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<1…16171819202122…34>
  • Repair Zx Spectrum +2 Blackhello there, just found a Zx Spectrum +2 Black edition Issue 1 board that doesnt appear anything on the screen, even led dont power on,i have tes…

    ... ASIC (IC1) into a Composite video signal.
    There's no point ...
    Peter Mulholland Peter Mulholland February 2017 Hardware
  • Scart Leads for spectrumHi, I was going through my stuff the other day and found I have all the bits for making spectrum scart leads. I was going to ebay them but thought …

    ... sound is mixed with the video signal so that sound is fed ...
    1024MAK 1024MAK February 2017 Sinclair Miscellaneous
  • Connecting a PC's VGA monitor to speccy's RGB...I've searched the entire web for this... can anyone help me? I want to talk with my speccy...

    There is no easy way to interface a 15KHz video signal, to a 31KHz CRT VGA monitor. Scandoubling involves line buffering memory.

    There are however off the shelf solutions such as the GBS 8200 board.
    Peter Mulholland Peter Mulholland February 2017 Sinclair Miscellaneous
  • How to connect a ZX Spectrum to a QL (RGB) monitorI recently acquired a pretty nice (old) original QL Vision color monitor. It works GREAT with the QL and the ZX 128K. The normal ZX Spectrum however,…

    Err, the ULA has three video output pins called 'U', 'V' ... ' is an inverted monochrome composite video signal (although the levels are different ...
    1024MAK 1024MAK February 2017 Hardware
  • Spectrum 128k 2a or not 2b....Just picked up a +2 black case version and I'm in as little bit of a quagmire, The case is definitely black, has '+2A' stamped on the bottom, but in…

    ... normally just feed the same signal in left and right.
    The problem with the blanking signal is that the voltage on ... blanking pin is effectively a video signal input). This means that the ... 's now no 12 volt signal which is what you want ...
    guesser guesser April 2017 Hardware
  • Spectrum 128k 2a or not 2b....Just picked up a +2 black case version and I'm in as little bit of a quagmire, The case is definitely black, has '+2A' stamped on the bottom, but in…

    ... has the impedance of a video signal (75ohm) so it makes sense ...
    Renegade Renegade April 2017 Hardware
  • Spectrum 128k 2a or not 2b....Just picked up a +2 black case version and I'm in as little bit of a quagmire, The case is definitely black, has '+2A' stamped on the bottom, but in…

    ... has the impedance of a video signal (75ohm) so it makes sense ... voltage range for 4:3 video is 9.5 to 12 ... [i]outputs[/i] a switching signal on pin 8 of a ...
    guesser guesser April 2017 Hardware
  • ZX Spectrum Test PCB I recently read about one of these (I think it may have been the Retroleum site but I am not sure) and I thought "What a great idea" . As pictured …

    ... modulator, the other is the video signal.

    Why refit a ... would have thought a composite video modification would be a better ...
    1024MAK 1024MAK May 2017 Hardware
  • ZX Spectrum Test PCB I recently read about one of these (I think it may have been the Retroleum site but I am not sure) and I thought "What a great idea" . As pictured …

    ... possible to do a composite video mod without a modulator already ... 100uF capacitor (positive) to the video signal output next to the modulator ...
    Claudius Claudius May 2017 Hardware
  • Whats the best composite or Rgb video signal to HDMI convertor boxIm looking at this one which is 20 pounds http://www.ebay.co.uk/itm/192200878335 there are good reviews on youtube, plus it does composite or r…

    ... /> I never tried a composite video signal.

    I'm sure ...
    1024MAK 1024MAK June 2017 Hardware
  • Whats the best composite or Rgb video signal to HDMI convertor boxIm looking at this one which is 20 pounds http://www.ebay.co.uk/itm/192200878335 there are good reviews on youtube, plus it does composite or r…

    ... extra time to process the video signal, then the LCD TV will ...
    MatGubbins MatGubbins June 2017 Hardware
  • Repair ZX Spectrum +2 black issue 1Hi all, after a long time i will try to repair a ZX Spectrum +2 black i found the last days i know for sure that CPU is damaged (already repla…

    ... and TR3 form a video amplifier for the video signal going into the ...
    1024MAK 1024MAK June 2017 Hardware
  • Repair ZX Spectrum +2 black issue 1Hi all, after a long time i will try to repair a ZX Spectrum +2 black i found the last days i know for sure that CPU is damaged (already repla…

    Vcc is correct.
    TAE2000 is for composing the video signal from ULA input and feeding it to the tuner, so nothing you have to worry about atm (as you get a picture via RGB).
    Mad Fritz Mad Fritz June 2017 Hardware
  • ZX Nuvo 128..Hi There, I have built the ZX Nuvo 128 by Superfo, but it has a problem. The machine is working, but the video signal is completely bonkers. I've …

    ... the 74HC04 on the board. Video signal is good, no issues. I ...
    redhawk668 redhawk668 June 2017 Hardware
  • Real 60Hz NTSC 48K ZX SpectrumNot a 3rd party mod. The joystick mod was added by the user, but the board and the computer is exactly what was sold in Chile, South America. We migh…

    Does the Spectrum NEXT output a ntsc video signal whith the proper ntsc ULA timings?
    Renegade Renegade June 2017 Hardware
  • Recent hardware acquisitionsWell, not actually that recent but I've not had time to look at them until a few days ago... Two Speccy +'s. Both are semi alive. Both have semi d…

    ... />
    Taking a feed (composite video) from the input connection of ... on how and where the video signal inversion is done, you need ... you a useable monochrome composite video signal.

