Date   : Mon, 30 Mar 2009 09:58:12 +0100
From   : philb@... (Phil Blundell)
Subject: A few Econet questions

On Sun, 2009-03-29 at 23:57 +0100, Pete Turnbull wrote:
> If this is what I think it is, it's the collision detect IC, the inputs 
> of which are connected to the data+ and data- lines.  Not fitted on some 
> variants of the board, because after selling lots of modules with the 
> collison detect, some bright spark in Acorn figured out that the 
> software took care of it anyway, and the hardware wasn't needed.

I thought the business with removing and then reinstating the
collision-detect circuitry happened much earlier; my recollection was
that, having been included in the Beeb interface circuit, it was left
out of the first version of the Master plug-in module but then later
added back on for the reasons you mentioned.

It seems a little bit unlikely that Acorn would have had exactly the
same stroke of genius again a few years later with the A3020 modules,
but I guess you never know... :-}

p.