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<1…78910111213>
  • ZX Spectrum 48k output yellow and jumpyI have a ZX Spectrum that I modded for composite output a few years a go. Lately they output started to be a bit jumpy during the first half hour. Th…

    ... you have access to an oscilloscope, it's just a matter ...
    kenwonders kenwonders January 2017 Hardware
  • 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…

    You need an oscilloscope and have a look if any of video signals is going out of the ULA (40077).

    Is any IC getting hot?
    Claudius Claudius February 2017 Hardware
  • 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…

    [quote="Claudius;897126"]You need an oscilloscope and have a look if any of video signals is going out of the ULA (40077).

    Is any IC getting hot? [/quote]

    no i have check them all
    xaris_sm xaris_sm February 2017 Hardware
  • Harlequin 128K minor problems.....Hi All, I've just assembled my Harlequin 128K kit, I had initial problems with it that I traced to not having soldered all of the pins on a couple…

    ... the test pattern with an oscilloscope.

    Greetings

    ingo ingo March 2017 Hardware
  • Harlequin Rev G - Decoupling Capacitors?Guys - I started assembling my Rev G Harlequin board over the weekend. Right after I picked it up and started loading parts, it struck me that there…

    ... joystick interfaces, IF1bis). Measurements with oscilloscope showes clean signals.

    ingo ingo March 2017 Hardware
  • Kempston interface schematic: wrong IC?Hi! I'm trying to learn about the inner workings of the speccy, and I thought that building a kemspton interface would help me learn about things lik…

    ... and a very ghetto DIY oscilloscope (JYE DSO138). I'll have ...
    Mikelone Mikelone March 2017 Hardware
  • Disabling the ROM without removing the whole thingHi! I've got my hands on a non-working issue 6a. I suspect the ROM may be bad, but other things may be faulty as well. I've read that in an otherwis…

    ... . You do need a multichannel oscilloscope or logic analyser for this ...
    1024MAK 1024MAK April 2017 Hardware
  • The BUSH cassette player CRS-132 Not for the Spectrum???So - I needed a new tape player for loading my spectrum games - and I thought - 'why not buy a brand new one - rather than an old machine which may h…

    ... , using a multimeter and an oscilloscope. Save yourself the pain and ...
    Tank Tank April 2017 Hardware
  • Understanding tape edgesI've never done any tape reading code. But I've read about these "edges" on multiple occasions. Trouble is I don't understand what they heck they are…

    ... on the screen of an oscilloscope), and draw a horizontal line ...
    RetroTechie RetroTechie April 2017 Development
  • 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 …

    ... external power supply, logic tester, oscilloscope etc.

    Yes bank ...
    RetroTechie RetroTechie April 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…

    ... .
    Do you posses an oscilloscope and ideally an EPROM-burner ...
    Mad Fritz Mad Fritz 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…

    ... 11, then use ideally an oscilloscope to check if composite video ...
    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 …

    ... see below captures from an oscilloscope:
    Pic 1. - yellow - the ...
    Claudius Claudius 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 …

    ... see below captures from an oscilloscope:
    Pic 1. - yellow - the ...
    1024MAK 1024MAK July 2017 Hardware
  • Trying to repair a Speccy 48k - No PulsingI've had this machine for ages. I'd I've been putting off fixing it for some time now. So a couple of days ago I pulled it apart and started prob…

    ... test gear (meter, logic probe, oscilloscope) so it's better to ...
    1024MAK 1024MAK July 2017 Hardware
  • ZX Spectrum 48K it only shows colored barsHello, I'm new to the forum and I need help with a ZX Spectrum 48K which I bought recently unfortunately defective. I want to mention that before t…

    ... check something with this mini-oscilloscope? (I just assembled one.. I ... .ebay.com/itm/DSO138-Digital-Oscilloscope-Kit-DIY-kit-parts-Acrylic ... should be made to the oscilloscope and which pins should be ...
    Trafic Trafic August 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…

