Date   : Wed, 13 Mar 2002 10:55:49 +0000 (GMT)
From   : Sprow <rsprowso@...>
Subject: Re: WD 1770

On Sat, 9 Mar 2002, Dr. David Alan Gilbert wrote:

> * Philip Peake (philipp@...) wrote:
> > The A3000 & Master Compact both have 1772s in them, not 1770s. The only
> > substantial difference is the step rate, which in the 1772 is optimised for
> > 3.5" drives, so you might have some problems if you try to connect a 5.25"
> > drive through a 1772
> 
> Well in particular the step timing is different.  I'm not aware of any
> other differences (I think the Master had either 1770 or 1772 depending
> on random events...).  For example a 1772 won't even budge our old full
> height 5.25" drives; it should be OK with a relatively modern 5.25" drive.

Later issues of (A)DFS had extra 'step' options which included a software
delay to adjust for the 1772's rather shorter step times.
Sprow.