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<1…15161718192021…34>
  • So for my first trick...I'm sure people have already used the AD724 or AD725 on other 8 bit machines, and i know the Harlequin uses the 724, but not seen anyone trying to us…

    ... ,G,B and composite sync signal are present also without the ... some cable use the composite video signal at pin 1 of the ...
    ingo ingo May 2016 Hardware
  • So for my first trick...I'm sure people have already used the AD724 or AD725 on other 8 bit machines, and i know the Harlequin uses the 724, but not seen anyone trying to us…

    ... to generate a colour composite video signal. This signal is then fed to ... go short circuit), the RGB video output will continue to work ... SCART leads use the composite video signal (instead of the sync output ...
    1024MAK 1024MAK May 2016 Hardware
  • Small batch of ZX-Unos outside SpainI am a member of the ZX-Uno team. We have launched a sucessfully crowdfunding campaign of 250 ZX-Uno, but they are all sold (mostly in Spain). I apol…

    ... video. PAL is a method of encoding an additional colour signal ... monochrome composite video signal. The monochrome composite video signal includes the ... the existing monochrome composite video signal in such a way ... there was only one video standard, there is no ...
    1024MAK 1024MAK June 2016 Sales
  • ZX-Uno moddingStarting with ZX-Uno case modding I have not yet received my ZX-Uno yet (it is in the post) but I know that I will have to do at least one mod …

    ... 48k / + computers is a UHF video signal designed to feed into a ... as baseband video) is a combined video level signal (brightness and ... "Composite Video" does not tell you which video signal standard is ... converts the Composite Video to a UHF signal by mixing ...
    1024MAK 1024MAK June 2016 Hardware
  • ZX-Uno moddingStarting with ZX-Uno case modding I have not yet received my ZX-Uno yet (it is in the post) but I know that I will have to do at least one mod …

    ... connect the appropriate video signal if the devices ... video signals are transmitted, the Red video, the Green video and the Blue video ... (or "composite") synchronisation signal and ground. SCART also ... problems
    Composite Video colour - acceptable, but ...
    1024MAK 1024MAK June 2016 Hardware
  • A focus on old TVs for 48k spectrums The old 48k Spectrum is becoming harder to use "display wise" in its original state. This thread is about retaining originality and not going down …

    As the video signal frequency differs a factor 30 ...
    roko roko July 2016 Hardware
  • 128k toastrack board changesI was working on my spectrums this weekend and opened up my toast rack to look at the possibility of changing out the Electrolytic caps. I was awar…

    ... the sound carrier to the video signal at pin 8 of TEA2000 ...
    ingo ingo September 2016 Hardware
  • 128k toastrack board changesI was working on my spectrums this weekend and opened up my toast rack to look at the possibility of changing out the Electrolytic caps. I was awar…

    ... the format of the composite video signal. From what you say, I ...
    1024MAK 1024MAK September 2016 Hardware
  • Brightness level of non-bright attributes on classic ZX 48Does anybody know what was a brightness level of non-bright attributes on classic ZX 48? Was it the same on 128, +2 and +3? I can see on wikipedia a…

    ... are talking about an analogue video signal, where "looks about right" ...
    I could measure the video signal voltage for you. But this ... the luminance part of the signal (black/grey/white level), ... to analyse the colour encoded signal.
    And none of ...
    1024MAK 1024MAK September 2016 Hardware
  • Brightness level of non-bright attributes on classic ZX 48Does anybody know what was a brightness level of non-bright attributes on classic ZX 48? Was it the same on 128, +2 and +3? I can see on wikipedia a…

    ... I'm absolutely zero in video signals encoding, so I ... encoding system for analogue composite video. Developed so that colour ... existing black and white composite video signal.
    RGB is three ... , VGA) as three monochrome video signals, but instead of black ...
    1024MAK 1024MAK September 2016 Hardware
  • Brightness level of non-bright attributes on classic ZX 48Does anybody know what was a brightness level of non-bright attributes on classic ZX 48? Was it the same on 128, +2 and +3? I can see on wikipedia a…

