Adding a 3rd floppy to an old PC SCSI controller

[Chuck Guzis]

> Date: Tue, 1 Apr 2008 10:47:25 +0200 (CEST)
> From: Christian Corti 

> The 8473 directly supports four drives, so you can do the "trick" a second
> time for a fourth drive. And even some motherboard Super I/O chips have
> support for four drives, the outputs are simply not used.

My needs and the number of spare conductors on the cable 
simultaneously gave out with 3 drives.  Somewhere in my collection 
I've got a controller (may not even be SCSI; could be ESDI or 
MFM/RLL) that had a jumperable option to drive 4 floppies from a 
single cable by using the drive select jumpers and a common motor 
control line.  The two downside issues are that your drives have to 
have 4 drive selects (or you had to be clever with your cable twists) 
and when one motor comes on, they all do.  Better to use two headers 
and two cables, IMOHO.

Cheers,
Chuck