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Search Again :: Adv Search 385 results in 0.001s
<1…78910111213>
  • ZX Spectrum issue 6a - yellow border problem<p>Hello!</p><p>I have problem with my Sinclair ZX Spectrum issue 6A, 48K. </p><p>I have changed low memory (all 4116 IC's) and coil, all electrolyti…

    ... .I don't have an oscilloscope, but I will try to ...
    zxuser zxuser May 2015 Hardware
  • ZX Spectrum issue 6a - yellow border problem<p>Hello!</p><p>I have problem with my Sinclair ZX Spectrum issue 6A, 48K. </p><p>I have changed low memory (all 4116 IC's) and coil, all electrolyti…

    ... the diode.
    With the oscilloscope you should check the quality ...
    HZJ HZJ May 2015 Hardware
  • ZX Spectrum issue 6a - yellow border problem<p>Hello!</p><p>I have problem with my Sinclair ZX Spectrum issue 6A, 48K. </p><p>I have changed low memory (all 4116 IC's) and coil, all electrolyti…

    ... OK.

    With the oscilloscope check also the quality of ...
    HZJ HZJ May 2015 Hardware
  • ZX Spectrum issue 6a - yellow border problem<p>Hello!</p><p>I have problem with my Sinclair ZX Spectrum issue 6A, 48K. </p><p>I have changed low memory (all 4116 IC's) and coil, all electrolyti…

    ... mind that when using an oscilloscope, the logic levels for "TTL ... />
    You should use a oscilloscope rated at 20MHz or higher ...
    1024MAK 1024MAK May 2015 Hardware
  • ZX Spectrum issue 6a - yellow border problem<p>Hello!</p><p>I have problem with my Sinclair ZX Spectrum issue 6A, 48K. </p><p>I have changed low memory (all 4116 IC's) and coil, all electrolyti…

    Thanks for your responses, HZJ and Mark!I will try to find an oscilloscope in next week, and when I do, I will post results here.
    zxuser zxuser May 2015 Hardware
  • ZX Spectrum issue 6a - yellow border problem<p>Hello!</p><p>I have problem with my Sinclair ZX Spectrum issue 6A, 48K. </p><p>I have changed low memory (all 4116 IC's) and coil, all electrolyti…

    Hello!Pictures from oscilloscope (Z80):pin 06:
    pin 16,17, 18, 20, 23, 24,25 ,26 (around 5V)
    pin 19
    pin 21
    pin 22
    pin 27
    pin 28Oscilloscope - Hameg HM103Y (5V scale), X (1us scale).
    zxuser zxuser June 2015 Hardware
  • ZX Spectrum issue 6a - yellow border problem<p>Hello!</p><p>I have problem with my Sinclair ZX Spectrum issue 6A, 48K. </p><p>I have changed low memory (all 4116 IC's) and coil, all electrolyti…

    ... :

    1) With the oscilloscope check also the quality of ...
    HZJ HZJ June 2015 Hardware
  • ZX Spectrum issue 6a - yellow border problem<p>Hello!</p><p>I have problem with my Sinclair ZX Spectrum issue 6A, 48K. </p><p>I have changed low memory (all 4116 IC's) and coil, all electrolyti…

    Hello!I checked voltage on pin8 and it is:
    It is around 12V on oscilloscope (10.9V when I check with multimeter) with this little peak. X-scale is 0.1ms.How to synchronise Z80 /MREQ pin (with what I need to synchronise it)?
    zxuser zxuser June 2015 Hardware
  • TV Pal, odd and even framesI have been researching, but haven't found any real interesting information on this subject, so far. What I mean is, since TV PAL signal is interl…

    ... to the fact that my oscilloscope didn't trigger line #1 ...
    RMartins RMartins August 2015 Development
  • ZX Spectrum+ adviceHey all, I just got a ZX Spectrum+ from eBay and I'm not sure yet what to do with it. I wanted to first take a peek inside, see what issue board it i…

    ... composite video signal is an oscilloscope.

    A TV / monitor ...
    1024MAK 1024MAK August 2015 Hardware
  • ZX Spectrum+ adviceHey all, I just got a ZX Spectrum+ from eBay and I'm not sure yet what to do with it. I wanted to first take a peek inside, see what issue board it i…

    ... composite video signal is an oscilloscope.[/quote]

    I'll ...
    lunarul lunarul August 2015 Hardware
  • Gold Train in PolandWas listening to the radio this morning and the guy was talking about a train that has been found in Poland buried since the end of the war and possi…

    ... hasn't just put an oscilloscope on demo mode and taken ...
    GReW GReW August 2015 Chit chat
  • A tally on the number of successful builds of the Harlequin[SIZE=4][COLOR=Green][U][B]A tally on the number of successful builds of the Harlequin.[/B][/U][/COLOR][/SIZE] Please post your successes below :-) …

