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Vintage Computers Any vintage computer systems, calculators, video games etc., but with an emphasis on 1980s and earlier equipment. |
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14th Sep 2011, 6:57 pm | #21 | |
Dekatron
Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 11,553
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Re: ZX81 on modern TV
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15th Sep 2011, 6:48 am | #22 | ||
Retired Dormant Member
Join Date: Mar 2011
Location: Derby, Derbyshire, UK.
Posts: 48
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Re: ZX81 on modern TV
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If that doesn't work, I'll get out my old VC-20 or my C64-C and try both of those, both of which I know work okay. |
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17th Sep 2011, 2:52 pm | #23 |
Hexode
Join Date: Aug 2011
Location: Luton, Bedfordshire, UK.
Posts: 469
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Re: ZX81 on modern TV
My ZX81's are both early models...indeed one is so early the ULA simply says "8112" on it - meaning 12th week of 1981. It is soldered onto the motherboard and not in a chip socket, no other identifying marks. Given that the ZX81 was launched in February 1981 and mine was manufactured in late March 1981 it is a *very* early example. It even has the klutzed ROM giving the wrong square root for 0.5
So any problems, it's going to have them. I have modded it to give a composite video output but of course it's still missing important signals. |
25th Nov 2011, 6:53 pm | #24 | |
Retired Dormant Member
Join Date: Nov 2011
Location: Bristol, UK.
Posts: 168
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Re: ZX81 on modern TV
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Lloyd Last edited by DragonForce; 25th Nov 2011 at 6:58 pm. Reason: spelling error |
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28th Nov 2011, 1:05 am | #25 |
Rest in Peace
Join Date: Apr 2008
Location: London, UK.
Posts: 2,508
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Re: ZX81 on modern TV
Perhaps you can get it ready-made for composite signals in the form of those 'video signal conditioner' or 'copy enhancer' devices that used to be marketed as a useful tweak box to correct video deficiencies when dubbing. Their real purpose of course was to strip Macrovision protection from playback of pre-recorded material, which might well have been done by a similar system using an LM1881 and timers to replace the mutilated lines and eliminate the varying back porch level.
Lucien |
28th Nov 2011, 1:20 am | #26 | |
Nonode
Join Date: Oct 2008
Location: Warsaw, Poland and Cambridge, UK
Posts: 2,677
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Re: ZX81 on modern TV
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Chris |
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28th Nov 2011, 4:01 pm | #27 |
Retired Dormant Member
Join Date: Nov 2011
Location: Bristol, UK.
Posts: 168
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Re: ZX81 on modern TV
Agreed - apologies.
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