my diskcontroller went out a couple of times, why nobody knew, just replaced it a cuple of times and I was back on the wagon.


Just my 2 pennies worth of thoughts…


cb








Sent from Surface





From: K. Pruitt
Sent: ‎Saturday‎, ‎February‎ ‎28‎, ‎2015 ‎12‎:‎55‎ ‎PM
To: CoCoList for Color Computer Enthusiasts






>>>
>>
>>
>> I just tried using an unmodified 26-3124 MPI with a 16K CoCo 2 and a 64K
>> CoCo 2. There were no problems using BACKUP 0 TO 1 to copy from an FD-501
>> floppy (slot 4) to the SD card (slot 1).
>>
>> You have identified your MPI as being the problem, but I don't think it's
>> the UNMODIFIED status at issue. There is something else wonky about that
>> MPI but it's not clear to me what it could be.
>>
>> - Darren
>>
>> -- 
>
> I have an unmodified 26-3124 and an unmodified 26-3024.
>
> The SDC seems to work perfectly under Basic with the 3124, but hangs when 
> trying to boot NitrOS9 and stock OS9.
>
> However, I didn't try the backup thing that Mike is having problems with 
> as I don't have a physical drive 1 any longer.  But I did backup a disk 
> from the SDC to a physical drive 0 and then back again. without issue 
> using a 3024 MPI.
>
> The unmodified 26-3024 works perfectly with the SDC and allows full 
> functionality under Basic, NitrOS9 and stock OS9.
>
> So yeah, definitely something is up with the 3124.  But I also thought it 
> was due to not having the MPI upgraded, but now that we see the problem 
> with the 3124 and a Coco 2 that kind of rules it out.
>
> The 3124 is simply wonky.
>
>
>
>
> -- 

Also, aren't there two variations of the 26-3124?  A 26-3124 and a 26-3124A?

I'm not sure what the difference is, or even if the tag says 3124A or not. 
But mine is a 26-3124 without an A designation according to the label on the 
bottom of the MPI

Not sure if this is any help or not, but I thought I'd throw it out there 
for consideration.



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