    ... I could check with an oscilloscope and post the output for ...
    Wildbillbudgie Wildbillbudgie September 2015 Hardware
  • 48k not startingHi team, I have 2 48k's, one works (Issue 4s), one doesn't (Issue 4a). The non-working one appears to start, but not finish the RAM test. The pape…

    ... you have access to an oscilloscope? I'm assuming you can ...
    balford balford September 2015 Hardware
  • 1-Bit Sound AccuracyI'm hoping someone can give this snapshot a try on a real machine (just press enter to start the music): https://drive.google.com/file/d/0B6XhJJ33xp…

    I could capture some real sound from a real 48K with a studio mic, and oscilloscope waveforms from the mic port, if it would help?
    RobeeeJay RobeeeJay September 2015 Development
  • 1-Bit Sound AccuracyI'm hoping someone can give this snapshot a try on a real machine (just press enter to start the music): https://drive.google.com/file/d/0B6XhJJ33xp…

    ... with a studio mic, and oscilloscope waveforms from the mic port ...
    Fred Fred September 2015 Development
  • I recapped my 128K toastrack, installed stereo kit and detached audio from video, but...Hello fellow forumers! I'm seeking for help: I've finally decided to change all electrolytic capacitors of my 6U (with all Panasonics 105oC)... Af…

    ... you have access to an oscilloscope, it may help to 'scope ...
    balford balford October 2015 Hardware
  • I recapped my 128K toastrack, installed stereo kit and detached audio from video, but...Hello fellow forumers! I'm seeking for help: I've finally decided to change all electrolytic capacitors of my 6U (with all Panasonics 105oC)... Af…

    ... 't have access to an oscilloscope...
    Got it about the ...
    geosiou geosiou October 2015 Hardware
  • I recapped my 128K toastrack, installed stereo kit and detached audio from video, but...Hello fellow forumers! I'm seeking for help: I've finally decided to change all electrolytic capacitors of my 6U (with all Panasonics 105oC)... Af…

    ... the synchron signal using an oscilloscope. Maybe a transistor is died ...
    ingo ingo October 2015 Hardware
  • Spectrum +2 (Grey) troubleshooting helpHi guys, first time poster here, tell me if I'm doing something wrong. I bought a ZX Spectrum 128k +2 a week ago, it was sold in working condition a…

    In that case I would be inclined to mod the resistor that feeds 12V to the scart RGB blanking pin to see if that has any effect. Unless you have access to an oscilloscope?
    guesser guesser December 2015 Hardware
  • Sudden death of ZX Spectrum 48KHello A friend gave me a 48K rubber keyed Spectrum. I brought it home, hooked it up to my little TV and powered it up. I was very happy to see t…

    ... can test voltages. Alas no oscilloscope. I took the Spectrum apart ...
    memrah memrah December 2015 Hardware
  • Sudden death of ZX Spectrum 48KHello A friend gave me a 48K rubber keyed Spectrum. I brought it home, hooked it up to my little TV and powered it up. I was very happy to see t…

    ... I don't own an oscilloscope to perform more in-depth ...
    memrah memrah December 2015 Hardware
  • Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…

    ... electronic circuits and using an oscilloscope.

    Greetings Ingo ...
    ingo ingo January 2016 Hardware
  • Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…

    ... electronic circuits and using an oscilloscope.

    Greetings Ingo.[/quote ...
    kenwonders kenwonders January 2016 Hardware
  • Harlequin Rev GI have just got all the bits to build an Harlequin Rev G system and I went for a red solder mask board. I have fitted the 3 surface mount components…

    ... a logic probe or an oscilloscope I would ask you to ...
    1024MAK 1024MAK March 2016 Hardware
  • Introduce yourself[SIZE=3][FONT=Comic Sans MS]This is the thread to stop by & introduce yourself.[/FONT][/SIZE]

    ... RAM chip (IC27) using my oscilloscope :)
    Peter Mulholland Peter Mulholland April 2016 Chit chat
  • 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…

    ... the video waveforms (using my oscilloscope) of a issue 1 board ...
    1024MAK 1024MAK September 2016 Hardware
  • Spectrum +2 (grey): Mod- and operation- related advices needed.Dear Sirs and Ladies, Please welcome a newbie to the “World of Spectrum” (both to the forum and, well, metaphorically). I’ve recently purchased a…

    ... couple of meters and a oscilloscope.

    Highly unlikely the ...
    1024MAK 1024MAK October 2016 Hardware
  • 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 ...
    balford balford January 2017 Hardware
  • ZX Spectrum 48k issuesHi all! A couple of days ago I bought my first 48k Speccy off ebay (I already own a beautiful QL expanded with QubIDE interface and 640k ram). It was…

    ... by the ULA with the oscilloscope I saw these "stops" periods ...
    Trantor Trantor January 2017 Hardware
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