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Thread: Zx81 working

  1. #1
    owen2471's Avatar
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    Default Zx81 working

    I'm looking for a good condition working zx81. Just need the computer, nothing else. Needs to have a good picture through rf lead. And needs to stay on when keys are pressed. To many on the other bay are listed has untested.

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    Amibayer! z3spacial's Avatar
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    There is an inherent issue with ZX81s and LCD tvs. If its an issue 1 Zeddy, then its likely to have a ULA that provides no 'back porch' signal, which, translated to English usually means that the display becomes very dark.

    Later versions of the '81 (v3 onwards) had a better ULA which gives a better picture on modern TVs.

    The problem is that someone could quite innocently sell you an '81 as tested with pictures showing it on a CRT - but when you get it, it looks very poor on your LCD - its always going to be a gamble.

    There is another issue too... When the ULA starts to get warm, the signal starts to drift, so you have to keep retuning the tv - old CRTs seem to have some 'aft' setting that logged onto this drift and auto-corrected it. LCDs (or all the ones I've used) sdo no such thing.

    You could go the ZX Vid route - available from RWAP - that replaces the modulator, adds the required backporch signal and gives you composite, or you could buy a ULA2 (but then you haven't got a true ZX81).

    Now, with all this in mind, I can sell you a ZX81, but wont be able to guarantee it will work on *your* tv, but could show you piccys of it on mine. If you are interested, drop me a PM and we can discuss a price or a possible exchange or r3tr0 items
    A1000 & A1200, 48K Speccy and IF1 & Microdrives, Speccy 128 Toaster & divIDE plus, +2(Grey), 2A, +3E, Saturn, Dreamcast, Gamecube, N64 Everdrive, Megadrive / MegaCD & Everdrive, SNES & Everdrive, PCE & EverDrive, Atari Jaguar, C64 & Utimate II, MAME Cabinet,. J'Tag Xbox 360, Original Xbox, Xbox One, PS1,2,3 & 4 , Wii, Wii U, Loadsa PCs.

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    owen2471's Avatar
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    Default Pm

    Pm on the way.

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    Amibayer! z3spacial's Avatar
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    Here's some pics....

    All rubbers underneath are in place. Program typed in as shown...
    Attached Thumbnails Attached Thumbnails IMG_0589.JPG   IMG_0591.jpg   IMG_0592.JPG  
    A1000 & A1200, 48K Speccy and IF1 & Microdrives, Speccy 128 Toaster & divIDE plus, +2(Grey), 2A, +3E, Saturn, Dreamcast, Gamecube, N64 Everdrive, Megadrive / MegaCD & Everdrive, SNES & Everdrive, PCE & EverDrive, Atari Jaguar, C64 & Utimate II, MAME Cabinet,. J'Tag Xbox 360, Original Xbox, Xbox One, PS1,2,3 & 4 , Wii, Wii U, Loadsa PCs.

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    Amibayer! z3spacial's Avatar
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    Payment of 25 + 5 p&p received for ZX81 This will be despatched tomorrow by recorded delivery. THANKS
    A1000 & A1200, 48K Speccy and IF1 & Microdrives, Speccy 128 Toaster & divIDE plus, +2(Grey), 2A, +3E, Saturn, Dreamcast, Gamecube, N64 Everdrive, Megadrive / MegaCD & Everdrive, SNES & Everdrive, PCE & EverDrive, Atari Jaguar, C64 & Utimate II, MAME Cabinet,. J'Tag Xbox 360, Original Xbox, Xbox One, PS1,2,3 & 4 , Wii, Wii U, Loadsa PCs.

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    Default Thanks

    Hello
    Many thanks. A smooth transaction.

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