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<1…19202122232425…34>
  • Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…

    ... the Z80 CPU writes to video RAM. From this, it can ... internal video RAM.
    It then generates a standard RGB & sync ...
    1024MAK 1024MAK September 2013 Hardware
  • Clashbasher a new interface to reduce colour clashI've been working on this for a while now. [IMG]http://markamy.uwclub.net/cauldron.JPG[/IMG] Basicly its an add on for a 48k spectrum, which reinte…

    ... been meaning to rewrite the video drivers for a while but ... was stable. I sync'ed the vertical sync with the spectrum interupts ... lines gradually go out of sync over the course of the ...
    Basher Basher September 2013 Hardware
  • Clashbasher a new interface to reduce colour clashI've been working on this for a while now. [IMG]http://markamy.uwclub.net/cauldron.JPG[/IMG] Basicly its an add on for a 48k spectrum, which reinte…

    ... br /> I know the video driver is messy but ... :)
    the vertical sync is over complecated because I ... 't work with a video capture device I bought. ... so it works in sync with the video driver. At the ... the correct sequence in sync with the video.

    ...
    Basher Basher September 2013 Hardware
  • SE BasicAfter 13 years of development I thought I'd run out of things to optimize, but it turns out I was wrong. However, I'm now running out of time to work…

    ... printing.
    [*]Fast pilot signal sync.
    [*]Fast reset.
    [*]Four ... 7.
    [*]Sets the standard video mode on reset.
    [*]Shift ...
    chev chev October 2013 Sinclair Basic
  • Video problem on grey +2I have a bad video problem on grey +2. The computer is in a poor shape, but the major problem is with the video. With a (known good) SCART cable I ca…

    ... RGB signals and synthesise Composite Video for the modulator.
    ... 's a problem with the sync, though... let's see...< ... of hack, like feeding Composite Video on pin 20 (typically ... switching between RGB and Composite Video modes. That scenario is entirely ...
    skagon skagon October 2013 Hardware
  • Video problem on grey +2I have a bad video problem on grey +2. The computer is in a poor shape, but the major problem is with the video. With a (known good) SCART cable I ca…

    ... 's using the CVBS (Composite Video) signal in the place of ... pin 23 of the ULA (Sync). Somewhere between ULA pin 23 ...
    skagon skagon October 2013 Hardware
  • eBay 128K Spectrum RGB cables overheat the Spectrum!?Hi everybody, For a long time I've wondered why Spectrum 128K Toastracks were overheating when using my Retro Computer Shack RGB SCART cable. Today …

    ... to), definitely NOT the composite sync signal from the ULA.[/QUOTE ... ]

    You said Composite Sync and I thoght you were ... . What you call Composite Sync is Composite Video (CVBS) to me, hence ...
    Falco-F8L Falco-F8L October 2013 Hardware
  • Two more faulty onesCould I get your opinion on these two faults, please? Understanding these two cases would be very beneficial for my ZX education. Thanks! - A Spectr…

    ... this point ;) )

    Loss of video in a +2 would be ...
    balford balford November 2013 Hardware
  • +2 QuestionsI picked up a +2 today on eBay. I've only seen one about 25 years ago so i dont know a lot about them. It boots and the seller can type stuff in so …

    ... and original +2 includes composite video output, so it's possible ... /B, Amstrad ditched the composite video and replaced it with an ... for the Video output. There is Composite, 0V and Composite Sync that ...
    rune rune December 2013 Hardware
  • +2 QuestionsI picked up a +2 today on eBay. I've only seen one about 25 years ago so i dont know a lot about them. It boots and the seller can type stuff in so …

    ... for the Video output. There is Composite, 0V and Composite Sync that ...
    guesser guesser December 2013 Hardware
  • Toasted +3Oops.. I shorted one of my +3 (being clumsy with multimeter, doh) when measuring PSU connector pins :D Any immediate guesses what exactly died on thi…

    ... circuit will just see the loss of whichever non-ground supply ... connections via say the UHF/Video/Audio leads AND the 0V ...
    1024MAK 1024MAK December 2013 Hardware
  • Toasted +3Oops.. I shorted one of my +3 (being clumsy with multimeter, doh) when measuring PSU connector pins :D Any immediate guesses what exactly died on thi…

    ... which there would be no video clocks.

    However without ... and switches whether there are sync pulses or not. I think ...
    guesser guesser December 2013 Hardware
  • +2A/+3 composite modHi, Anyone has experience doing a composite output mod for +2A/+3? (yes.. I also have a working RGB) A while ago I did one based on the instruction…

    [QUOTE=guesser;742334]What s-video mod did you do? Was ... of the existing +2 video signals (vertical sync) and applied it to ...
    rga24 rga24 December 2013 Hardware
  • Settings on oscilloscope to see composite video signalHello, Learning a bit more about my new Owon digital 2 chan. oscilloscope. Would like to know what settings I should use to view a composite signal…

    ... you can select the video line you want to ... to recognise composite sync as a video waveform and trigger ... have to use a composite video output as below.
    sync outputs then it's ... just connect the composite video out to the trigger ...
    guesser guesser December 2013 Hardware
  • Settings on oscilloscope to see composite video signalHello, Learning a bit more about my new Owon digital 2 chan. oscilloscope. Would like to know what settings I should use to view a composite signal…

    ... started being equipped with basic video displays. "Digital" RGB just means ... except for maybe where the sync. signal is placed...i.e ... 'm using RGB and composite video for the Sync.

    t
    thomas3120 thomas3120 December 2013 Hardware
  • Settings on oscilloscope to see composite video signalHello, Learning a bit more about my new Owon digital 2 chan. oscilloscope. Would like to know what settings I should use to view a composite signal…

    ... using RGB and composite video for the Sync.

    t ... monitors. Composite video can be used as sync but after all ... there's the problem of sync polarity. Classic equipment sometimes ... outputs positive sync when it's expected only ...
    pkersey pkersey December 2013 Hardware
  • Settings on oscilloscope to see composite video signalHello, Learning a bit more about my new Owon digital 2 chan. oscilloscope. Would like to know what settings I should use to view a composite signal…

    ... monitors. Composite video can be used as sync but after all ... 's the problem of sync polarity. Classic equipment sometimes ... outputs positive sync when it's expected ... & 128k+). Both have great video though... interesting.