    ... capture a image of the video waveforms (using my oscilloscope) of ... issue 1 board's composite video signal, and the ULA's YVU ...
    1024MAK 1024MAK September 2016 Hardware
  • Brightness level of non-bright attributes on classic ZX 48Does anybody know what was a brightness level of non-bright attributes on classic ZX 48? Was it the same on 128, +2 and +3? I can see on wikipedia a…

    ... generates a gamma corrected composite video signal from a six bit RGB ... the TEA2000 for each colour signal are 0, 2, and 3 ...
    guesser guesser September 2016 Hardware
  • Composite video ghost image on ZX Spectrum 128K +2Hi, I have a ghost image on the composite video out on my ZX Spectrum 128K +2 and have run out of ideas of what could be wrong. Does anybody have a…

    ... can use either composite video (where all the video information is carried ... the RGB and the composite video at the same time (it ... longer to decode a composite video signal, hence why it's offset ...
    1024MAK 1024MAK September 2016 Hardware
  • What to buy +2, +2A, +2B, +3??Hi all I've always wanted to buy a 128k Spectrum and I've seen some lately in eBay going for cheap. The 128K+ is expensive I understand because of…

    ... of which makes the composite video output poor quality.

    video signal caused by the sound being ... which also affects the composite video signal for no good reason.
    1024MAK 1024MAK October 2016 Hardware
  • No sound from ToastrackHi everyone, not posted in here in a while! Anyway I have a really nice "toastrack" I am working on at the moment which just needs a new keyboard …

    ... and interferes with the composite video signal for no good reason. Or ...
    1024MAK 1024MAK October 2016 Hardware
  • No sound from ToastrackHi everyone, not posted in here in a while! Anyway I have a really nice "toastrack" I am working on at the moment which just needs a new keyboard …

    ... and interferes with the composite video signal for no good reason. Or ...
    britain4 britain4 October 2016 Hardware
  • ZX Speccy +2A - B&W & snowy RF output + other issuesHi All, I am new to this forum and I am back to the Spectrum world after 25 years. Recently I've bought a second hand +2A (+2B board - Z70833 Issu…

    ... of the composite colour video signal and the limitations of ... Spectrum generates the composite colour video signal. So it's normal ... generated from the composite colour video signal. Plus the modulator (in ... actually due to the signal processing in modern flat ...
    1024MAK 1024MAK October 2016 Hardware
  • Meddling with the RGB signal - any experts out there?A few questions, if anyone knows - is it OK to split the A/V signal and feed it to two TVs? I'm assuming that it's not OK to do this with the RGB …

    ... want to split the composite video; I know the RGB cable ... it as the vertical sync signal (I seem to remember) of ... socket. Now I know the video signal is a more complex waveform ... the modulator will boost the signal there?
    joefish joefish October 2016 Hardware
  • Meddling with the RGB signal - any experts out there?A few questions, if anyone knows - is it OK to split the A/V signal and feed it to two TVs? I'm assuming that it's not OK to do this with the RGB …

    ... the same affect (reduced signal voltage, for that colour ... Now I know the video signal is a more complex ... br />
    A composite video signal will be significantly affected by ... boost the signal there?[/quote]The composite video signal is converted ...
    1024MAK 1024MAK October 2016 Hardware
  • Meddling with the RGB signal - any experts out there?A few questions, if anyone knows - is it OK to split the A/V signal and feed it to two TVs? I'm assuming that it's not OK to do this with the RGB …

    ... tap off a second composite video signal, but if there isn't ... 't work. Is a composite video signal available anywhere on this machine ... +2, that has a composite video signal. So perhaps the RGB Scart ...
    joefish joefish October 2016 Hardware
  • Meddling with the RGB signal - any experts out there?A few questions, if anyone knows - is it OK to split the A/V signal and feed it to two TVs? I'm assuming that it's not OK to do this with the RGB …

    Note that some SCART leads use the composite video signal for the composite sync (as the composite video signal includes the composite sync signal).

