Monitor for ZX81

Frequently Asked Questions about the Sinclair ZX81
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zeteks
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Monitor for ZX81

Post by zeteks » Sun Oct 09, 2011 6:53 pm

What a monitor/TV can I use for my ZX81? My very old TV does not work anymore.

gozzo
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Re: Monitor for ZX81

Post by gozzo » Sun Oct 09, 2011 7:38 pm

The best thing to use with a ZX81 IS an old black-and-white portable(or big one) TV - that's what they were 'designed' to be used with - some ZX81's give a dark picture when used with colour TV's(back porch incorrect) - modern LCD things could be a bit hit or miss unfortunately unless you 'modify' the ZX81 for composite video output(personally I wouldn't do this unless as a last resort)

gozzo
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Re: Monitor for ZX81

Post by gozzo » Sun Oct 09, 2011 7:42 pm

I have a circuit idea for a simple add-on RF to composite converter unit so that no alterations would be needed to the insides of a ZX81 or any other home computer with RF TV output - will post details when (and if!) I get time to test it(if it works!).

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Andy Rea
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Re: Monitor for ZX81

Post by Andy Rea » Sun Oct 09, 2011 8:03 pm

gozzo wrote:I have a circuit idea for a simple add-on RF to composite converter unit so that no alterations would be needed to the insides of a ZX81 or any other home computer with RF TV output - will post details when (and if!) I get time to test it(if it works!).
You will still have the missing back porch, so modern tv's are likely to still struggle.
6 x ZX81, 1 x TS1500 , 1 x +3e, 1 x timex 2040 printer, 1 x timex 2020 cassette deck, siclair printer and some spectrum

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PokeMon
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Re: Monitor for ZX81

Post by PokeMon » Tue Oct 11, 2011 11:41 pm

My plasma TV has no problem with missing back porch.
By the way this is dependend on ZX81 version.
The older ULA's don't have back porch (Issue One e.g.), the newer one's have it (ISS3 e.g.). ;)

RWAP
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Re: Monitor for ZX81

Post by RWAP » Mon Oct 31, 2011 10:45 am

There is of course, now an easy solution to the missing back-porch problem with the early ULAs, which means the ZX81 should then work with any television set.

See viewtopic.php?t=639

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