[Coco] Help with my CoCo FDD

[Walter Zambotti]

Ok guys.

I have two CoCo III a CoCo I and three FD setups.

FD1 Is a Real Tandy Controller and FDD. I haven’t used this in a while but I think it is working.

FD2 Is a Shinon FD502 slim case with a third party controller that supports 42 tracks. Used on my main CoCo III.

FD3 Is a Shinon FD502  full height case with an ugly hacked controller.  This was used on the CoCo I

Neither of the shinon FDs with either controller are working at the moment!

At the time I messed things up I was trying to get both shinon drives into the full height case.

Anyway both controllers can see both shinon drives ad I can do a DSKINI0 and they both start working but after formatting 35 tracks I get an I/O error.
So they spin up and heads move around but not reading any data.

It could be that the media is all 30 years old but I had some unused Tandy certified floppies that have also failed.

Then jumpers on the FD502 are pretty straight forward.

: : : : : :
0 1 2 3 MX Term

I checked the jumpers on the other shinon drive which are set the same just one jumper on 0.

I managed to determine that there was only 0.5 volts on the 5 volt rail which was due to a loose contact which is
Now sorted but it's still not working.

I think MX is for cable select or Always selected.  I found no clear documentation on this.

Link to images here;

https://1drv.ms/f/s!AgghqTS6bkpArCAjVbeIx1zmaOiU

It's the smaller controller FD2 that I want working.

I have also tried swapping cables in case that was issue.

Walter

-----Original Message-----
From: Coco [mailto:coco-bounces at maltedmedia.com] On Behalf Of Gene Heskett
Sent: Tuesday, 13 November 2018 1:11 PM
To: coco at maltedmedia.com
Subject: Re: [Coco] Help with my CoCo FDD

On Monday 12 November 2018 23:32:03 Walter Zambotti wrote:

> Hi guys
>
>
>
> Advance help request.
>
>
>
> I was cleaning up my FDD and a jumper fell out (from I don't know
> where!) And there are numerous jumpers on the FDD and I don't know 
> where to put it back.
>
>
>
> After that I can't read any of my FDs!
>
>
>
> I'm going to take a few pics of the thing and post them online in the 
> hope one of you guys might be able to help!
>
>
>
> Walter

Panasonic did at one time have that stuff on the web as .pdf's. But that was 20 years back too. I have an earlier factory manual on the JU-455, but its not that new so the pcb is probably different. But set that one on your scanner glass, and send me a PM as a  multimegabyte jpeg, with the scanner running at at least 600 dpi, so I can compare it with what I have. Send it to me, not the list as it will be huge.

--
Cheers, Gene Heskett
--
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page <http://geneslinuxbox.net:6309/gene>

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