3.5" floppy drive in IBM XT?

From: Fred Cisin <cisin_at_xenosoft.com>
Date: Mon Apr 7 22:52:00 2003

On Mon, 7 Apr 2003, Joe wrote:
> My mistake. It IS on the same controller. It didn't look like it till I got it apart.

Is it a 720K? (look for a media sensor in the drive for a quick but not
certain test) If so, then it has no need for any difference in cntroller
or BIOS than a 360K.

> >Which model Seagate? It is likely to be an aftermarket drive.

> I expect that you're right. But it definitely appears to be
> connected an an IBM controller card. Interesting tidbit; the
> controller has BOTH data cables installed on it even though there's
> only one hard drive. The cables are stacked one on top of the other
> and taped together. I think this is the only time that I've ever seen
> a controller that came with two data cables.

Yeah, IBM always did that (taping the cables together, prefolded to fit
tidily in the case) That tape is prbably pretty thoroughly decayed by

> FINALLY got the drive out! Two screws on the side (inside side, of
> course!) had backed out partially and jammed it up good. The drive is
> a ST 238R (32Mb) so it's definitely not an original drive.

I think that the R means that it is rated for RLL use.
The original stock IBM hard drive controller came set for 10M, but could
be jumpered (solder jumpers or put in a dipswitch) for IIRC, 5M, 10M, 16M,

Minor bad news: on the XT (not AT), there were incompatabilities between
different controllers, so the drive needs to be reformatted to switch to a
different brand of controller!

Grumpy Ol' Fred        cisin_at_xenosoft.com
Received on Mon Apr 07 2003 - 22:52:00 BST

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