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

[mike at borncoco.com]

I've come full circle and am recreating the original problem. I replaced the bad floppy drive. I have a single floppy, terminated, jumper set to D0. I am able to format and write to the floppy without issue. I reconnected the CoCo-SDC and do the following:

DRIVE 0,OFF
DRIVE 1,"MIKE.DSK"

I run "DIR 0" and I see the floppy directory.
I run "DIR 1" and I see the SD-CARD image.

At this point, when I do a "DIR 1" The floppy drive motor does not run and the LED does not illuminate. The DRIVE command shows that drive 0 is "OFF" and Drive 1 is mapped to "MIKE.DSK".

Now, I run "BACKUP 0 TO 1".

Drive 0 LED lights up and I hear the head move 5 tracks while reading. Then the LED goes out on drive 0, the CoCo-SDC LED never lights up. Drive 0 continues to run until the "?IO ERROR". 

At this point, if I issue the "DRIVE" command, an "?SN ERROR" is returned. If I issue a "DIR 1", the dive 0 motor starts, but the LED does not light up.

Its not clear why SDC-DOS stops functioning at this point. Could this still be a wiring issue with the real floppy?


-----Original Message-----
From: "Gene Heskett" <gheskett at wdtv.com>
Sent: Friday, February 27, 2015 2:45pm
To: coco at maltedmedia.com
Subject: Re: [Coco] Can't copy real floppy to CoCo-SDC on a CoCo 2

How do the drives activity led's behave? is there any time in the attempt 
where both are on at the same time?  In which case I would verify that both 
drives are indeed jumpered to be drive 1's only.