    ...
    thomas3120 thomas3120 December 2013 Hardware
  • 128k+ CompositeAm I to understand this correctly but all thats needed for composite video on this model is to run a wire from pin 1 of the RGB port to the phono out…

    ... is different.

    Composite video on pin 3 instead of ... pin 3
    No vertical sync pin

    No guarantees ...
    guesser guesser January 2014 Hardware
  • eBay 128K Spectrum RGB cables overheat the Spectrum!?Hi everybody, For a long time I've wondered why Spectrum 128K Toastracks were overheating when using my Retro Computer Shack RGB SCART cable. Today …

    ... seems to use the composite video as the RGB switching pin ... from the TEA2000 as the sync signal. That should - I reckon ... (you should never use a video signal as a constant voltage ... the ULA and the composite video pin.
    Of course I ...
    Spirantho Spirantho February 2014 Hardware
  • Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…

    ... the fact that the vertical sync input of that IC is ... vertical sync enable signal to teh vertical sync input of the video IC ... resulting in phase errors or sync problems on some screens. I ...
    ingo ingo February 2014 Hardware
  • +2 Grey video issueSo far ive replaced TR4, TR5 (and correctly orientated them) and seperated the audio from the video, still I have this; [youtube]mZZWOXRs_Zk[/youtube…

    ... />
    TR4 is the composite video amp - must be a high ...
    TR5 is the vertical sync amp - must be a high ... is not really suitable for video signals.

    As Balford ...
    1024MAK 1024MAK February 2014 Hardware
  • eBay 128K Spectrum RGB cables overheat the Spectrum!?Hi everybody, For a long time I've wondered why Spectrum 128K Toastracks were overheating when using my Retro Computer Shack RGB SCART cable. Today …

    ... , it uses the composite sync pin as composite video (which of course ... 're passing the composite video in as the sync).

    Interestingly ... the display chip sent a sync signal, the TV would think ...
    Spirantho Spirantho February 2014 Hardware
  • eBay 128K Spectrum RGB cables overheat the Spectrum!?Hi everybody, For a long time I've wondered why Spectrum 128K Toastracks were overheating when using my Retro Computer Shack RGB SCART cable. Today …

    ... to RGB cable where a sync signal is used for switching ... communities in how TV and video systems actually work. Let alone ...
    1024MAK 1024MAK March 2014 Hardware
  • Grey +2 DiedHi all, Thrashing my +2 playing Mugsy last night and it did this... [URL="https://m.flickr.com/photos/83515822@N05/13012551693/lightbox/"]https://m…

    ... that it produces a valid video signal reveals quite a lot ... too. Unlike the 48K Spectrums, loss of the 12 V supply ...
    Zorn Zorn March 2014 Hardware
  • ULA pinsHi I am trying to figure out where on the ULA , among other things, the VYU pins are. I have been reading schematics , but I am really lost when I …

    ... the sync pulse. It gets inverted by the composite video generation circuit ...
    guesser guesser March 2014 Hardware
  • We could design the LokiWouldn't it be great... if this community would develop what Sinclair himself started but was never finished: a successor of the 128K with 'cartoon l…

    ... come with analogue connections (composite video has already been dropped on ... that many HDMI displays can sync to a 50Hz frame rate ...
    Winston Winston March 2014 Hardware
  • Totally random idea for the hardware nuts to exploreWhen it comes to multi-player games, how hard would it be to generate a second display from a single Speccy, instead of trying to link up machines, s…

    ... needs this signal to sync the video signal with the one output ... order to generate another (different) video image, 16Kb will allow not ...
    lfaria lfaria April 2014 Hardware
  • Totally random idea for the hardware nuts to exploreWhen it comes to multi-player games, how hard would it be to generate a second display from a single Speccy, instead of trying to link up machines, s…

    ... the same pin for the video out as the tape out ... around how it generated its video with the nmi and looking ... ?

    Maybe share the sync signals from the normal composite ... sync signal but connect the ear ...
    Basher Basher April 2014 Hardware
  • C64 for the PiSomeone is writing the C64 natively for the Rasberry Pi and it looks amazing. I hope this will make someone do a ZX Spectrum too. Take a look its a…

    ... kHz refers to the horizontal sync frequency.

    It's ... system M have a horizontal sync frequency of 15.75 KHz ... but in NTSC-M broadcast video the framerate is actually 29 ...
    guesser guesser April 2014 Chit chat
  • C64 for the PiSomeone is writing the C64 natively for the Rasberry Pi and it looks amazing. I hope this will make someone do a ZX Spectrum too. Take a look its a…

    ... kHz refers to the horizontal sync frequency.

    It's ... system M have a horizontal sync frequency of 15.75 KHz ... but in NTSC-M broadcast video the framerate is actually 29 ... 't see (sorry!). Is 'horizontal sync frequency' the frequency you had ...
    ewgf ewgf April 2014 Chit chat
<1…19202122232425…34>

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