Date   : Tue, 03 Aug 1999 11:03:00 +0100
From   : Mike Tomlinson <mike@...>
Subject: Re: Econet hardware

In article <0182399E7179D211824400A0C9EA408AB2B91A@...>,
Jon Bloomfield <Jon.Bloomfield@...> writes

>       IC93  - 75159
>       IC97  - 74LS74
>
>Of course I'm assuming these chips are socketed like the disk interface,
>otherwise it's a lot of effort to get them out.

The 75159 (the line driver) should be socketed on all model Bs.  It's a
very common failure point on Econets, causing the line to jam.

We used to get ours from the RS catalogue - do they not stock them any
more?

I seem to remember Acorn made the mistake of soldering the 75159 on
early B+'s, necessitating removal of the main board and desoldering when
it failed.

-- 
Mike Tomlinson