[Coco] Floppy hardware...

[Bruce W. Calkins]

----- Original Message ----- 
From: <billg999 at cs.uofs.edu>


>> The jumpers on the TEAC 55-GFR allow for 300RPM operation, and the drive
>> will format disks, but it can't read older disks I've got that were
>> formatted and written with a true 360K drive. This seems to be a known
>> issue with these 1.2MB 5.25" drives, and I understand the general
>> recommendation is to avoid them. I'm tending to agree.
>>
>
>
> Interesting.  I have been using them for years on PDP-11's and
> TRS-80's and even the COCO (Have one on my COCO3 now.)  I have
> never noticed a problem.  I have read original TRS-DOS disks on
> them.  Might have to do with the jumper settings.  It's been a
> while since I read the specs but I am sure you need to do more
> than just change the motor speed.
>
> bill
>
===================

There are several variants within the TEAC 55-"XXX" series.  From 360k 
drives through 720k to the 1.2MB drives.  You really have to sort through 
the sub-model numbers to find THE treasured one that works with a CoCo as a 
720k drive.
Bruce W.