[Coco] Citizen 3.5" 26 pin

[Robert Emery]

Give it a shot!
 
I used a low profile 26pin drive from an old NEC laptop in my portable CC3 (runs off 12v) with internal floppy drive (5v). If you compare the pinouts, you can just use the IDC connector from a PC parallel port adaptor (the one that goes from the motherboard to rear of the PC case).
 
Remove the 34 pin connector, remove a select range of wires from the middle of the ribbon cable (compare the pinouts) and crimp on the smaller connector with the correct pinout... ISTR only one wire is "out of sequence" with the normal 34 pin rig and has to cross over the ribbon. Might be misremembering this, but too tired to check now.
 
To crimp the IDC connectors, I use channel-lock pliers and popsicle sticks to prevent marring. Works great!

Peace,
Bob
 
www.geocities.com/theother_bob

----- Original Message ----
From: Joel Ewy <jcewy at swbell.net>
To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
Sent: Tuesday, August 1, 2006 8:05:05 PM
Subject: Re: [Coco] Citizen 3.5" 26 pin


The following link has a very similar pinout for a 26-pin 
floppy connector: 

http://www.eio.com/public/floppdrv/0427.html

Compare it to the teac PDF mentioned in a previous post.  
There may be some standardization in the 26-pin floppy 
interface.

I have a number of very small laptop drives with this 
interface.  I've also been thinking of trying to hook one 
up to the CoCo.  I'll try it on a more expendable PC first.  
But if it works, I could have a floppy drive that sits on 
top of a CoCo floppy controller.  That would be very nice...

JCE

  

Roger Merchberger <zmerch-coco at 30below.com> wrote:  Rumor has it that Chester A Patterson may have mentioned these words:
>I've got a couple of CITIZEN OSDC-95A 3.5" FDDs, they must be 720k only,
>as I yanked them from a old Tandy 1400LT. But they've got 26 pin
>connectors. Does anyone make a 26 to 36 pin adapter? Or have pin
>assignments? Citizen's www goes back to 1989 but not before, and I
>didn't get anything off of google. Thanks.

I found this post from google:

http://zurich.ai.mit.edu/hypermail/thinkpad/2002-09/0569.html

It looks like a few thinkpads might've used 26-pin cables...

And this TEAC floppy drive used 26-pin cables - I wonder if they're the 
same pinout:

http://www.teac.de/dspd/downloads/datasheets/dl_fd05hf8630.pdf

Dunno if this helps much, but I hope it does.

Laterz,
Roger "Merch" Merchberger

--
Roger "Merch" Merchberger   | "Bugs of a feather flock together."
sysadmin, Iceberg Computers |           Russell Nelson
zmerch at 30below.com          |


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