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<1…21222324252627…34>
  • Schematic ErrorThere appears to be an error in the Schematic for the 128k +2A and +3 the error is present in both the redrawn TIF version and the original drawing …

    Ok, here's the +2B schematic. Hopefully correct but I have no way to confirm that, since I don't have one myself.

    [url]http://alistairsserver.no-ip.org/public/spectrum/schematics/+2Bschematic.png[/url]
    guesser guesser October 2010 Hardware
  • Faulty +2A questionDug out some Spectrums earlier and amongst them I had +2A's which i've never even bothered to power up. First one powered up no probs, clean picture …

    ... isn't part of the schematic. It's not fitted to ...
    guesser guesser November 2010 Hardware
  • Schematic ErrorThere appears to be an error in the Schematic for the 128k +2A and +3 the error is present in both the redrawn TIF version and the original drawing …

    The schematic diagram [URL="http://alistairsserver.no- ...
    zxy zxy November 2010 Hardware
  • Schematic ErrorThere appears to be an error in the Schematic for the 128k +2A and +3 the error is present in both the redrawn TIF version and the original drawing …

    [QUOTE=zxy;489967]The schematic diagram [URL]http://alistairsserver.no- ...
    guesser guesser November 2010 Hardware
  • Schematic ErrorThere appears to be an error in the Schematic for the 128k +2A and +3 the error is present in both the redrawn TIF version and the original drawing …

    ... moving things about on the schematic, accidentally dropping a trace where ...
    guesser guesser November 2010 Hardware
  • Schematic ErrorThere appears to be an error in the Schematic for the 128k +2A and +3 the error is present in both the redrawn TIF version and the original drawing …

    ... to go from PCB to schematic? Do you use any special ... software besides a schematic capture program? How do you ...
    mcleod_ideafix mcleod_ideafix November 2010 Hardware
  • Schematic ErrorThere appears to be an error in the Schematic for the 128k +2A and +3 the error is present in both the redrawn TIF version and the original drawing …

    ... any special software besides a schematic capture program? How do you ... , I've not attempted a schematic from scratch yet, so I ... /> first I got the existing schematic in a graphics editor (in ... .

    For the actual schematic software I used gschem on ...
    guesser guesser November 2010 Hardware
  • Z80 Based Laptop[url]http://www.retroleum.co.uk/electronics-articles/previous/the-v4z80p-a-z80-based-laptop/[/url]

    ... in freedom - see GNU EDA (schematic capture, netlister, PCB layout program ...
    Winston Winston November 2010 Hardware
  • Z80 Based Laptop[url]http://www.retroleum.co.uk/electronics-articles/previous/the-v4z80p-a-z80-based-laptop/[/url]

    ... =Winston;490413]see GNU EDA (schematic capture, netlister, PCB layout program ...
    guesser guesser November 2010 Hardware
  • New stereo audio board for fitting on AY chip - interested?Hi, I developed a small board that fits on the AY chip inside 128K ZX Spectrums: [IMG]http://www.benophetinternet.nl/hobby/vanmezelf/stereo_audio.j…

    ... Ingo's version of the schematic.

    I will leave ...
    bverstee bverstee November 2010 Hardware
  • New stereo audio board for fitting on AY chip - interested?Hi, I developed a small board that fits on the AY chip inside 128K ZX Spectrums: [IMG]http://www.benophetinternet.nl/hobby/vanmezelf/stereo_audio.j…

    I have the schematic and board designs ready:
    [ ...
    bverstee bverstee November 2010 Hardware
  • Simple & Portible means to boost PC Soundcard Line Out?Hi Guys, My older computers were very good at driving a real spectrum's ear socket via their Line Out or Headphone socket. My new Dell's sound card…

    I was going to say that not biasing the transistor wouldn't help because then if your signal is
    guesser guesser November 2010 Hardware
  • Simple & Portible means to boost PC Soundcard Line Out?Hi Guys, My older computers were very good at driving a real spectrum's ear socket via their Line Out or Headphone socket. My new Dell's sound card…

    [QUOTE=guesser;492148]I was going to say that not biasing the transistor wouldn't help because then if your signal is
    BloodBaz BloodBaz November 2010 Hardware
  • What Spectrum to choose?Hi i'm new to the Spectrum. I read 'bout it in CDA (Polish game magazine) and watched LGR review of the 48k and it REALLY interested me. What model m…

    ... some time to draw the schematic diagram for this.

    BiNMaN BiNMaN November 2010 Hardware
  • What Spectrum to choose?Hi i'm new to the Spectrum. I read 'bout it in CDA (Polish game magazine) and watched LGR review of the 48k and it REALLY interested me. What model m…

    ... some time to draw the schematic diagram for this.

