[Coco] Floppy hardware...

[Luis Antoniosi (CoCoDemus)]

for me it seems the head selection logic is different. It ends up
using the wrong side of the disk.

On Wed, Jan 15, 2014 at 9:23 AM, Christopher Barnett Fox
<cbfox01 at syr.edu> wrote:
> 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.
>
> --
> Christopher Fox
>
>
>
>
>
> On 20140115, 9:11, "billg999 at cs.uofs.edu" <billg999 at cs.uofs.edu> wrote:
>
>>> Good evening!
>>>
>>> I'm having a devil of a time building a complete 2xDSDD 5.25" floppy
>>> system for my CoCo 3. I've got a complete one-drive FD-502, and a
>>>complete
>>> one-drive FD-500 (with the 26-3029 controller).
>>>
>>> The FD-500, I discovered, only has a TEC FB-501 180K SSDD drive.
>>> The FD-502, while it has a Mitsumi D502 360K drive, has unusual power
>>> connectors ­ not the standard 4-pin Molex, and it doesn't match the
>>>4-pin
>>> mini-Molex found on 3.5" drives. The two-drive-bay enclosure has support
>>> for a second drive, but the included power connector is the same odd
>>>4-pin
>>> that doesn't match a mini-Molex.
>>>
>>> I bought a Chinon FZ-502 off Fleabay, which should be a 360K drive. It's
>>> got a standard large 4-pin Molex power connector.
>>>
>>> Is the pinout on the power connectors in the FD-500 and the FD-502 the
>>> same? Could I install the Chinon into the FD-502 case by cutting out the
>>> odd power connector and splicing in a spare 4-pin Molex?
>>>
>>> Don't even start me on the fun I had mistakenly buying what was labeled
>>>as
>>> a 360K TEAC drive on Fleabay and discovering what arrived was actually a
>>> 1.2MB TEAC-55GFR.
>>>
>>
>>Should be able to jumper that for 360K.  GFR's are very flexible.
>>
>>bill
>>
>>
>>
>>
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>
>
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