    ... />
    Using a dual channel oscilloscope, you can also compare the ...
    1024MAK 1024MAK January 2018 Hardware
  • Nasty vertical pattern on a 128K Toast Rack via RGBI managed to fix the busted membrane on my [url="https://www.worldofspectrum.org/forums/discussion/55755/got-myself-a-128k-toast-rack-plus-a-simple-a…

    ... rails if you have an oscilloscope. Even if you don't ...
    1024MAK 1024MAK January 2018 Hardware
  • Quick questionHello, can someone tell me what the screen looks like when you power a 48k spectrum that has no ROM chip installed ? Thank you. François

    ... or elsewhere) I have an oscilloscope but I am no electronic ...
    FrancoisL FrancoisL February 2018 Hardware
  • Timex Sinclair palette in FUSE?Does FUSE support the Timex Sinclair colour palette? I've tried running appropriate software and rom but the palette stays the same as the Ferranti U…

    ... observe the voltages on an oscilloscope. BRIGHT has been observed to ...
    rga24 rga24 March 2018 Emulators
  • Making sound using the BEEPER in AssemblyI had a look at the the documentation but it doesn't make sense to me. To make music just the beeper all I have to do is send ones and zeros to one o…

    ... on! I used a simple oscilloscope program on my laptop so ...
    ivanb303 ivanb303 July 2018 Assembler
  • 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…

    ... actually took readings with an oscilloscope to make sure levels were ...
    Renegade Renegade August 2018 Hardware
  • 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…

    ... actually took readings with an oscilloscope to make sure levels were ...
    1024MAK 1024MAK August 2018 Hardware
  • Spectrum 48K / composite mod / LCD TV: voltages out of the ULAHello Spectrum World I have juste bought again my first computer on ebay... a Speccy 48k issue 2 with a 5C112E-2 ULA. Just had to replace TR4 and …

    ... look forward to seeing the oscilloscope traces from artVan, too. I ...
    paf paf November 2018 Hardware
  • Spectrum 48K / composite mod / LCD TV: voltages out of the ULAHello Spectrum World I have juste bought again my first computer on ebay... a Speccy 48k issue 2 with a 5C112E-2 ULA. Just had to replace TR4 and …

    ... TV, understand them, hook your oscilloscope and find out what is ...
    paf paf November 2018 Hardware
  • +3 - beeper sounds but no AY musicHi guys I am repairing a plus 3 revision 2 board that had no sound at all. Using schematics from https://zxnet.co.uk/spectrum/schematics/ I manage…

    ... with my cr*ppy little oscilloscope, it looks like all three ...
    colourclash colourclash May 2019 Hardware
  • +3 - beeper sounds but no AY musicHi guys I am repairing a plus 3 revision 2 board that had no sound at all. Using schematics from https://zxnet.co.uk/spectrum/schematics/ I manage…

    ... from the z80 with my oscilloscope in this resolution, so I ...
    colourclash colourclash May 2019 Hardware
  • +3 - beeper sounds but no AY musicHi guys I am repairing a plus 3 revision 2 board that had no sound at all. Using schematics from https://zxnet.co.uk/spectrum/schematics/ I manage…

    ... ’s desolder C38, stick the oscilloscope’s probe to the “+” pad ...
    Ast_A_Moore Ast_A_Moore May 2019 Hardware
  • +3 - beeper sounds but no AY musicHi guys I am repairing a plus 3 revision 2 board that had no sound at all. Using schematics from https://zxnet.co.uk/spectrum/schematics/ I manage…

    ... ’s desolder C38, stick the oscilloscope’s probe to the “+” pad ...
    colourclash colourclash May 2019 Hardware
  • +3 - beeper sounds but no AY musicHi guys I am repairing a plus 3 revision 2 board that had no sound at all. Using schematics from https://zxnet.co.uk/spectrum/schematics/ I manage…

    ... the following points with an oscilloscope while the “tape” is playing ...
    Ast_A_Moore Ast_A_Moore May 2019 Hardware
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