    So yes, if ...
    1024MAK 1024MAK July 2017 Chit chat
  • What is the maximum fps the spectrum can achieve?I have been doing some reading and from what I understand the Spectrum outputs a PAL signal, but that means it will display @50fps or @25fps? If t…

    ... D6=1 #FF. In the video signal Vsync cannot be disabled.
    Black_Cat Black_Cat August 2017 Hardware
  • What is the maximum fps the spectrum can achieve?I have been doing some reading and from what I understand the Spectrum outputs a PAL signal, but that means it will display @50fps or @25fps? If t…

    ... a 50fps (ish) non-interlaced video signal.

    When people talk ... the VSYNC signal that indicates the start of a video frame. That ... synchronise that with the VSYNC signal (by HALTing the CPU) ... comes to 8-bit machines, video time was so limited that ...
    AndyC AndyC August 2017 Hardware
  • Issue with TV signal + Inductor Coil (16K Issue 2 Speccy)Hello guys, I just got a 16K Issue 2 Speccy from eBay. It was sold as not working so I knew there would be some work needed before it's working ag…

    ... the limitations of a composite video signal :-(

    [b][i]Mark ...
    1024MAK 1024MAK August 2017 Hardware
  • I'm totally confused now, RGB, composite, SCART what?Hello everyone. I have a +2A coming from the UK and I am wondering how I'm going to connect it to a modern TV. The TV has inputs on the back that ar…

    ... line, 15625Hz line, 50Hz field video signal (regardless of the output used ... colour encoding to the composite video signal which is what is fed ...
    1024MAK 1024MAK August 2017 Hardware
  • I'm totally confused now, RGB, composite, SCART what?Hello everyone. I have a +2A coming from the UK and I am wondering how I'm going to connect it to a modern TV. The TV has inputs on the back that ar…

    ... RF out this has the video signal modulated onto a RF frequency ... Right sound channels.
    The video signal is still combined onto one ... signal ie the Red, Green and ... /48 outputs this type of video signal hence, they can be modded ...
    ivanb303 ivanb303 August 2017 Hardware
  • I'm totally confused now, RGB, composite, SCART what?Hello everyone. I have a +2A coming from the UK and I am wondering how I'm going to connect it to a modern TV. The TV has inputs on the back that ar…

    ... with a (slightly degraded) composite video signal.

    Because the original ... display a TV standard RGB video signal.

    For some reason ... YCbCr signal. YPbPr is designed for the interconnection of commercial video equipment ...
    1024MAK 1024MAK August 2017 Hardware
  • Real 60Hz NTSC 48K ZX SpectrumNot a 3rd party mod. The joystick mod was added by the user, but the board and the computer is exactly what was sold in Chile, South America. We migh…

    Someone just tipped me that the Brazzilian ZX Spectrum Clone TK90X can output a NTSC video signal.

    Does this mean that spectrum games that run faster with the Ferranti NTSC ULA will run as fast on a TK90X NTSC?
    Renegade Renegade September 2017 Hardware
  • Spectrum 128k +2 video issueHi Guys, I just got a Spectrum 128k +2 from ebay. It came with its power supply and the scart video cable. The machine is working pretty good but …

    ... wire --> pin 16 Blanking signal & RGB-selection control ... wire --> pin 11 Green video signal
    Pin 7 --> ... wire --> pin 15 Red video signal
    Pin 8 --> ... wire --> pin 7 Blue video signal
    [/code]

    ...
    1024MAK 1024MAK September 2017 Hardware
  • Spectrum 128k +2 video issueHi Guys, I just got a Spectrum 128k +2 from ebay. It came with its power supply and the scart video cable. The machine is working pretty good but …

    ... to show RGB video or a non-existing composite video signal (so you ... a mix of both RGB video and noise.

    [b ...
    1024MAK 1024MAK September 2017 Hardware
  • Spectrum 128k +2 video issueHi Guys, I just got a Spectrum 128k +2 from ebay. It came with its power supply and the scart video cable. The machine is working pretty good but …

    ... normally carry either composite video, RGB video, or S-Video. However, your +2 ... there is no S-video signal and no composite video signal for the upscaler ...
    1024MAK 1024MAK September 2017 Hardware
  • Memory Contention: A Hypothetical Fix?I have just had this crazy thought: If one were to wire an additional memory chip, say a 6264 8Kx8 SRAM, in parallel with the main memory so that it …

    ... ULA stops the z80 clock signal, but can't this be ... own generator, and external video RAM. The video signal should also be generated ...
    Black_Cat Black_Cat September 2017 Hardware
  • 50 Hz / 60 Hz switch in Timex Computer 2068I'm not sure if this is common knowledge, I've certainly never read about it online, though it may be documented in Portuguese or Polish. There is a…

    @Black_Cat: But why not?

    I have other devices that output PAL-60 video signal and I get color on PAL TVs and monitors.
    Renegade Renegade October 2017 Hardware
  • 50 Hz / 60 Hz switch in Timex Computer 2068I'm not sure if this is common knowledge, I've certainly never read about it online, though it may be documented in Portuguese or Polish. There is a…

    ... devices that output PAL-60 video signal and I get color on ... .[/quote]
    This non-standard signal is a method used in ...
    Black_Cat Black_Cat October 2017 Hardware
  • Most accurate display on emulatorWhich Windows emulator has the most accurate display. I am making a game and one of the tiles is not showing correctly on an real spectrum +2 machin…

    ... via RF/UHF or composite video and the brightness, contrast and ... on machines were a RGB signal is being used, it means ... can be forgotten (the video signal bandwidth and hence level of ...
    1024MAK 1024MAK October 2017 Emulators
<1…16171819202122…34>

Latest Posts

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