    Alien 8 Alien 8 December 2010 Hardware
  • Question about ZX81 componentAfter I cleaned and replaced some components (7805, two electrolytic caps) with fresh ones, and replaced the RF board with a composite one, on an iss…

    If this is the crystal marked with X1 on the schematic, then it's using only 2 of the pins.
    However, this seems to be the main oscillator for the ZX81 CPU and ULA.
    Pilsener Pilsener December 2010 Hardware
  • Should this be connected?[IMG][URL=http://img528.imageshack.us/i/img7396m.jpg/][IMG]http://img528.imageshack.us/img528/6470/img7396m.th.jpg[/IMG][/URL] Uploaded with [URL=htt…

    I couldnt tell at the minute as im at work, just had a scout around for a schematic but couldnt find one for the grey or i would have told you. Ill check when i get home
    Macc Macc December 2010 Hardware
  • Can a ZX81 be upgraded to a Spectrum?No, I don't want to do this, and I agree that to do so (even if I could) would be a waste of time. The question is, is it possible though? The upgrad…

    ... easier to take ZX Spectrum schematic & re-do circuit board ...
    RetroTechie RetroTechie December 2010 Hardware
  • ZXC3 Rom CartridgeI recently aquired a ZXC3 Cartridge Rom from [URL="http://www.fruitcake.plus.com/"]Paul Farrow[/URL] fully populated with the latest diagnostic softw…

    ... Rom.
    Paul sent the schematic once to me but due ...
    parz2402 parz2402 December 2010 Hardware
  • Upgrading 16k MemoryHi All I have a fully working issue 2 16k spectrum and a broken issue3 48k spectrum (It's showing the black and white bars and some flashing blocks)…

    ... missing, you can check iss2 schematic + board layout to see what ...
    RetroTechie RetroTechie December 2010 Hardware
  • Issue2 troublesHi! I have a 48k Speccy Issue 2 which has trouble with displaying colour. It did have a broken LM1889 chip (it didn't display the blue component of …

    ... might want to check the schematic for a 3.58 or ...
    RetroTechie RetroTechie January 2011 Hardware
  • Some TAP files not working on DivIDEOne of the people who ordered a DivIDE from me told me het can't load certain TAP files, which load perfectly on emulators. I have encountered that …

    ... RN1 can't be unused. Schematic and board of DIVIDE 57c ... 's only from previous versions. Schematic must be fixed and components ...
    velesoft velesoft January 2011 Hardware
  • DivIDE circuit/logic specsIs the hardware of the DivIDE documented, particularly the contents of the GAL/PAL chips? I'm looking to write a VHDL implementation of it. So far I…

    ... .htm[/URL] (click on the schematic photo)

    [URL="http ... archive.org except for the schematic files) detail a forthcoming 317 ...
    toadstool toadstool January 2011 Hardware
  • 2 48K speccys dead..Hey guys! I've got two of our rubbery friends with me that need some help. They've been like this for some time, but I would like to try and fix th…

    ... keyboard connector. You can check schematic / service manual to see which ...
    RetroTechie RetroTechie February 2011 Hardware
  • Divide+ and joystick interface problemHi! Maybe someone can help me. Any of joystick interfaces which I have doesn't works with Divide+( without joy interfaces works fine.) My joystick in…

    ... /Joy2IC.gif]simple 2 chip schematic on top[/url]

    Zetr0 Zetr0 February 2011 Hardware
  • Divide+ and joystick interface problemHi! Maybe someone can help me. Any of joystick interfaces which I have doesn't works with Divide+( without joy interfaces works fine.) My joystick in…

    ... /Joy2IC.gif]simple 2 chip schematic on top[/url]


    bug1: your schematic use uncomplette (= bad) adressation of ...

    You can redesign schematic and use full 8bit adress ...
    velesoft velesoft February 2011 Hardware
  • Spectrum +2A Unknown ModificationsHello there my fellow ZX'ers recently a good friend of mine gave me a Sinclair +2A Issue 1 - alas it doesn't fully boot - some times it manages to g…

    ... isn't present on the schematic (which appears to be for ...
    guesser guesser February 2011 Hardware
  • Spectrum +2A Unknown ModificationsHello there my fellow ZX'ers recently a good friend of mine gave me a Sinclair +2A Issue 1 - alas it doesn't fully boot - some times it manages to g…

    ... isn't present on the schematic (which appears to be for ...
    guesser guesser February 2011 Hardware
  • Defender LightgunJust fired up the toaster with a Cheetah Lightgun attached, tried a few games off the Defender tape but no matter what I try I cant hit "anything", i…

    ... I agree. Is there a schematic and tutorial somewhere so that ...
    zxbruno zxbruno March 2011 Sinclair Miscellaneous
  • zx 48K PSU and C116It seems that ZX 48K and Commodore C116 have identical power supply, 9V 1A, DC, minus in centre. Can someone confirm it?

    ... -1.gif]here is a schematic of its connectors (including power ...
    Zetr0 Zetr0 March 2011 Hardware
<1…21222324252627…34>

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    John Elliott on April 21
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HitBox

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