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Old 25th Nov 2017, 12:45 pm   #28
SiriusHardware
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Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
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Default Re: Nascom repair - Looking for clues please

Quote:
Originally Posted by cmjones01 View Post
White LEDs typically use a Gallium Nitride visible blue LED, around 460nm wavelength, with a phosphor coating to create white or other colours like pink.
Ah, in that case maybe I was thinking of flourescent lights (produce UV, which is converted to visible light via the phosphor coating?)

Acollins22, it might be worth going back to the vintage computer forums to this thread which you were involved in early on:

http://www.vcfed.org/forum/showthread.php?60295-Nascom

It has since developed into a fairly technical discussion about various aspects of the Nascom (1) and is still ongoing. You might find some useful clues there now.

One thing which comes up over and over again in discussions I've read about the Nascoms (1) and (2) is their apparent sheer fussiness about individual ICs - in some cases replacing one apparently working IC with another working IC, or swapping two of the same ICs over in the machine, will cause a significant change. This is especially the case when it comes to the video circuits.
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