    Is it doing your head in yet :P

    [b][i]Mark[/i][/b]
    1024MAK 1024MAK October 2016 Hardware
  • Meddling with the RGB signal - any experts out there?A few questions, if anyone knows - is it OK to split the A/V signal and feed it to two TVs? I'm assuming that it's not OK to do this with the RGB …

    ... SCART leads use the composite video signal for the composite sync (as ... the composite video signal includes the composite sync signal).

    ... it goes to the composite video input on the SCART ... didn't just put composite video on the DIN plug ...
    guesser guesser October 2016 Hardware
  • Meddling with the RGB signal - any experts out there?A few questions, if anyone knows - is it OK to split the A/V signal and feed it to two TVs? I'm assuming that it's not OK to do this with the RGB …

    ... just feed in the Composite Video signal anyway.

    I know ... to. That uses the Composite Video as Composite Sync too.
    Video fed into one of the ... a +2, then the composite video could go to another TV ...
    joefish joefish October 2016 Hardware
  • Meddling with the RGB signal - any experts out there?A few questions, if anyone knows - is it OK to split the A/V signal and feed it to two TVs? I'm assuming that it's not OK to do this with the RGB …

    ... just feed in the Composite Video signal anyway.[/quote]

    As ... to be a regular composite video signal going in, and the ability ... just feed in a sync signal has been tacked on later ... generate text overlays for a video player or satellite receiver etc ...
    guesser guesser October 2016 Hardware
  • Shimmering displayHi all, I've got a 48K issue 4S and it appears to be working apart from it's displaying weird vertical shimmering patterns. It passes a RAM test t…

    The signal looks a bit saturated in your video.
    This might be ... caused by the signal amplitude ... . If you use the composite signal from the modulator input, try ... the DC offset at the video signal and is finally a better ...
    ingo ingo November 2016 Hardware
  • Original Grey +2 Picture IssuesSo, I have my +2 connected to an old CRT TV, and the Speccy has been working fine. Decided to have a shift around, but once I moved the +2 i've lost…

    ... you get a weak monochrome video signal on the RF/UHF TV ...
    1024MAK 1024MAK January 2017 Hardware
  • I've Killed my BBC Micro :(So, today I pluged in my BBC Micro via my step up converter. It did the customary double beep. I was buzy tuning in the LCD tv to it, as I'd lost the…

    ... operation and then replaced the Video out BNC for an RCA ... fine with a monochrome composite video signal, but not so good once ... the colour carrier signal is mixed in (it's ...
    1024MAK 1024MAK January 2017 Chit chat
  • I've Killed my BBC Micro :(So, today I pluged in my BBC Micro via my step up converter. It did the customary double beep. I was buzy tuning in the LCD tv to it, as I'd lost the…

    ... operation and then replaced the Video out BNC for an RCA ... fine with a monochrome composite video signal, but not so good once ... the colour carrier signal is mixed in (it's ...
    Scottie_uk Scottie_uk January 2017 Chit chat
  • I've Killed my BBC Micro :(So, today I pluged in my BBC Micro via my step up converter. It did the customary double beep. I was buzy tuning in the LCD tv to it, as I'd lost the…

    ... operation and then replaced the Video out BNC for an RCA ... fine with a monochrome composite video signal, but not so good once ... the colour carrier signal is mixed in (it's ...
    1024MAK 1024MAK January 2017 Chit chat
  • Looking for advice on building a HarlequinNew member here. From the US. My first computer was a Timex Sinclair 1000 back in the early 80s (in fact, I got one of the first batches sold in th…

    ... problem is the way the video signal is generated in the first ...
    RobeeeJay RobeeeJay February 2017 Hardware
<1…15161718192021…34>

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