Thread: Zx81
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Old 16th Mar 2020, 9:01 am   #85
SiriusHardware
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Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 8,240
Default Re: Zx81

In theory yes, but hold that thought until you have tried the composite mod on ZX81(1). If it still has buckled / wobbly video-out even then, then the ULA is one possible cause for the fault.

If doing the composite mod produces good, steady video out from ZX81(1) then it may be that the modulator was actually at fault. No sense changing the ULA without due cause.
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