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<1…17181920212223…34>
  • 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
  • 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
  • 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…

    ... on machines where a RGB signal is being used, it means ... can be forgotten (the video signal bandwidth and hence level of ...
    Ast_A_Moore Ast_A_Moore October 2017 Emulators
  • Interference when using modern PSUMy 48k revision 3 spectrum with a basic 1 wire composite video mod works perfectly with the original power supply. However When I use a modern regula…

    ... to be in the baseband video signal range (from 5Hz up to ... in use), then a composite video signal may well be affected :(
    1024MAK 1024MAK October 2017 Hardware
  • Interference when using modern PSUMy 48k revision 3 spectrum with a basic 1 wire composite video mod works perfectly with the original power supply. However When I use a modern regula…

    ... mode noise to interfere with video signal.

    If this helps ...
    ingo ingo October 2017 Hardware
  • What clone for the USA?Living in America, so fellow ex-pats might be able to answer this. Yes, I know I can do a search but why not ask first as knowledge beats enquiries. …

    ... the only problem is the video output / screen. Ideally you ... line, 15625kHz, 50Hz PAL video signal. It is unlikely that you ... when connected via composite video (external video, normally on a yellow ... line, 15625kHz, 50Hz PAL video signal, that could be used to ...
    1024MAK 1024MAK November 2017 Chit chat
  • 48k packed up after cap changeHi all, I'm relatively new to the Sinclair world, my 8-bit repairs in past was lurking in the dark sides of Acorn, Amstrad and Commodore! I've got…

    ... screen RAM and creates the video signal). The Z80 CPU is not ...
    1024MAK 1024MAK December 2017 Hardware
  • 48k packed up after cap changeHi all, I'm relatively new to the Sinclair world, my 8-bit repairs in past was lurking in the dark sides of Acorn, Amstrad and Commodore! I've got…

    ... screen RAM and creates the video signal). The Z80 CPU is not ... /> Watching a zx.zigg.net video he noted that a failing ...
    dozey_dustman dozey_dustman December 2017 Hardware
  • ZX Spectrum Issue 4S composite video fuzzy (horizontal blur)Dear people of WoS, Thank you very much for taking the time to read. I have an Issue 4S I recently acquired and planned to fix up as a gift for a…

    ... they are processing "baseband" video signals of up to about ... type (these are fast video amplifier transistors). MPS2369 are ... also compare the ULA monochrome video output signal /Y (ULA pin ... underside) with the composite video signal on TR2 emitter or edge ...
    1024MAK 1024MAK January 2018 Hardware
  • ZEsarUX 6.1 BETAHi I have uploaded a new ZEsarUX BETA version 6.1. You can download it from the usual beta url: https://sourceforge.net/projects/zesarux/files/…

    ... used to generated the composite video signal.

    On a 16K ...
    rga24 rga24 February 2018 Emulators
  • 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 …

    ... able to lock onto the signal.

    I get it ... .

    I suspect the video signal for the initial boot and ... actually be different to the signal after the BIOS has been ...
    colonel32 colonel32 May 2018 Hardware
  • Better keyboard = better sales ?Just a random thought. I want to start this by saying although I did not have a + model new, I was never really a fan of this keyboard as it was n…

    ... with a link so the video never made it to the ... poor picture when using composite video via the edge-connector [I ... boards did not have the video signal at the edge-connector. Something ... type leads perhaps for the video signal and / or not realising the ...
    spider spider August 2018 Sinclair Miscellaneous
  • New video about S-video modification on Issue two 48K Spectrum.I just finished an s-video modification on an Issue two 48K Spectrum so I made a video about it. Most of the technical details are in the video; if y…

    Here is a video of the result with S-video signal. Pretty nice :-)
    https://youtu.be/g7OkWTfyed8
    repetto74 repetto74 September 2018 Hardware
  • Oric Atmos HelpMaybe a bit of a long shot but there are enough skilled people here, so hopefully I can get some thoughts please. OK I have an Oric Atmos here, it…

    ... analogue TV system used positive video modulation, whereas in the ... we use/used a negative video modulation. This very likely ... support components. It inverts the video signal. [You find a similar ... remove the video modification and return the video circuit back ...
    1024MAK 1024MAK September 2018 Chit chat
  • Better graphic in new ZX gamesLCD TV (ideally full hd) used with ZX Spectrum enable using new graphic modes with 2x higher vertical resolution, more colors and without attribute c…

    ... ) convert the 50 Hz input video signal into a 25 Hz one ...
    Ast_A_Moore Ast_A_Moore September 2018 New game ideas
  • Oric Atmos HelpMaybe a bit of a long shot but there are enough skilled people here, so hopefully I can get some thoughts please. OK I have an Oric Atmos here, it…

    ... :

    1. The composite video signal feeding the modulator does not ... cursory Google does suggest the signal is too weak anyway.
    spider spider September 2018 Chit chat
  • Oric Atmos HelpMaybe a bit of a long shot but there are enough skilled people here, so hopefully I can get some thoughts please. OK I have an Oric Atmos here, it…

    ... :

    1. The composite video signal feeding the modulator does not ... suggest the signal is too weak anyway.[/quote]
    The video circuitry ... ohm load of a composite video circuit. So this is not ...
    1024MAK 1024MAK September 2018 Chit chat
  • Oric Atmos HelpMaybe a bit of a long shot but there are enough skilled people here, so hopefully I can get some thoughts please. OK I have an Oric Atmos here, it…

    ... :

    1. The composite video signal feeding the modulator does not ... suggest the signal is too weak anyway.[/quote]
    The video circuitry ... ohm load of a composite video circuit. So this is not ... strong enough to drive the video-in circuitry in a tv ...
    spider spider September 2018 Chit chat
  • New video about S-video modification on Issue two 48K Spectrum.I just finished an s-video modification on an Issue two 48K Spectrum so I made a video about it. Most of the technical details are in the video; if y…

    ... having troubles with this S-video mod unfortunately. I decided ... day I had a bad video signal and I though the ... not have any video signal at all for s-video so I ... has fried into the video circuitry of the Spectrum ... just no luck and no signal at all. I do ...
    repetto74 repetto74 September 2018 Hardware
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