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<1…17181920212223…34>
  • Dead 128K heatsinkUnfortunately my 128K heatsink died suddenly and with no apparent reason. I had the Kempston Pro interface connected and when i powered it on the ztx…

    Check for just boring old short circuits. Find a circuit diagram for the 128K+ and trace everything that works of 12V on the PCB, looking for bits of swarf, metal, loose screws, solder splatter and possibly other failed components.
    Winston Winston November 2011 Hardware
  • Dead 128K heatsinkUnfortunately my 128K heatsink died suddenly and with no apparent reason. I had the Kempston Pro interface connected and when i powered it on the ztx…

    ... service manual:

    Symptom: Short persists with tr4 removed
    2. Check that TR5 circuit components are to latest specification ...
    gtsamour gtsamour November 2011 Hardware
  • Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…

    ... cache SRAMs usually have very short access time (=good) but also ... fast switching outputs (short rise / fall times), which is ... 't for my 4116 replacement circuit.

    [QUOTE]I also ...
    RetroTechie RetroTechie December 2011 Hardware
  • I am currently playing......Don't know if there's been a thread like this, but I can't find one.... Having seen all the different threads asking people if they've played such a…

    ... number one on the grass circuit, but I think that's ... blast! It might be a short ride, but what a rip ...
    GreenCard GreenCard February 2012 Chit chat
  • Issue 4S users... I need your help!Short story: Issue 4S spectrum don't work. TR4 seems to have pins at different places from other speccys (BCE versus EBC), and usual replacement part…

    ... the video circuit attached). After that I searched for short circuits between ...
    Zup Zup March 2012 Hardware
  • SpecEmu 3.0Has anyone else noticed that Woody's released a version 3.0 of SpecEmu? Nope? Just me then... :D

    ... ' just arises spontaneously with every SpecEmu build. It's a kinda ... pulled the file again a short time ago.
    Woody Woody March 2012 Emulators
  • 4116 SRAM replacement (and ULA timings).As mentioned in another thread, I have spent quite a lot of time experimenting with different circuits and components for using a static RAM IC to re…

    ... ] problem might be the very short delay between (/RAS going low ... in place of the transistor circuit above. This is a surface ... this form, this SRAM replacement circuit has worked in all Spectrums ... guessing, but I suspect my circuit would work best with:
    RetroTechie RetroTechie March 2012 Hardware
  • 4116 SRAM replacement (and ULA timings).As mentioned in another thread, I have spent quite a lot of time experimenting with different circuits and components for using a static RAM IC to re…

    ... ] problem might be the very short delay between (/RAS going low ... /> Have you tried that exact circuit with a 5C ULA?
    circuit with 74LVC1G inverter with a ... . For example, the transistor inverter circuit works perfectly in an issue ...
    Zorn Zorn March 2012 Hardware
  • Need license to use music equipment nowAll my upcoming gigs that are in/on council property now require that I pay to get a license to use my equipment. Otherwise I can't perform. :( To …

    ... of guys on the pub circuit around these parts have "normal ... " day jobs. The pub circuit around London is, on the ... their sets down to crazy-short levels in order to allow ...
    ccowley ccowley March 2012 Chit chat
  • Power adaptor for a Sinclair 128kHi, just a quick question. Would a 48k spectrum+ power lead work for a 128k Sinclair Speccy, I have both but the power does not work on the 128k, I n…

    ... amps, or tap into the circuit somewhere.

    Worst case ... to fail.

    For short term tests, i admit to ...
    Asure Asure March 2012 Hardware
  • Bad Reset Line on +3eHello there my fellow WoS'ers, Alas I have not been about much over the last couple of weeks, got hit by the flu, headcold and a rather nasty throa…

    ... we've discussed the reset circuit on the +3 before, it ... to try would be to short our R4 so that the ...
    guesser guesser April 2012 Hardware
  • ULAPlus: showing different screen modes in one screenI wanted to write a demo showing the same screen, converted to various screen modes available on the Spectrum (well, a Spectrum clone capable of show…

    ... tried the file with SpecEmu and yes, I noticed ... need such OUT. Anyway, Specemu would need to be updated ... them but not in Specemu. Then I added them ... screen modes and suddently, Specemu started to work well... ... to be displayed) a little short (4 T-states), the ...
    mcleod_ideafix mcleod_ideafix May 2012 Development
  • JSpeccy v0.90Hi4all, A new JSpeccy version has been released at my project webpage. This new release have many corrections, some optimizations and a few new feat…

    ... me on both JSpeccy and SpecEmu, it may be down to ... : true multiplatform. And I'm short of keys. I need two ...
    zx81 zx81 May 2012 Emulators
  • ULA TEST 3 results on real hardwareHi guys, I'm writing small spectrum emulator and I wanna implement precise emulation for different spectrum models :-) I found nice test for conten…

    After a short use, things look even better. :)< ... better (or polished), similar to SpecEmu or JSpec, but its possible ...
    Pegaz Pegaz May 2012 Emulators
  • PZX on WOS ?Is the PZX format accepted on WOS, at least for new production ? (Sorry, if this is wrong section, it looks to me as most suitable for the question.)

    ... . To make it short Spectaculator (just like Spin and SpecEmu) emulates some ...
    Ralf Ralf May 2012 MIA/STP/SDP
  • What's going on during a reset?Always wanted to know this. Why does the screen fill with garbage then white lines on black then just a totally black screen? What is happening?

    ... to 5 Volt.
    This circuit ensures that the the reset ... held logically low for a short period of time during power ...
    Knik Knik May 2012 Hardware
  • What's going on during a reset?Always wanted to know this. Why does the screen fill with garbage then white lines on black then just a totally black screen? What is happening?

