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  • Issues with Spectrum 48K on SCART input of LCD displaysHi *! I'm new to the forums, but not new to ZX Spectrum. I have bought a ZX Spectrum 48K in 1983 and own it since. It was stored some 20+ years on…

    ... way than replacing capacitors or voltage regulator, I will try. But ...
    Kolli Kolli March 2017 Hardware
  • +2 grey - datacorder on/off switch?Hi everyone. Building a simple on/off switch to power up/down the tape deck will eliminate the noise in sound output? Is this a safe approach or …

    ... the heat generated by the voltage regulator)?
    Renegade Renegade April 2017 Hardware
  • 128K Toastrack (Noisy video output)Hello there guys! Need all of yours guides and advices. Some time ago I bought a nice looking 128K from eBay (motherboard v6K) and put it aside for…

    ... with a new ones, 7805 voltage regulator, TR4 and TR5 transistors ...
    PheeL PheeL 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…

    ... incoming sound be interpreted as voltage? Does it depend on frequency ... happen if I simply deliver voltage instead of sound to EAR ...
    tstih tstih April 2017 Development
  • Frying a 48K ZX Spectrum (revision 4A) with 10 V instead of 5 VHello I got a used zx spectrum. When I opened it up, there was no 5 V positive voltage regulator at the 10 V power inlet. Instead what would be in…

    ... was no 5 V positive voltage regulator at the 10 V ... this doesn't step the voltage down from 10 V to ...
    Boojakascha Boojakascha April 2017 Hardware
  • The ZX Spectrum as a Business MachineMaybe it is time to treat this"business" side of the Spectrum more seriously . What spurred me int action was the arrival in the post today (from Eb…

    ... today (from Ebay) of an Opus Discovery software product called "Sales ... a half Disc-ZX spectrum Opus Discovery) produced by a company ... (and associated hardware like the Opus Discovery) produced back in the ...
    harriusherbartio harriusherbartio July 2017 Sinclair Miscellaneous
  • Fuse for macOS 1.3.8 ReleasedA new version of Fuse for macOS has been released at the dedicated sourceforge project: https://sourceforge.net/projects/fuse-for-macosx/ Note …

    ... /> [*] Also include Eject options for Opus and Didaktik disk interfaces (thanks ...
    Fred Fred August 2017 Emulators
  • 48k Issue 6a Very sick indeed.Hi Guys. I have a 48k Issue 6a board that shows a white screen with grey border. The white screen has three black squares spaced equally on the le…

    ... are way off. If the voltage regulator, capacitors, and TR4 and ...
    RSwipeCA RSwipeCA October 2017 Hardware
  • No Keyboard after recap - ZX Spectrum 48kGuys I am desperate. I did a recap of the ZX 48k board and now the keyboard is not responding to any keypress :-(. I paid attention to the capacitors…

    ... sometimes a capacitor with higher voltage than the original (should not ...
    repetto74 repetto74 October 2017 Hardware
  • Spectrum 128 toastrack imageHi, I have two spectrum 128k toastrack with problems on composite TV out. I have composite mod for both of them, but the image is really bad on bot…

    ... have done:

    - TEA2000 voltage check and it is steady ...
    payty payty November 2017 Hardware
  • multiface basic loaderdoes anyone know how I can see whats in the basic loader of the multiface 1 and 128 basic loaders and how I could convert a tape save from the 1 and…

    does anyone know how I can see whats in the basic loader of the multiface 1 and 128 basic loaders
    and how I could convert a tape save from the 1 and 128 to work with a floppy system like opus discovery?
    caver99 caver99 December 2017 Sinclair Basic
  • Character wobbleHello, I have an Issue 2 board which shows vertical character wobble. This happens for a few minutes followed by a few minutes of character sta…

    ... a possibility that the excess voltage may have
    damaged the ... 're pretty robust and the voltage
    wasn't that much ...
    roganjosh roganjosh December 2017 Hardware
  • opusnot sure if this is the right place for this but I have been trying for copy from 178k floppys to 800k floppys and not having much success does anyon…

    not sure if this is the right place for this but I have been trying for copy from 178k floppys to 800k floppys and not having much success does anyone know if there is any software out there to do file copy to ram disk or direct between floppy sizes?
    caver99 caver99 December 2017 Software
  • New colour palette for Spectrum emulators, 16K/48K/+ machinesI’ve made a colour palette for 16K/48K/+ machines, based on the YUV voltage tables in Chris Smith’s book The ZX Spectrum ULA. This colour palette …

    ... /+ machines, based on the YUV voltage tables in Chris Smith’s ...
    rga24 rga24 February 2018 Updates
  • New colour palette for 16K/48K/+ machines, based on ULA YUV voltagesI’ve made a colour palette for 16K/48K/+ machines, based on the YUV voltage tables in Chris Smith’s book The ZX Spectrum ULA. This colour palette …

    ... /+ machines, based on the YUV voltage tables in Chris Smith’s ...
    rga24 rga24 February 2018 Emulators
  • 128K +3 RepairHi guys, I need some help to diagnose a faulty 128k +3. The unit is completely unresponsive. I had tested the PSU and found odd values in it. …

    ... pins are reporting the correct voltage.

