Date   : Sat, 18 Aug 2007 09:10:50 +0100
From   : mike@... (Mike Tomlinson)
Subject: Homebrew TUBE ULAs

In article <46C5D3D5.6010702@...>, Jules Richardson <julesrichar
dsonuk@...> writes

>[1] I know Torch did their own thing, but I'm pretty sure their circuitry only 
>looks like a TUBE ULA on the TUBE side of things;

They used two back-to-back VIAs, a 6522 on the Acorn side and an 8255 on
the other side.  I doubt it even looks like a Tube ULA to the Acorn Tube
host software.  As you surmise, trying to use this arrangement as a
drop-in replacement for the 9C ULA is a non-starter.

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