Newsgroups: comp.sys.transputer
From: jdd@aiki.demon.co.uk (Jim Dixon)
Subject: Re: Building A TRAM
Organization: AIKI Parallel Systems Ltd
Date: Fri, 26 Aug 1994 17:57:23 +0000
Message-ID: <777923843snz@aiki.demon.co.uk>

In article <33hsl1$lqb@wimbledon.dcs.hull.ac.uk>
           d.r.smith@e-eng.uk.ac.hull "Dave Smith" writes:

> What we have is a T225, with link 1 wired as in the Transputer Technical
> Notes, BootFromROM low, and the rest of the pins as they should be according
> to the data (as far as we know).

The first thing to do is to check that the transputer clock is running, and
that it is running at the expected speed.  If it isn't, there is something
very basic wrong.  One common problem is that the 1uF ceramic cap isn't
to the right tolerance.  It must be 10% or better.  20% caps often do not
work.

Then check with a scope to make sure that the link speeds are set correctly.

Then make sure that the LinkIns that you are not using are pulled down.  If
they are not, the transputer will boot off the noise on an inactive link.

> When we run a worm, either the B008 one or the TDS2 one, the T225 receives 
> a packet on Link1In and sends an acknowledge, but that's it, finished. The
> worm doesn't recognise it and nowt else happens.

Another common problem is that people used ordinary wires to connect the
links.	If you are running wires through the air, they must be twisted
pair.

> If anyone out there in transputer land has any advice (or circuit diagrams)
> then you would be saving two poor men a lot of heartache.

If you get this fair, send me a postal address and I will send you a
circuit diagram.
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