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Search Again :: Adv Search 1000 results in 0.014s
<1…15161718192021…34>
  • Some downloads fail meI want download the schema of the Spectrum +2A and I can not because appears a user and password request in all links of "SCHEMATICS, MANUALS AND TEC…

    The sound is mixed into the video signal before it gets to the modulator.

    [b][i]Mark[/i][/b]
    1024MAK 1024MAK November 2015 Hardware
  • Some downloads fail meI want download the schema of the Spectrum +2A and I can not because appears a user and password request in all links of "SCHEMATICS, MANUALS AND TEC…

    ... then added to the video signal at the colour encoder chip ... either remove the sound signal from the video signal (cut, or desolder ... that the sound signal is mixed with the video signal at a ... picture when using the composite video signal that is available at ...
    1024MAK 1024MAK November 2015 Hardware
  • 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…

    ... ). The result is a composite video signal.

    The ... modulator takes the composite video signal and mixes it with ... the composite video signal. Having got the composite video signal, the TV ... degradation of the analogue signal, and of course every ...
    1024MAK 1024MAK November 2015 Hardware
  • Were there other graphic modes for the ZX Spectrum?I've read that there was a "hi-color" mode that allowed the color clash to be 8x1 instead of 8x8. Maybe I have the name of that mode wrong. I'm…

    ... not allowed to build the video signal, (as in FAST mode) you ... there is officially only one "video mode".

    Then ... So that meant no special video graphics chips were to be ... Research, they developed their own video circuits and designed them into ...
    1024MAK 1024MAK November 2015 Hardware
  • velleman k8036 - Video signal cleaning?http://www.velleman.eu/products/view/?country=es&lang=en&id=348080 Although velleman reports having discontinued this kit and its primary use was …

    ... no special improvement to the signal of a ZX Spectrum suing ... to mask the macro vosion signal. A 4066 C-MOS switch ... to cut of macro vision signal. There is no need for ... circuitry to improve the Spectrums video signal.
    Ingo.
    ingo ingo November 2015 Hardware
  • Bluetooth ZX Spectrum - I may be alone, but I love it!Playing Hungry Horace on a big telly with this on my lap made me feel like a teen again! Happy happy days! Anyone else feel the love for it?

    ... ZX Spectrum to send 'composite' video signal which can be more appropriate ...
    Jim M Jim M November 2015 Hardware
  • Composite picture qualityI have read many many discussions here about the composite video modification of the Spectrum 16/48K models. I have choosen one of the simplest comp…

    ... that voltage levels in composite video signal drop (=darker), not a little ... regulators (or -converters) and in video encoder / ULA supply lines. A ... of series capacitor in composite video output. 47uF may work but ...
    RetroTechie RetroTechie December 2015 Hardware
  • Composite picture qualityI have read many many discussions here about the composite video modification of the Spectrum 16/48K models. I have choosen one of the simplest comp…

    ... that voltage levels in composite video signal drop (=darker), not a little ... regulators (or -converters) and in video encoder / ULA supply lines. A ... of series capacitor in composite video output. 47uF may work but ...
    1024MAK 1024MAK December 2015 Hardware
  • Jiiira's Sparrow LITEHi All, Just for info .. :) big eprom, cheap 32KB ram and etc. i don't know specification .. :) https://youtu.be/NbI7E1aebrM modern speccy .. …

    ... not fit right .. :)
    video signal is bad like original speccy ... improvements:


    - video output is now the Composite ...

    - the video RAM is in single SRAM ... br />
    - the /RESET signal is done by TL7705 watchdog ...
    gorski gorski December 2015 Hardware
  • Harlequin Rev. G - Composite video problem.What I'm about to describe I'm not experiencing it by myself, so the probable answer to any "have you tested this or that" question is no, I don't, b…

    I am not familiar with the Harlequin or its specs but I can tell you that if a C=1084S gives a black and white picture with CVBS then it's because the video signal is not PAL standard.
    Renegade Renegade 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…

    ... /> looks like the spectrum rgb signal was never fully complaint and ... able to create a composite video signal, same chip is used in ...
    Level20 Level20 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…

    ... display the composite sync signal as the composite video signal (which it effectively ... is - just a video of a ...
    guesser guesser February 2016 Hardware
  • Emulator developmentHi, Could anyone explain or direct to a link that explains in not to technical terms how an emulator is developed. It has always blown my mind eve…

    ... , processor, keyboard and i/o, video generator. Then work out what ... not doing an accurately timed video signal. Instad, at some point equivalent ... 50Hz interrupt, just grab the video memory and converting it into ... fetching memory to form the video signal.
    joefish joefish March 2016 Emulators
  • Bizarre ZX Spectrum faults (also possibly relevant to Spectranet compatibility problems).I'm attempting to repair an issue 4A 48K ZX Spectrum and am encountering some very strange problems. For my own records I've given this computer the …

    ... Vcc lines that reach the video signal. If you use the ... the pin corresponding to the video signal at the modulator input of ... H) in series to the video signal to cut high frequency ( ... spikes) from the video signal.

    The principle ...
    ingo ingo April 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 ULA but by the signal processing of the analog input ... TEA2000 that reduces interference between video signal and colour carrier then the ... TEA2000 gives very good composite signal comparable to that 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…

    ... ,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
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Latest Posts

  • I am currently watching.....
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    John Elliott on April 21
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