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<1…19202122232425…34>
  • 3.4 Inch TFT with 48k Spectrum....hmmm?Hey guys, So I have been playing around with the idea of using a small LCD with composite input for a 48k Speccy. I got hold of one of these relat…

    ... )
    Horizontal (line) sync
    Vertical (field) sync
    Chrominance (colour) ... to 100uF) allows the composite video signal through.

    ... a bodge really. In most video amplifier designs, you want ... get one of the two video modules from Sell My ...
    1024MAK 1024MAK February 2015 Hardware
  • Scart issues with a 2AAnyone else have problems with scart leads with Spectrum 2A's?. I tested mine with three Samsung TV's ( all around 2/3 year old) , and it gave me a …

    ... +2. The problem is that sync signal is very noisy which ... /limited-batch-of-new-s-video-adapters/msg94123/#new"]http://www ... /limited-batch-of-new-s-video-adapters/msg94123/#new[/URL]
    chinnyhill10 chinnyhill10 February 2015 Hardware
  • Speccy tape on IOS iPhone and lcd monitor questionHi ive just bought a 48k spectrum to relive a bit of my programming youth . I noticed there's a Speccy tape app that should link to games on this …

    ... "VGA" monitors, they use different sync and scan rates (frequencies) and ... Spectrum to produce a composite video output, and buy a standards ... you need is a composite video to VGA converter. Try eBay ... CRT) that has a composite video input instead. Then you just ...
    1024MAK 1024MAK July 2015 Sinclair Miscellaneous
  • TV Pal, odd and even framesI have been researching, but haven't found any real interesting information on this subject, so far. What I mean is, since TV PAL signal is interl…

    ... the hack do PAL televisions sync to that ?[/quote]

    sync pulse. Once you start sending video lines the ... field with just an extended sync pulse to signal the start ... a TV that refuses to sync to that so clearly it ...
    guesser guesser August 2015 Development
  • TV Pal, odd and even framesI have been researching, but haven't found any real interesting information on this subject, so far. What I mean is, since TV PAL signal is interl…

    ... struggle, because the Speccy's sync pulse is a bit odd ... it comes to the actual video timings.
    It's entirely ... refuse to sync. Certainly I have a horrible cheap USB video capture ... thing off ebay that won't sync to ...
    guesser guesser August 2015 Development
  • I feel they could have done this.After reading the ZX Spectrum ULA, I learned about how the ULA detects if the Z80 if going to access memory in the next cycle and stops it if the ULA…

    ... display.
    Third, if the video RAM was write only, how ... the "shadow screen" to the video RAM, it may take too ... time before the next vertical sync. Any write delay would therefore ...
    1024MAK 1024MAK August 2015 Hardware
  • Newbie Hardware QuestionsI just recently aquired my first Spectrum, a +2, and I'm in the process of getting acquainted with it. Being a newbie I had some questions, which …

    ... or the composite video to the GBS's sync input

    sync, particularly with what's coming ... is to use a simple sync stripper chip to remove the ...
    Questarian Questarian August 2015 Hardware
  • I recapped my 128K toastrack, installed stereo kit and detached audio from video, but...Hello fellow forumers! I'm seeking for help: I've finally decided to change all electrolytic capacitors of my 6U (with all Panasonics 105oC)... Af…

    ... check for 12v (to the video circuity)? In what pin of ... concerned, do you mean the SYNC output from the ULA (pin ...
    geosiou geosiou October 2015 Hardware
  • Was there a POKE that broke the SpectrumHi Everyone I've been recalling myths and rumours from back in the day. You know "Lunar Jetmans" trailer and that sort of thing. But one rumour …

    ... not produce a valid TV (video) signal. All TVs are ... someone unplugs/disconnects any other video source while the TV is ... televisions, the horizontal and vertical sync systems will continue to produce ... critical controlled by the input video signal, so a loss ...
    1024MAK 1024MAK October 2015 Sinclair Miscellaneous
  • Video Problem - Spectrum 48kYet again I come seeking help.... Can anyone point me in the direction of anything that explains the video generation circuit on the Spectrum? I'v…

    ... colour encoder.

    The sync is in the Y output ... other side to a composite video input on your TV / monitor ...
    1024MAK 1024MAK November 2015 Hardware
  • PUSH scrollers 3[url=https://drive.google.com/file/d/0B-KEeni1WXmoYk9Dek1zVnd6Rk0/view?usp=sharing]CATS - Faith edition (example)[/url] Hello and welcome to the w…

    ... program to synchronize with the video beam...


