Date   : Mon, 04 Nov 2002 23:33:59 +0000
From   : Philip Blundell <pb@...>
Subject: Re: Econet circuitry

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.

> 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.