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Search Again :: Adv Search 632 results in 0.001s
<1…16171819202122>
  • +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 ...
    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…

    ... square wave at (what my oscilloscope says) is 444Hz

    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…

    ... at first then nothing. The oscilloscope showed low level waves of ... been calibration errors on the oscilloscope?) When not playing the sound ... when trying to calibrate the oscilloscope using the clock pin on ...
    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…

    Have you checked the +5V supply for noise / ripple using a ‘scope? Use AC coupling, auto mode and don’t worry about trying to get a synchronised/locked waveform.

    [b][i]Mark[/i][/b]
    1024MAK 1024MAK 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 +5v rail with my oscilloscope, starting with the power socket ...
    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…

    ... was waiting for a better oscilloscope (which hasn't turned up ...
    colourclash colourclash July 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…

    ... transmit power as a AC waveform, with the frequency being 50Hz ...
    1024MAK 1024MAK July 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…

    ... transmit power as a AC waveform, with the frequency being 50Hz ...
    colourclash colourclash July 2019 Hardware
  • Finding a good (UK) external switch mode power supply for the basic 48k and 128k ZX SpectrumsThis idea has probably "done the rounds" by now . I think I have heard about it a bit late . This thread with look at replacing the original "heavy l…

    ... for this is however, an oscilloscope.

    Using this, it ...
    1024MAK 1024MAK October 2019 Hardware
  • Gaaaahhhghh! Christmas (Lights)Tis the season to be a grumpy old git. Its now December and as is customary in the USA, after thanks giving the decorations 'must' come out. I've …

    ... them on when the AC waveform passes through zero volts is ...
    1024MAK 1024MAK December 2019 Chit chat
  • MakeTZX problemsApologies if this is in the wrong forum; I wasn't really sure what to put it under. So I'm just dipping my toe into making TZX files from my casse…

    ... and "regenerate" the waveform (if the original waveform has not lost in ...
    Zup Zup February 2020 MIA/STP/SDP
  • ZX Interface 1Hi, I have a ZX Interface 1 which I have bought online. It does not seem to work. When using CAT1 or any other specific commands, the compute…

    ... probe, logic analyser or an oscilloscope to see ROMCS change state ...
    1024MAK 1024MAK February 2020 Hardware
  • scientific graphicsJust starting this thread to post a few graphics I have done to amuse myself - which i might use at some point, or if others want to modify them and …

    Yes ,be serious these days it should be the female scientist chatting up the spotty lab assistant call Flo.

    How about an oscilloscope?
    Luny Luny April 2020 Development
  • scientific graphicsJust starting this thread to post a few graphics I have done to amuse myself - which i might use at some point, or if others want to modify them and …

    Yes an oscilloscope, I'll have a go ... when I turned on an oscilloscope - it said "Surprise, surprise..." - it ...
    dmsmith dmsmith April 2020 Development
  • scientific graphicsJust starting this thread to post a few graphics I have done to amuse myself - which i might use at some point, or if others want to modify them and …

    [quote="Luny;965317"]Yes ,be serious these days it should be the female scientist chatting up the spotty lab assistant call Flo.

    How about an oscilloscope?[/quote]

    Ast-Moore is in a different era of comedy schtick :-D
    dmsmith dmsmith April 2020 Development
  • scientific graphicsJust starting this thread to post a few graphics I have done to amuse myself - which i might use at some point, or if others want to modify them and …

    ... finished with masks, including an Oscilloscope and Syringe

    [img ...
    dmsmith dmsmith April 2020 Development
  • Son et Lumiere - a lightsynth from 1985.I wrote this back in 1985, inspired by Jeff Minter's Psychedelia; I think I was the only person who actually bought the Spectrum version! I wanted…

    ... I assumed that the incoming waveform was being filtered and that ...
    mik3d3nch mik3d3nch April 2020 Software
  • ZX Spectrum 48K Issue 4B No soundHi, I have a ZX Spectrum 48K Issue 4B without sound. I tested the ULA on another Spectrum and works fine, tested the speaker and it has the correct …

    ... of the TR7 with an oscilloscope (if you have one) or ...
    Ast_A_Moore Ast_A_Moore May 2020 Hardware
  • Spectrum 128k advice neededHi, I'm new to this forum and the spectrum world. I have this spectrum "toastrack" that was working fine until today. It doesn't boot anymore, it s…

