Parallel port hard drives?

From: John Wilson <wilson_at_dbit.dbit.com>
Date: Tue Mar 28 17:39:48 2000

On Tue, Mar 28, 2000 at 07:51:51PM +0100, Tony Duell wrote:
> Actually, whether it changes the drive speed is often a
> jumper-configurable option as well. And most PC drives are jumpered so
> that the drive speed is NOT changed -- PC 1.2Mbyte drives run at 360rpm
> even when used with DD disks (but the controller data rate is increased
> from 250kbps to 300kbps to compensate).

The nice thing about this feature is that once the jumpers are set, it's
the FDC+FDD's business and software doesn't have to know which way it's
set up. Writing 01h to 3F7h sets the drive for either 250kHz/300 RPM
or 300kHz/360RPM, whichever is appropriate for this FDC+FDD combination.
Either way you can access 360 KB disks, kinda, and RX50 disks, definitely.

John Wilson
D Bit
Received on Tue Mar 28 2000 - 17:39:48 BST