    I need some ...
    amateus amateus March 2018 Hardware
  • Parallel to serial z80 i/o portI have an Opus Discovery and an Alphacom 32 printer. I want to see if I can make a cable that will use the Opus Parallel printer port. The question i…

    I have an Opus Discovery and an ... cable that will use the Opus Parallel printer port. The ... Alphacom 32 pins to the Opus printer port pins...
    ... pages from both the Opus manual and the Alphacom ... I see available on the Opus (unless these reference bits ...
    hedge hedge April 2018 Hardware
  • Loading games from pcI have set up an issue 6a with an opus discovery 1 The opus has had the upgrade from bytedelight of twin floppys and quickdos and is working great. …

    ... 6a with an opus discovery 1
    The opus has had the ... doesn't work with the opus at moment or I would ...
    caver99 caver99 May 2018 Hardware
  • Horizontal black and white bars on ZX Spectrum 128k ToastrackSo I found a working 128k toastrack on a local auction site. After playing around with it for a few days I noticed the sound of the AY chip was reall…

    ... .

    I checked the voltage regulater and it puts out ...
    StarQuake StarQuake May 2018 Hardware
  • ZX Spectrum 128k Toastrack with horizontal black and white barsSo I found a working 128k toastrack on a local auction site. After playing around with it for a few days I noticed the sound of the AY chip was reall…

    ... .

    I checked the voltage regulater and it puts out ...
    StarQuake StarQuake May 2018 Updates
  • 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 …

    ... signals is not correct (the voltage between sync and black is ... interested in knowing the typical voltage of the composite video signal ...
    paf paf November 2018 Hardware
  • LM317T modern replacementQuick question to everyone, I am back to modding my opus discovery 1 and looking at the LM371T regulators and wondering if there is a modern equival…

    ... am back to modding my opus discovery 1 and looking at ...
    caver99 caver99 January 2019 Hardware
  • problem with symbol shift and caps shift key combinations on multilayer keyboard membranesHello, I know, it is generally know that some ZX Spectrums with multilayer keyboard membranes have problems with some key combinations. Typically …

    ... just a little and maybe voltage is not reaching needed level ...
    cygnus cygnus January 2019 Assembler
  • MIA Quick-Copy v2.48 by Lilywhite Software (Germany) Helge Keller can be downloaded hereMIA Quick-Copy v2.48 by Lilywhite Software (Germany) Helge Keller For the Opus Discovery. It can format and copy discs, even from other systems (+D,…

    ... ) Helge Keller
    For the Opus Discovery. It can format and ... .OPD-File. Diskimage done with Opus on Gotek Drive).
    Luzie Luzie September 2019 MIA/STP/SDP
  • Video: Fixing Bad Video Quality on ZX SpectrumIt's pretty common for the classic ZX Spectrum and ZX Spectrum+ to have pretty bad image quality. Most of the time it's not just the RF that is to bl…

    ... some more about how the voltage-generation circuit works on the ...
    llopis llopis February 2020 Hardware
  • 12V missing on an issue 3I’ve been working on an issue 3 Spectrum +. It shows thin distorted vertical stripes on bootup. +5 and -5V are all right but the 12V line measures ro…

    ... also not showing a proper voltage. Can a failing LM1889 pull ... the voltage down? Or should I look ...
    protek protek July 2020 Hardware
  • zx spectrum +2 cpu questionanother +2 mystery ... so just testing a +2 Z70700 issue 1.. although my power set up was a bit delboy .. PS2 power brick with modified end for the …

    ... feed via its stand by voltage.. so tested the +2 with ...
    mark8bit mark8bit August 2020 Hardware
  • Spectrum in a BoxI had a Spectrum+ sitting around for quite some time collecting dust. The case wasn't much to look at, and the keyboard was already missing two keys.…

    ... antenna socket
    - original 5V voltage regulator replaced with Traco TSR ...
    xelalex xelalex August 2020 Hardware
  • zx spectrum +2A power supply missing -12v voltshey.. i'm looing at a zx spectrum +2A power supply that the -12v rail seems to be missing .. it has the 12 volts and 5 volts .. it is the version wit…

    ... that there is no input voltage .. any suggestions / power supply info ...
    mark8bit mark8bit November 2020 Hardware
  • Quirky nerdy hardware quiz time[b]Quirky nerdy hardware quiz time[/b] [list=1][*]How many transistors are on the issue one ZX Spectrum PCB? [color=#FFFFFF].[/color] [*]Which d…

    ... tell me the normal forward voltage of a blue one.
    1024MAK 1024MAK December 2020 Sinclair Miscellaneous
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