3.5" floppy drive in IBM XT?

From: Tothwolf <tothwolf_at_concentric.net>
Date: Tue Apr 8 21:16:00 2003

On Tue, 8 Apr 2003, Joe wrote:
> At 02:49 PM 4/8/03 -0700, you wrote:
>
> > Near the middle of the board are 8 solder pads. By jumpering those
> > (they are the right size for a 4 position dip switch), you can get the
> > controller to use the other setting that are in its ROM. The 4
> > positions are 2 for each drive, resulting in 4 possible combinations
> > for each drive. 10M, the default, is both switches open.
>
> Thanks for the info but I don't see the pads that you're talking about.
> Near the center of the card are pads for a 14 pin DIP with nothing
> strapped. It's unlabeled but is located between ICs 8D and 10D. Right
> next to the bracket on the very end of the card is a place for an 8 pin
> DIP. It has the package outline painted on the board. But it has two
> rows on header pins installed instead of a DIP package. (The rows are
> .4" apart.) One row of pins is marked S1 and the other is marked 1, 2,
> 3, 4. There's nothing jumpered on it either but I suspect that it's used
> to select the drive sizes.

The 8 pin dip outline near the bracket is what you are looking for. I've
seen WD boards with empty pads, a 4 position dip switch, an empty socket,
and a socket with a punch-type shunt installed. I used to just plug a
standard 4 position dip switch into the header/socket to make selecting
the various drive types much simpler.

-Toth
Received on Tue Apr 08 2003 - 21:16:00 BST