Date   : Fri, 08 Nov 2002 07:56:09 +0000
From   : Mike Tomlinson <mike@...>
Subject: Re: Econet circuitry

In article <c0fec3914b.Wookie@...>, Wookie
<WookieMan@...> writes

>Would a MC68B54P from an archimedes be any good ?

Yes, it's the same chip, made by Motorola.

>SP9136  DS3691N  AM26LS30PC
         ^^^^^^^  ^^^^^^^^^^
This chip is pin compatible with, and interchangeable with the 75159
line driver chip used in the Beeb.  (The first number is the date code -
week 35 of 1991.)

Phil's comments about unsoldering chips being a miserable business are
quite correct.  It would be interesting to see how neat a job could be
made of modifying a Master/Archimedes module to work in a Beeb.

By the way, there are two versions of the Master/Archimedes Econet
module.  The first has 4 chips and relies on software for collision
detection.  The improved version has 6 chips and does collision
detection in hardware.

-- 
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