Thread: Zx81
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Old 10th Mar 2020, 3:06 pm   #8
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Join Date: Oct 2003
Location: Croydon, Surrey, UK.
Posts: 6,808
Default Re: Zx81

I seem to recall that the sync output of the ZX81 was less than perfect (as already suggested by SiriusHardware in post 2). Some TV's were sensitive to this and I had to try several before I found one that worked. Some early TV's had a 'VCR' position and this also helped as the sync time-constant is increased when the VCR position was selected.
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