Date   : Wed, 29 Aug 2007 15:17:54 +0100
From   : fragula@... (Fragula)
Subject: Econet oddities

Rob wrote:

>>>Would be interested to see it if you get time to map it out.
>>>      
>>>
>
>A hi-res Picture that i took back in April is at
>http://www.irrelevant.com/bbc/econet%20clock%20inside.JPG
>It's big - 738KB
>  
>
Hmm. While we are on the subject of evil kludges, ISTR at various times
extracting a usuable clock from the user 6522, and either from the
serial ULA or the ACIA.

It worked well enough until the machine got reset for the 6522 or
powered off for the other, and it makes that 555 look positively benign.

Anyone got a schematic for the SJ terminator to post? Thats quite
elegant compared with the Acorn one.

I've run econet over a short link (5-10M or so) of cat 5 without
problems, and at reasonable speed, using a pair for "Drain", a pair for
clock, a pair for data.

Figured it would be much nicer to "fold" the network into a box (with
bypasses on each unused port) and run effectively in a star topology,
while retaining the bus topology timing, over Cat.5 by using a two pairs
for data (send/return) two for clock likeways. Shame I got UTP instead
of STP all them years ago. Still, the cable was free. :-} Thinking the
sheild could be used as drain (which would not be time-sensitive like
the other connections)

Dammit.. Gotta revisit this. There has to be a neat way, I'm missing summit.

Cheers!

M.