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Search Again :: Adv Search 632 results in 0.001s
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  • Poorly Issue One 16k spectrum diagnosis?Hello, everyone. :smile: I was lucky enough to buy an Issue One 16k rubber key the other week; I didn't know it was an Issue One till I opened it up…

    ... you have access to an oscilloscope it takes almost seconds.
    jimre jimre April 2014 Hardware
  • Why was the Speccy screen displaced?Okay, so maybe this has been discussed before but no idea what search terms to look for. I just watched a YouTube video of someone filiming himself …

    ... someone with a fancy pants oscilloscope with video triggering that can ...
    guesser guesser April 2014 Sinclair Miscellaneous
  • Spectrum Not Responding to Keyboard InputHello, sorry if this thread is not in the correct place, This is my first post and I'm not sure where to post this type of thread. :lol: Anyway, I r…

    ... . a logic probe or an oscilloscope?

    All the causes ... probe or better still, an oscilloscope are better tools for this ...
    1024MAK 1024MAK May 2014 Hardware
  • Spectrum Not Responding to Keyboard InputHello, sorry if this thread is not in the correct place, This is my first post and I'm not sure where to post this type of thread. :lol: Anyway, I r…

    ... . I certainly cannot afford an oscilloscope on my student budget and ...
    CornishManicMiner CornishManicMiner May 2014 Hardware
  • Timex contended memory timings, the TS2068 kludge board and EXROM at $4000 - $7FFFI haven't seen this documented anywhere yet so I thought I'd share my findings. I've been investigating contended memory timings on the Timex Sinclai…

    ... explaining the results of my oscilloscope investigation and my theories about ... version of TS# on an oscilloscope, the regular groups of 16 ...
    rga24 rga24 May 2014 Hardware
  • ZX Spectrum clock signals comparedI haven't searched for this on WoS; it might have been posted before. But I think it's important info, and can't do any harm to repeat or show from a…

    ... 2.
    But the output waveform is garbage.


    bverstee bverstee May 2014 Hardware
  • Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…

    ... /> You said you have a oscilloscope.
    With IC23 fitted, can ...
    1024MAK 1024MAK May 2014 Hardware
  • Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…

    ... />
    Will do the other oscilloscope tests later this weekend.
    Brian Brian May 2014 Hardware
  • Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…

    ... /> You said you have a oscilloscope.
    With IC23 fitted, can ...
    Brian Brian May 2014 Hardware
  • DivMMC Enjoy! and interface 1 on ZX+Hi there, I recently obtained the DivMMC Enjoy! and I noticed that it hangs if I plug it in the Interface 1 thru-port of my ZX Spectrum Plus. Conne…

    ... 48K models with a modern oscilloscope.
    There is a lot ...
    bverstee bverstee May 2014 Hardware
  • New user with a dead 48k issue 2Hello all I've found my way here from watching some excellent youtube videos by Joulesper Coulomb in an attempt to fix a issue 2 rubber key 48k I bo…

    ... have access to a 10MHz oscilloscope but I'm not sure ...
    darylw357 darylw357 May 2014 Hardware
  • Spectrum 128 malfunctioning with DIVMMCI recently got myself a spectrum 128 (toastrack) and a DIVMMC card so I could load games from it. It all works fine until it has warmed up and then t…

    ... without an ESR meter or oscilloscope that might be difficult.
    RobeeeJay RobeeeJay May 2014 Hardware
  • Spectrum 128 malfunctioning with DIVMMCI recently got myself a spectrum 128 (toastrack) and a DIVMMC card so I could load games from it. It all works fine until it has warmed up and then t…

    ... manual. I do have an oscilloscope but I haven't ever ...
    Neosodium Neosodium May 2014 Hardware
  • Spectrum 128 malfunctioning with DIVMMCI recently got myself a spectrum 128 (toastrack) and a DIVMMC card so I could load games from it. It all works fine until it has warmed up and then t…

    ... manual. I do have an oscilloscope but I haven't ever ...
    RobeeeJay RobeeeJay June 2014 Hardware
  • ZX Spectrum Clock Signal Restorer Circuit[SIZE=5][U][B]ZX Spectrum Clock Signal Restorer Circuit[/B][/U][/SIZE] The circuit below is an experimental circuit. It has only been "tested" using…

    ... overdrive and therefore "clip" the waveform.

    I had ... problems: a change of waveform shape and a delayed signal ... If you look at the waveform picture that I posted, you ... matter.

    In the waveform diagram:
    Green = simulated poor ...
    1024MAK 1024MAK June 2014 Hardware
  • ZX Spectrum Clock Signal Restorer Circuit[SIZE=5][U][B]ZX Spectrum Clock Signal Restorer Circuit[/B][/U][/SIZE] The circuit below is an experimental circuit. It has only been "tested" using…

    ... that looks like a triangle waveform and signals that are outside ...
    1024MAK 1024MAK June 2014 Hardware
  • Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…

    Most likely another lower RAM IC is bad. It'll be hard to tell which without an oscilloscope, although if you can post a picture of the display here, we might be able to make an educated guess if there's a visible pattern.

