Re: PC20-III IDE interface

From: Ethan Dicks (
Date: 2003-11-21 16:41:47

> Hello,
> On Fri, Nov 21, 2003 at 04:18:24PM +0100, Spiro Trikaliotis wrote:
> I totally forgot: Obviously, this is not an IDE interface, but a
> kind of MFM controller.

Well... the AT-IDE controller is a bundled WD-1003, so from that
standpoint, *all* PC IDE controllers are a kind of MFM controller.

> IDE is much newer and wasn't known at times of XT [1]

Sure it was... just very late.
> [1] This is not totally true. Some might remeber the days where IDE
> was     called "AT-bus". In fact, there was even an "XT-bus" 
> specification, but I don't know any real hardware for that one.

How about the Commodore Colt?  I have one (dead at the moment, due
to a leaking clock battery).  How about the Amiga A590?  A2091?
The 40-pin connector on the A590 and A2091 is for an XT-IDE drive.
ISTR one such drive was the WD 93028X (could be slightly off; it's
from memory).

I even have a WD 20MB Hard Card (in a Compaq Luggable) with an XT
IDE drive and controller.

I don't think there were ever any drives larger than 40MB in XT IDE

They existed, but they were only around for a small amount of time.
Commodore used them in the Amiga because they had crates and crates
of them, leftover from their PC-XT days.


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