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Search Again :: Adv Search 1000 results in 0.073s
<1234567…34>
  • Some kid pedalled past my window in C5 todayWhile teaching in an ICT room, a pupil 'drove' past piloting a bona fide Sinclair C5. I couldn't leave to go after him, and find out the reason or st…

    While teaching in an ICT room, a pupil ' ... piloting a bona fide Sinclair C5. I couldn't leave to ... out he'd brought it in for something to do with ...
    MattLamb MattLamb March 2014 Chit chat
  • Two-resistor fix for +3 sound distortionOver at Zonadepruebas, mcleod_ideafix has done a circuit analysis of our favorite distorted sound output: the issue 1 +3 AY chip sound output, and fr…

    ... I needed to change four resistors. In this new version, we ... need to use two resistors. If the change is ... made with SMD resistors, the change will be ... out for the two resistors that are needed: 33K ...
    Here are the two resistors we need, compared with a ...
    Winston Winston December 2010 Hardware
  • 16K/48K Lower RAM (4116) replacement.You may want to read [URL="http://www.worldofspectrum.org/forums/showthread.php?t=37957"]this thread[/URL] for background information on the quest t…

    ... lower RAM address lines. In particular, in some cases a logic ... models also have higher value resistors in series with the address lines ... /> It can simply be plugged in in place of the 4116s.
    in component testing/experimentation and ...
    Zorn Zorn May 2013 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…

    ... to give me the socket in the right place. Initially I ... also replaced a couple of resistors in the video circuitry, again as ... all adjusters at one point in frustration!

    As far ... />
    Thank you so much in advance.
    Wiggs Wiggs September 2014 Hardware
  • ZX Spectrum+ video ? red on green problemThis is my first post on the forum, so let me introduce myself. I am retired for several years. For 30 years I have been a fan of the ZX Spectrum. I …

    ... letters are displayed when written in red ink on green paper ... frequency. I checked all the resistors in the analog part of the ... circuit points. All voltages are in line with service manual.
    Boleslaw Jamroz Boleslaw Jamroz January 2015 Hardware
  • +2 Grey versionsThis thread is an attempt to pin down the various hardware revisions of the +2 Grey. If anybody can provide further images from their machines or fur…

    ... appear to have been manufactured in Taiwan, this is embossed on ... rear of the PCB in the traces, in this case 32nd Week ... with radial capacitors, 2 bodge resistors and a capacitor on the ... change, different diodes, changes to resistors in bottom left corner of the ...
    smogit smogit September 2015 Hardware
  • Nasty vertical pattern on a 128K Toast Rack via RGBI managed to fix the busted membrane on my [url="https://www.worldofspectrum.org/forums/discussion/55755/got-myself-a-128k-toast-rack-plus-a-simple-a…

    ... a strange, wavy vertical pattern in the display bitmap area, ... signal delay, which results in yellow/blue vertical lines around ... around with the values of resistors in all possible combinations—no effect ... (I think). For example, in 48K BASIC, the pattern will ...
    Ast_A_Moore Ast_A_Moore January 2018 Hardware
  • +3 soundhello there, just a quick-fire question today. i'm kinda keen on the idea of using my +3 quite a bit, particularly if i bother to to actually sort …

    ... just never built a circuitboard in my life before! tis kinda ... than swapping a couple of resistors!)
    .[/QUOTE]

    Its ... easy, easier than swapping some resistors in most cases. :)

    Grab ...
    KeepGood KeepGood June 2006 Hardware
  • +3 soundhello there, just a quick-fire question today. i'm kinda keen on the idea of using my +3 quite a bit, particularly if i bother to to actually sort …

    ... easy, easier than swapping some resistors in most cases. :)

    Grab ...
    Hungry Horace Hungry Horace July 2006 Hardware
  • speccy +2 rgb socket driving me crazy!until today I was using RGB pins 1 and 2 for composite out. Tonight I suddenly get mad and decided to build a proper RGB Scart cable. Having read P…

    ... (for example 2 1K resistors in series from the 5v to ... the junction of the two resistors) so long as pin 16 ... at the junction of the resistors fall. You can use smaller ...
    Winston Winston February 2007 Hardware
  • Low Sound output + Sound distorting pictureHi, I am having a problem with my Grey +2 at the moment while trying to use RGB output. When I load a game the loader tones are fine but the actual…

    ... do not have the 3 resistors in line either, which just seems ... sound only:-?

