ESDI (was: free DEC M7555 card

From: Fred Cisin <cisin_at_xenosoft.com>
Date: Mon May 6 11:53:42 2002

On Mon, 6 May 2002, Allison wrote:
> The problem with EDSI was it sued the same cables as MFM IE: the pair
> of 26 pin and 34pin. The interfaces however were toally incompatable.

Allison is, of course, absolutely correct.
ST506/412, what is often sloppily called "MFM" provides a set of signals
for drives that can support either an MFM or RLL encoding. (Well, it
COULD support other encodings as well) MFM and RLL drives could be
interchanged with each other, although many MFM drives could not reliably
do RLL. That did not stop many people from using them anyway, and then
cursing the manufacturer when they wouldn't perform past spec.

ESDI was SIMILAR, but NOT compatible with ST506/412


> The problem with EDSI was it sued the same cables as MFM IE: the pair
                               ^^^^
We live in a litigious society.

> of 26 pin and 34pin. The interfaces however were toally incompatable.
     ^^
Odd. Mine seem to have 20
Received on Mon May 06 2002 - 11:53:42 BST