    ... to 5 Volt.
    This circuit ensures that the the reset ... held logically low for a short period of time during power ...
    Johan1973 Johan1973 May 2012 Hardware
  • Replacing coil with other component?The purpose of the coil transformer, from what I gather in the schematics of the issue 2 spectrum, is to create 5V from about 9-10V. Would it not be …

    TR4 getting blown might also indicate something is drawing too much current external to the power supply circuit (faulty 4116 RAM perhaps, or a short somewhere?)
    Winston Winston June 2012 Hardware
  • Replacing coil with other component?The purpose of the coil transformer, from what I gather in the schematics of the issue 2 spectrum, is to create 5V from about 9-10V. Would it not be …

    ... power supply circuit (faulty 4116 RAM perhaps, or a short somewhere?)[/QUOTE ... transistors in the DC-DC circuit, and will probably keep on ...
    Johan1973 Johan1973 June 2012 Hardware
  • 48k+ CPU SocketThink I've bitten off more than I can chew... After the desoldering my z80 went without incident, no damaged pads, tracks etc. I expected the socket…

    ... sure there is not a short unless there should be according ... practising first on an old circuit board (I keep broken electronics ...
    Johan1973 Johan1973 June 2012 Hardware
  • No video in Spectrum 128k +2A Grey[B][COLOR="red"]EDIT: 26-05-2012 = Thread topic edited[/COLOR][/B] Hi everyone, Recently i won a Spectrum 128k +2A Grey at ebay UK. The Spectrum …

    I would examine the circuit board looking for short circuits on address and data lines next.
    guesser guesser June 2012 Hardware
  • Spectrum +3 FavourCan a kind soul with a multimeter and a +3 measure the resistance on the power socket between the 5V and the ground? I have a dead +3 that only has 0…

    ... =Womble;632680]Am suspecting an short somewhere on the board, or ... when gone, prevents the regulation circuit to operate and thus, prevent ...
    mcleod_ideafix mcleod_ideafix June 2012 Hardware
  • Issue 2 Failed 48k to 128k upgradeI have been trying to upgrade my Issue 2 with the help of Velesoft, using this schematic; [IMG]http://i764.photobucket.com/albums/xx284/arioch1973/4…

    ... ; trace on bottom of the circuit board has been damaged, and ... 2 things: 1) damaged circuit board / traces / short circuits due to a ... to hell'. Found a cracked circuit trace, fixed it, but no ... . Found [I]another[/I] cracked circuit trace, fixed it, again no ...
    RetroTechie RetroTechie August 2012 Hardware
  • Getting an 14Mhz crystal to oscillate?I am building a circuit with an 74LS32 and a 74LS193 to work as frequency divider. Though I have hit a snag, how to I wire up a crystal to make it os…

    ... a 14 MHz crystal oscillator circuit.

    Perhaps it's ... wiring from/to Xtal pins short.
    RetroTechie RetroTechie August 2012 Hardware
  • SPECTRA New from Paul FarrowLooks good! Read about it [URL="http://www.fruitcake.plus.com/Sinclair/Spectrum/Spectra/SpectraInterface.htm"]here[/URL]

    ... point of view of the circuit designer):

    1. Use ... a PLL circuit to regenerate the 3.5MHz ... . For 128K users, provide a short cable from the RGB outputs ...
    Winston Winston October 2012 Sinclair Miscellaneous
  • SPECTRA New from Paul FarrowLooks good! Read about it [URL="http://www.fruitcake.plus.com/Sinclair/Spectrum/Spectra/SpectraInterface.htm"]here[/URL]

    ... point of view of the circuit designer):

    1. Use ... a PLL circuit to regenerate the 3.5MHz ... . For 128K users, provide a short cable from the RGB outputs ...
    BloodBaz BloodBaz October 2012 Sinclair Miscellaneous
  • PLEASE HELP!! DEAD SPECTRUM!!Sad News!!! I have a spectrum issue 5 board and I'd done the general composite mod which was great and it worked with a divIDE plus (RWAP) and esxDO…

    ... then removed the vera board circuit then put the modulator "shell ... video. There must be a short somewhere. I tried removing the ... get hot quickly indicating a short as forementioned in this thread ...
    jayteebee jayteebee October 2012 Hardware
  • PLEASE HELP!! DEAD SPECTRUM!!Sad News!!! I have a spectrum issue 5 board and I'd done the general composite mod which was great and it worked with a divIDE plus (RWAP) and esxDO…

    ... then removed the vera board circuit then put the modulator "shell ... video. There must be a short somewhere. I tried removing the ... get hot quickly indicating a short as forementioned in this thread ...
    MrCheese MrCheese October 2012 Hardware
  • Creating new hardwareThis is slightly off topic, but I hope some of you might be able to help. There is some amazing work on the Sinclair scene, creating new devices and…

    ... for schematics, PCB layout and circuit simulation.
    * You can get ... things that really exist in short supply are not the electronics ...
    Winston Winston October 2012 Hardware
  • Preamp Solution for Speccys?Hi, I was wondering what people were using to amplify their sound card or line level datacorder signal to a loud signal for a speccy. Is anyone usin…

    ... mono cable I made. Simply short the 2 channels into one ... use a stereo cable you short the signal to ground. If ... laptop. I then proceeded to short the transistors out accidentally and ... anyone is interested in that circuit I can post it, but ...
    vext01 vext01 November 2012 Hardware
<1…17181920212223…34>

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