TV having trouble tuning into ZX81 signal with no back porch @Scalibq
TV having trouble tuning into ZX81 signal with no back porch @Scalibq
Uploaded June 2013 | Updated September 2026, 2 weeks ago
This is what happens when the back porch pulse is missing from your vintage ZX80/81 video circuitry, on a modern TV.
Older TVs or VCRs tend to be far more forgiving, and will have no problem with the ZX80/81 signal.
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TV having trouble tuning into ZX81 signal with no back porch

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