    B
    balford balford June 2014 Hardware
  • Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…

    ... to tell which without an oscilloscope, although if you can post ... ]

    I have an oscilloscope.
    Brian Brian June 2014 Hardware
  • ZX Spectrum Clock Signal Restorer Circuit[SIZE=5][U][B]ZX Spectrum Clock Signal Restorer Circuit[/B][/U][/SIZE] The circuit below is an experimental circuit. It has only been "tested" using…

    ... , keep in mind that this waveform image:

    [IMG]https ... (clock_in) {green coloured}[/B][/COLOR] waveform is just an approximation of ... create an even better output waveform.

    Of course, I ...
    1024MAK 1024MAK June 2014 Hardware
  • Spectrum Sound Effects in Star Trek IV: The Voyage HomeRecently, I was watching Star Trek IV: The Voyage Home and there was a scene where it sounded as if a Speccy sound effect was being used very subtly …

    ... are going with the ole waveform analysis, however the amplitude at ...
    sj_howlett sj_howlett June 2014 Sinclair Miscellaneous
  • Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…

    Checked upper ram with an oscilloscope and can not find any ...
    Brian Brian June 2014 Hardware
  • New user with a dead 48k issue 2Hello all I've found my way here from watching some excellent youtube videos by Joulesper Coulomb in an attempt to fix a issue 2 rubber key 48k I bo…

    ... values as I'm an oscilloscope novice :)

    [B]Pin ...
    darylw357 darylw357 July 2014 Hardware
  • +2A: issue 1 no sound but better picture than issue 4?Hello everyone. I have a slight problem here and I am trying to figure out what could be wrong. :-( I have two spectrum +2A with two board revision…

    ... really need access to an oscilloscope to check that the oscillator ...
    guesser guesser August 2014 Hardware
  • +2A: issue 1 no sound but better picture than issue 4?Hello everyone. I have a slight problem here and I am trying to figure out what could be wrong. :-( I have two spectrum +2A with two board revision…

    ... really need access to an oscilloscope to check that the oscillator ...
    Renegade Renegade August 2014 Hardware
  • The ULA6C001E-5...Hi everybody, I have been continuing my Quest for the Holy ULA, and have today taken delivery of a ULA6C001E-5. Now, the -6 was used in Issue 3 boar…

    ... or chrominance signal on an oscilloscope and tune it for zero ...
    rga24 rga24 August 2014 Hardware
  • Spectrum & ZX81 PSU Strange VoltagesHi all I've just refurbished my ZX spectrum PSU after i accidently broke one of the wires i soldered the joints to the PCB nicely and all seems to b…

    ... unit is actually a mixed waveform. It is DC, but with ... that you get with any waveform. Its value is equivalent to ... (the maximum voltage that the waveform gets to).

    Cheap ... on the assumption that the waveform is a sine wave. But ...
    1024MAK 1024MAK August 2014 Hardware
  • anteater - new beeper engineJust letting y'all know about a little project I did yesterday, called "Write a beeper engine in 1 day". [url=irrlichtproject.de/downloads/anteater.…

    ... ]rawp[/B] (aka reasonable accurate waveform player)

    Features:
    utz utz September 2014 Brand new software
  • Faulty 48+ Help NeededHi, This is what I get when I plug in the spectrum, this is tuned in. Vid shows a reset. Any ideas, or pointers on the first thing to check. Keyboa…

    ... line, seenable only on an oscilloscope, not measurable by usual voltmeter ...
    HZJ HZJ September 2014 Hardware
  • Video fault on issue two ZX boardI've trawled the Internet and drawn a few blanks as to where to look to resolve the fault with my issue two board. I'm hoping a few of you knowledgea…

    Do you have an oscilloscope, or access to one?

    [I][B]Mark[/B][/I]
    1024MAK 1024MAK September 2014 Hardware
  • Video fault on issue two ZX boardI've trawled the Internet and drawn a few blanks as to where to look to resolve the fault with my issue two board. I'm hoping a few of you knowledgea…

    [QUOTE=1024MAK;790253]Do you have an oscilloscope, or access to one?

    [I][B]Mark[/B][/I][/QUOTE]

    I don't unfortunately. :(
    Wiggs Wiggs September 2014 Hardware
<1…13141516171819…22>

Latest Posts

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    moggy on 9:07PM
  • Happy 40th Birthday to the Amstrad CPC464!
    AndyC on 6:29PM
  • Another Birthday! The Game Boy Is 35!
    dm_boozefreek on 6:17PM
  • I am currently watching.....
    Antiriad2097 on 5:05PM
  • European Software Titles with an English version
    harriusherbartio on 12:06PM
  • How Do You Categorize Your Speccy Software and Games?
    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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