Thread: Zx81
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Old 23rd Mar 2020, 11:02 am   #144
SiriusHardware
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Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 8,519
Default Re: Zx81

My hypothesis is that the ULA is not faulty but it is objecting to the composite mod for some reason. Remove the composite mod, see if the ULA still behaves the same way. If you think about it, although you had problems before you fitted the composite mod, you didn't have that particular problem.
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