    ... know for sure without an oscilloscope, but you could try the ...
    Ast_A_Moore Ast_A_Moore July 2020 Hardware
  • Spectrum 128k advice neededHi, I'm new to this forum and the spectrum world. I have this spectrum "toastrack" that was working fine until today. It doesn't boot anymore, it s…

    ... , or have access to an oscilloscope, do you have a logic ...
    1024MAK 1024MAK July 2020 Hardware
  • Upper memory not available in issue 2A friend send me his issue 2 Spectrum for diagnosis. It boots okay but for some reason won't load games over 16kB. He sent also a Smart Card with int…

    Likewise. I’m going to go through the necessary traces and solder points once more. If that doesn’t shed any light, I think it’s about time to invest into an oscilloscope.
    protek protek September 2020 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…

    With help from redhawk668, the problem is identified. (Atleast) my issue 3 board drops sync when entering the divMMC menu, confirmed with oscilloscope. Works OK on two different issue 2 boards.
    jani jani November 2020 Hardware
  • ZX80 in a BoxAfter putting a [url="https://worldofspectrum.org/forums/discussion/57916/spectrum-in-a-box#latest"]Spectrum in a Box[/url] a while ago, I thought it…

    ... the video signal with an oscilloscope and found that it looked ...
    xelalex xelalex January 2021 Hardware
  • The "Fun" of old equipment...Warning to others with the Alphacom 32.So I manage to slowly rebuild my spectrum, and a part of that is getting a new printer. The Brother printer I once had is no more, and I don't want t…

    ... , rather than throughout the AC waveform cycle.

    [b][i ...
    1024MAK 1024MAK March 2021 Hardware
  • 128K refurb.... What is the best way?Here's the latest Spectrum I got... Finally got a Toastrack... Not sure if it was good value ( around US$100 ). [img]https://os.blackice.com.au/us…

    ... from it according to the oscilloscope suggest a RAM failure still ...
    cj7hawk cj7hawk March 2021 Hardware
  • 128K refurb.... What is the best way?Here's the latest Spectrum I got... Finally got a Toastrack... Not sure if it was good value ( around US$100 ). [img]https://os.blackice.com.au/us…

    ... 't find. I used an oscilloscope to confirm the ROM was ...
    cj7hawk cj7hawk July 2021 Hardware
  • Things that people >= 40 (ish) would recognize (and others would likely not)#1: Used to see these all over the place, usually right above the bath tub. [img]http://www.constructionphotography.com/ImageThumbs/A052-01718/3/A0…

    Well it's still digitally encoded, so it's just the analogue waveform uncompressed then I guess, like how a CD is just a 14.4K WAV file.
    Paradigm Shifter Paradigm Shifter October 2021 Chit chat
  • 16pf Capcitors for C72/C73 issue 3b. Can I use 18pf?Looking at the service manual it states to use a 16pf ceramic disc capacitor in positions C72 and C73 on issue 3b boards. Is this very critical in bo…

    ... also a vintage crt 20Mhz oscilloscope coming my way soon, which ...
    Your Spec-chum Your Spec-chum November 2021 Hardware
  • New release of ZEsarUXFound today by chance on: [url]https://github.com/chernandezba/zesarux/releases/tag/10.1-13122021[/url] [quote]ZEsarUX-10.1 Beta1 Pre-release che…

    ... only one line (like Audio Waveform)
    -fixed gitches resizing some ...
    Luzie Luzie February 2022 Emulators
  • New release of ZEsarUXFound today by chance on: [url]https://github.com/chernandezba/zesarux/releases/tag/10.1-13122021[/url] [quote]ZEsarUX-10.1 Beta1 Pre-release che…

    ... only one line (like Audio Waveform)
    -Fixed glitches resizing some ...
    Luzie Luzie May 2022 Emulators
<1…16171819202122>

Latest Posts

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    harriusherbartio on 11:21AM
  • Fixed Speccy Software. And which games remained unfixed?
    harriusherbartio on 11:01AM
  • New video about S-video modification on Issue two 48K Spectrum.
    Renegade on April 21

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