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SiriusHardware · 16th Mar 2020, 10:01 am

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.

16th Mar 2020, 10:01 am	#85
SiriusHardware Dekatron Join Date: Aug 2011 Location: Newcastle, Tyne and Wear, UK. Posts: 11,553	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.