Date   : Thu, 26 Jan 2006 00:46:01 +0000
From   : jgh@... (Jonathan Graham Harston)
Subject: Border colour on BBCs

A suggestion to emulator writers. How about implementing border
colour?
 
In 1991 I built a bit of hardware to provide a border colour for
the Beeb. It's a 4-bit latch and 4-bit two-input switch on a small
board that piggy-backs over the video ULA. Writing to &FE22 sets
the border colour as an RGB value.
 
There's pictures and a circuit diagram on my site at
http://mdfs.net/Info/Comp/BBC/Border
 
-- 
J.G.Harston - jgh@...                - mdfs.net/User/JGH
BBC BASIC for the Sinclair Spectrum - http://mdfs.net/Software/Spectrum