Date   : Thu, 07 Nov 2002 19:01:22 +0100
From   : Wookie <WookieMan@...>
Subject: Re: Econet circuitry

In message <1036452839.28035.18.camel@...>
          Philip Blundell <pb@...> wrote:

> On Mon, 2002-11-04 at 20:25, Chris Johns wrote:
> > The ADLC, 319s and 75159s may be hard to get hold of.
> 
> I think both the 319 and the 75159 are still in production, so there
> shouldn't be any undue problems obtaining those devices.  But the 68B54
> could be more of a challenge.

Would a MC68B54P from an archimedes be any good ? I have a couple of
those econet cards plus network clock box + leads + terminators etc I
don't use anymore.

The cards have the following chips...
(1 chip per line all markings on chips shown below)

SP9136  DS3691N  AM26LS30PC
M9136  LM319N
MB9136  DM74LS132N
MP9136  DM74LS123N
MC68B54P  N6R  LLAS9114
M9136  LM319N

Please note that all these chips are soldered to a pcb and would require
unsoldering first!

> > I did have an idea of how to hack one of the Master modules into a beeb,
> > but I never tried it out, it basicially involved making the necessary
> > signals to talk to the master module by using bits of the full BBC
> > econet circuit and then letting the module do the rest. I'll dig the
> > books out if you want more info.
> > 
> > Anyone any thoughts as to if this would or wouldn't work?
> 
> No real show-stopping issues come to mind.  The module would more or
> less drop in where the 68B54 is connected.  You would need to populate
> at least the bits of the BBC that handled INTON/STATID, maybe some
> address decoding, that kind of thing.  Beyond that, it ought to be
> relatively plain sailing I expect.
> 
> p.
> 


Cheers Wookie.

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