4 floppy disk drives on a PC?

From: Vintage Computer Festival <vcf_at_siconic.com>
Date: Sun Jan 16 13:23:55 2005

On Sun, 16 Jan 2005, Scott Stevens wrote:

> The original IBM-PC's floppy controller made provisions for four floppy
> drives. There are control lines to select up to four drives on the
> single interface. They put a 37-pin D-shape connector on the bracket of
> early IBM floppy controller cards so you could plug in an expansion case
> with two external floppy drives.
> I only did this once, as an experiment, to see if I could run my old
> WWIV BBS on floppy-drives only, to reduce the noise of the machine. (It
> worked, but was much slower.)
> I'm pretty sure the 'fix' isn't to plug in an old IBM controller,
> though, unless you're already talking about a vintage restoration
> project. But the third and fourth select lines should be available on
> some controllers.

I'd like to make a box with four floppy types: 5.25" 360 and 1.2, and
3.5" 720 and 1.44. I seem to recall someone here did this.

I imagine I can use the integrated floppy controller and then add another
board to provide the additional controller.

I'll check the DOS manual to see if it says anything as Nico indicates.

Sellam Ismail                                        Vintage Computer Festival
International Man of Intrigue and Danger                http://www.vintage.org
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Received on Sun Jan 16 2005 - 13:23:55 GMT

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