Econet was
available on just about all the Acorn computers -- 'Systems'=
,
Atom, BBC micro, Electron (? the Advanced User
Guide for the Electron
mentions it), ACW, Archimedes. I wouldn't be suprised if it wasn't
available on the RiscPC too. Presumably it was used, or Acorn wouldn't
have persisted with it.
It was an optional extra on the Archimedes range - the case cutouts
were there but you needs a small additional circuit board that plugged
onto the motherboard and carried the controller logic and ports.
It was optional (rather than standard) on almost all Acorn machines. The
only one I know to have had it as standard was the ACW.
For the 'System' machines, the Econet interface was not suprisingly an
Eurocard you put in a spare slot of the cardcage.
For the Atom, there was a long, thin PCB that plugged onto the solder
side (top) of the main PCB. I can't rememebr if the header plug for this
to fit onto was standard on all Atoms, or whehter you soldered it in when
adding the Econet upgrate. Since the Atom expansin bus was the same as
the System bus, you could also use the System Eurocard with the Atom (and
I hace an Atom where this has been done)
Beebs (and B+'s?) had the main PCB laid out fo the econet circuitry, but
no compoennts were fitted. The upgrade was a 'bag of bits' that you
soldered to the main PCB. Some early 'issues' of the BBC mainboard could
take the Econet clock generator circuit too.
The Master and Archimedes machines took a little plug-in PCB containing
econet circuit. There were at least 2 versions of this one had hardware
collision detection, the other didn't. The same module is used, IIRC, in
the Filkestore systems.
-tony