    Thanks in advance,

    Simon
    +2MAN +2MAN June 2007 Hardware
  • Low Sound output + Sound distorting pictureHi, I am having a problem with my Grey +2 at the moment while trying to use RGB output. When I load a game the loader tones are fine but the actual…

    ... , I have no diodes or resistors in the RGB cable, I am ... due to not putting the resistors in. The slight fussing around the ...
    +2MAN +2MAN June 2007 Hardware
  • +3 RGB to SCART cableToday i decided to make a cable of this sort by myself. I found the schematics here [url]http://falvarezold.dyndns.org/videojuegos/doc/cable_rgb_euro…

    ... RGB lead from the guy in Poland for my grey ... i bought from the guy in Poland, after i cut ... told me, it worked in the 128 heatsink BUT not ... there were some diodes and resistors in the scart connector, he ... scart connector (the one in the middle of those bridged ...
    gtsamour gtsamour August 2007 Hardware
  • Speccy plus composite modHi folks, I have 2 48K speccy plus machines both with really poor RF output, one is very weak and the other wanders and white tears across the scree…

    ... know i can use 2 resistors in line that add up to ...
    gtsamour gtsamour December 2007 Hardware
  • Speccy plus composite modHi folks, I have 2 48K speccy plus machines both with really poor RF output, one is very weak and the other wanders and white tears across the scree…

    Put two 150 Ohm resistors in parallel give you 75 Ohm...
    But 82 Ohm is OK...
    This circuitry don't amplify but lower output inpedance to 75 Ohm
    Gods Gods December 2007 Hardware
  • Speccy plus composite modHi folks, I have 2 48K speccy plus machines both with really poor RF output, one is very weak and the other wanders and white tears across the scree…

    ... ;231996]Put two 150 Ohm resistors in parallel give you 75 Ohm ...
    gtsamour gtsamour December 2007 Hardware
  • +3 scart cablejust bought a +3 scart cable and when i get everything up on the screen it`s like if its a negative picture. I cant be arsed to send it back if i can…

    ... following instructions that had 68R resistors in each cable.
    [url]http ... .html[/url]
    Removing the resistors completely fixed the problem.
    gtsamour gtsamour March 2008 Hardware
  • +3 Audio hates me with a passionHihi Since nobody seemed to have a spare +3B board, I've been trying to replace the audio entirely, aiming for a speaker inside the machine Since p…

    ... the type of bias used in the original +3A.
    [url ... , and try a 100R - 470R in place of R72.

    in parallel equals 757.85 ohms ... /> Reports of 75 and 220R resistors in parallel with 2.2k R72 ...
    FrankT FrankT June 2008 Hardware
  • Someone can help me to fix my Zx Spectrum?I did a video about the startup: [url]http://dl.dropbox.com/u/1566495/ZXSPECTRUM03.mp4[/url] I have replaced the ULA with a working one (same proble…

    ... /> Better option: there's 2 resistors in the upper 32K control logic ... of those? (1 side up in the air does the trick ...
    RetroTechie RetroTechie March 2010 Hardware
  • Help me understand ZX RGB signal (long)This will be a long post so please bear with me and most importantly help me. I have a 128K+ and +2A that I'm trying to get working with my 15kHz RG…

    ... , with a 75 Ohm load in the receiving device. Same for ... have the sync signal mixed in, which are negative-going pulses ... by including ~100 Ohm series resistors in the cable, so you get ...
    RetroTechie RetroTechie September 2010 Hardware
  • 128 port hardware patchReading the ULA book has reminded me of something. In The Spectrum Hardware Manual (Adrian Dickens) there is a hardware patch to allow free use of al…