    [code ... .l $dff004,d0 ; Test the video beam for vertical position 303 ... #$1ff00,d0 ; to sync the code to the video refresh rate
    Mysterion Mysterion November 2015 Development
  • Best composite mod informationJust got my 16K (Issue 3) working. I'm in NTSC land so I need to run a composite signal through my PAL<->NTSC converter. I know there are a ton o…

    ... displays is just black video from the composite sync output. My assumption ... being switched getting into the video input pin.
    guesser guesser November 2015 Hardware
  • Why is RGB the best?Sorry, I know my question may sound odd but I have been doing some reading lately and this has struck me. This is what we know: RF -> CVBS -> …

    ... or luminance) and synchronization (sync) information. Y = 0.2126 ...
    The S-video cable carries video using two synchronized signal ... green, blue) analog component video standards (e.g., RGBS, ... of carrying non-interlaced video and/or resolutions higher ...
    rtunes rtunes December 2015 Hardware
  • Spectrum +2 with CM8833 MK-II monitor (RGB)Hello all, This weekend I decided to resurrect my old 128K Spectrum +2 (grey model). I plugged it into an LCD TV via RF, but the picture is rathe…

    ... to see what the COMP SYNC and video signals looked like. I ... hooked up my 'scope to COMP SYNC ... , it looks like the COMP SYNC line is very glitchy? Surely ...
    BJH BJH January 2016 Hardware
  • Spectrum +2 with CM8833 MK-II monitor (RGB)Hello all, This weekend I decided to resurrect my old 128K Spectrum +2 (grey model). I plugged it into an LCD TV via RF, but the picture is rathe…

    I just checked the vertical sync too, and although it is ... HSYNC noise.

    The video output on this looks very ...
    BJH BJH January 2016 Hardware
  • Spectrum +2 with CM8833 MK-II monitor (RGB)Hello all, This weekend I decided to resurrect my old 128K Spectrum +2 (grey model). I plugged it into an LCD TV via RF, but the picture is rathe…

    ... to see what the COMP SYNC and video signals looked like. I ... hooked up my 'scope to COMP SYNC ... in mind that the COMP SYNC is a composite / combined ... horizontal and vertical sync signal. So unless you set ...
    1024MAK 1024MAK January 2016 Hardware
  • 128 +2 grey, no video but still beepsGot a grey 128 from ebay, im using a 48k spectrum powers supply, all voltages seem ok. I cant get compostie video using the normal mod or from the 8…

    ... display the composite sync signal as the composite video signal (which it ... effectively is - just a video of a black screen)
    guesser guesser February 2016 Hardware
  • 128 +2 grey, no video but still beepsGot a grey 128 from ebay, im using a 48k spectrum powers supply, all voltages seem ok. I cant get compostie video using the normal mod or from the 8…

    ... :
    LK1 ... open (no V-sync at pin 5)
    LK2 ... present)
    LK4 ... closed (composite video at pin 1)
    LK7 ...
    ingo ingo February 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…

    ... the displays I had would sync to the composite output at ... , switchmode regulators, the AD725 for video output, and so on.
    Peter Mulholland Peter Mulholland 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…

    ... . R,G,B and composite sync signal are present also without ... composite video signal at pin 1 of the Spectrums connector for sync ...
    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 ... go short circuit), the RGB video output will continue to work ... use the composite video signal (instead of the sync output) as the ... monitors/VDUs need the sync signals. Without the sync, you get no ...
    1024MAK 1024MAK May 2016 Hardware
  • Need some help repairing an issue 3 spectrumI am looking for some help repairing an issue 3 speccy, here's what I tried so far. The speccy is not booting up correctly, when using the diagnos…

    ... />
    Can you see the video balford? It seems to work ... some more testing, in the video you see the screen 'freeze ... out at some points, in sync with the speccy pausing and ...
    patzik patzik August 2016 Hardware
  • Rolling display from RGB port on a +2Hi gang, after many years I finally decided today to attempt connecting my +2 to my Japanese RGB monitor. Using just the composite video pin only …

    ... is not detecting the vertical sync properly. I had thought maybe ... and it turned out the video wasn't grounded properly.
    MagicKnight MagicKnight August 2016 Hardware
  • Opus Discovery "the big switch on" (after 20 years)I have a few of these Opus Discovery's with different Eproms in that have not been swiched for 15-20 years or so . I am in no rush to switch any on …

    Summary of above video: the key points ( after disconnect ... and needs to be in sync. Clean this area and if ... electrical components here in the video above . The whole emphasis seems ...
    harriusherbartio harriusherbartio September 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 ... uses it as the vertical sync signal (I seem to remember ... socket. Now I know the video signal is a more complex ...
    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 …

    ... uses it as the vertical sync signal (I seem to ... power?[/quote]Err, what composite video output. There is no ... modification?

    A composite video signal will be significantly affected ... Ahhh, you mean the composite sync signal. The value of the ...
    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 ... work. Is a composite video signal available anywhere on this ... Sync signal, Vertical Sync, the three colours, and not need the composite video ... at all. Composite Video could then go ...
    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 …

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

    ... goes to the composite video input on the SCART ...
    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 …

    ... Sync', and then most cables just feed in the Composite Video ... . That uses the Composite Video as Composite Sync too.

    I ... 've also seen the Composite Video ... a +2, then the composite video could go to another TV ...
    joefish joefish October 2016 Hardware
<1…19202122232425…34>

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