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From: jhma@ukc.ac.uk (J.H.M.Aldridge)
Newsgroups: comp.sys.acorn
Subject: Re: BBC Microcomputer
Message-ID: <7658@harrier.ukc.ac.uk>
Date: 22 May 91 09:11:48 GMT
References: <2784@lee.SEAS.UCLA.EDU> <1991May20.034649.1@vax1.tcd.ie>
Reply-To: jhma@ukc.ac.uk (J.H.M.Aldridge)
Organization: Solid State Logic Ltd., Begbroke, Oxford, UK
Lines: 26

In article <1991May20.034649.1@vax1.tcd.ie> hughesmp@vax1.tcd.ie writes:
.. In article <2784@lee.SEAS.UCLA.EDU>, cccph@jessica.cs.ucla.edu (Charles Hobbs) writes:
.. ..  
.. ..                                     The machine has been modified
.. ..  for 120 VAC, but not for NTSC (some screen lines go off the top of
.. ..  the screen, and I can't get any color, just shades of gray).
.. 
.. The grey (if I remember correctly) is adjustable using a link...
.. (Providing you are using the composite-video socket on the machine?)
.. I don't know which link it is - I've never owned one of the machines,
.. sadly... I think it may be near the video out... Then again, it may
.. only be in my imagination. Someone with a machine might be able to
.. comment? If it is there, moving it gives a colour output as opposed
.. to the standard monochrome...

Some early BBC Micros did not have the link -- you had to solder a capacitor 
somewhere (I can't remember where after 8 years!) in the video section of the
board.

Even if you have the link, it seems very unlikely that you will be able to
display colour on an NTSC monitor as the machine puts out PAL composite
video.  Of course the RGB output should work .....

I can dig out any connection details if required.

--James