    ... />
    And with all the resistors in there, to do it the ...
    Winston Winston September 2010 Hardware
  • Spectrum +3 and DivIDE+I have won a +3 on ebay. When it arrives, I know that I can use my DivIDE+ with it, but I have read about the +3E ROMs. I mostly use Spectrums to pla…

    ... just changed all the relevant resistors in my +3 to match the ...
    guesser guesser October 2010 Hardware
  • Genesis: dawn of a new day, new game from RetroWorks!It's been a long development, but finally we made it. We proudly present the latest game from RetroWorks, Genesis: dawn of a new day. [img]http://ww…

    ... it's hardware fix. In interrupt time read CPU from ... vector value. Pull-up resistors in ZX spectrum set value # ... M1 and IORQ are both in low level (active) ... and K-MOUSE send via resistors to data bus value ... #FF (via resistors only = better pull-up ...
    velesoft velesoft November 2010 Games
  • +2 grey composite modWithout digging out the schematics, is it possible to do the composite mod like the 48k on these?

    ... they require 300-330 ohm resistors in series, as you can see ...
    TMX TMX March 2011 Hardware
  • Hacking a Joystick InterfaceI have a DK'Tronics twin-port joystick interface that does Kempston and Sinclair 0-6 keys. I know it has only 14 lines connecting it to the edge con…

    ... against each other. So Velesofts resistors in the data lines are more ...
    roko roko April 2011 Hardware
  • NEW KEMPSTON interface for ZXHi. Lotharek has released a new KEMPSTON interface for people who doesn't need AY on-board and want to have some really small device. [url]http:/…

    ... QUOTE=velesoft;554986]Without this resistors can be interface unstable.[/QUOTE ... but... couldn't be those resistors in the solder side? Or... would ... GAL used has not built-in pullups so you're ... did include the necessary pullup resistors in the KempAY interface.
    mcleod_ideafix mcleod_ideafix August 2011 Hardware
  • Scart problemsHi all I've just received a +2a off ebay and a scart from coolnovelties.Now when i use scart i seem to get ghosting on one telly and the one downstai…

    ... ), once I tweaked a resistor in the spectrum side I could ... the cables should have the resistors in otherwise they would not work ...
    smogit smogit May 2012 Hardware
  • Ferguson MA20 via SCART to modern TVHello, I am a newbie here but I visit this forum on regular basis to find interesting informations about computers of my life - Speccies. I have a s…

    ... ). You will have to put resistors in your cable.

    You ... power supplies. Indeed, I put in my article that you can ...
    Jose_Leandro Jose_Leandro 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…

    ... any 3W (or greater) power resistors in the 20 ohm to 47 ... ]PS I added some links in my earlier post[B].
    1024MAK 1024MAK August 2012 Hardware
  • WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…

    I'd definitely be interested in one once they're done ( ... while before there's much in the way of docco and ... the "proper level switching" solution in the form of a bunch ... most part, however I use resistors in a couple of places too ...
    JeffB JeffB August 2012 Hardware
<1234567…34>

Latest Posts

  • I am currently watching.....
    Paradigm Shifter on 12:49AM
  • New video about S-video modification on Issue two 48K Spectrum.
    Renegade on April 21
  • Fixed Speccy Software. And which games remained unfixed?
    John Elliott on April 21
  • Happy 40th Birthday to the Amstrad CPC464!
    rich_chandler on April 21
  • Another Birthday! The Game Boy Is 35!
    mel the bell on April 21
  • European Software Titles with an English version
    harriusherbartio on April 21
  • Elusive Strategy Games done by the Smaller or less Prolific Software Houses.
    harriusherbartio on April 21
  • 1992 Spectrum Software
    harriusherbartio on April 21
  • +3 Disk drive motor
    AndyC on April 21
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    mel the bell on April 20

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