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  • ZX Spectrum +3 Query...Hi all, As common, I brought down my Spectrum from the attic the other day to have another stab at getting it running. I knew from the past it was a…

    ... be a problem there. What voltages do you measure when the ...
    Crimbo Crimbo March 2011 Hardware
  • ZX Spectrum +3 Query...Hi all, As common, I brought down my Spectrum from the attic the other day to have another stab at getting it running. I knew from the past it was a…

    ... />
    [QUOTE=guesser;520762]What voltages do you measure when the ...
    Crimbo Crimbo March 2011 Hardware
  • ZX Spectrum +3 Query...Hi all, As common, I brought down my Spectrum from the attic the other day to have another stab at getting it running. I knew from the past it was a…

    ... the +3 only have three voltages +5, +12 and -12....
    Zetr0 Zetr0 March 2011 Hardware
  • ZX Spectrum +3 Query...Hi all, As common, I brought down my Spectrum from the attic the other day to have another stab at getting it running. I knew from the past it was a…

    ... the +3 only have three voltages +5, +12 and -12.... [/QUOTE ...
    guesser guesser 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…

    ... (probably) two sources are outputting voltages against each other. So Velesofts ...
    roko roko April 2011 Hardware
  • The Dragon 32/64 threadI got a Dragon 64 a few years ago. Not many games included though. Back in the day, they always reminded me of the BBC with its shape. There always…

    ... for them , it's 2 voltages.. I think only 1 works ...
    fog fog April 2011 Chit chat
  • Amperage drastic reduction in a rubber 48KWell, I am now with the approach of a drastic reduction ZXSpectrum amperage. As a first step would change the Z80 processor for other (Z80C). Unfortu…

    ... are already setting up DC voltages, I would remove the 7805 ...
    Zetr0 Zetr0 April 2011 Hardware
  • Amperage drastic reduction in a rubber 48KWell, I am now with the approach of a drastic reduction ZXSpectrum amperage. As a first step would change the Z80 processor for other (Z80C). Unfortu…

    ... , which means that the supply voltages that are within a very ...
    Mobutu Mobutu April 2011 Hardware
  • ZX Spectrum 48k issue 3b power problem?Hi :) I was lucky enough to find a couple of ZX Spectrums at a car boot sale yesterday. I spent the evening fiddling about with one (issue 2) and t…

    ... to check that all the voltages are correct. The PSU supplies ...
    john58 john58 April 2011 Hardware
  • now lost the +5v from my +3 psuthe voltages i get from it are -12v +12v +0.61v what part needs replacing in the housebrick that is the PSU? having a bad weekend :-(

    [QUOTE=reanimator;531131]the voltages i get from it are< ...
    guesser guesser May 2011 Hardware
  • now lost the +5v from my +3 psuthe voltages i get from it are -12v +12v +0.61v what part needs replacing in the housebrick that is the PSU? having a bad weekend :-(

    ... /> If you could measure the voltages present on the transformer windings ...
    guesser guesser May 2011 Hardware
  • now lost the +5v from my +3 psuthe voltages i get from it are -12v +12v +0.61v what part needs replacing in the housebrick that is the PSU? having a bad weekend :-(

    what should the voltages be for the transformer windings ?
    reanimator reanimator May 2011 Hardware
  • now lost the +5v from my +3 psuthe voltages i get from it are -12v +12v +0.61v what part needs replacing in the housebrick that is the PSU? having a bad weekend :-(

    ok checked the voltages and get these

    ...
    reanimator reanimator May 2011 Hardware
  • now lost the +5v from my +3 psuthe voltages i get from it are -12v +12v +0.61v what part needs replacing in the housebrick that is the PSU? having a bad weekend :-(

    ... =reanimator;531760]ok checked the voltages and get these

    guesser guesser May 2011 Hardware
  • New speccy modelThe 48k toastrack ;) [img]http://alistairtesting.no-ip.org/48k-toastrack.jpg[/img]

    ... tracks for direct +12 / -12 voltages from the ATX...

    Zetr0 Zetr0 May 2011 Hardware
  • 48k dots appear but not with CUB monitorToday I tried out an issue 3 and an Issue 2 with the CUB monitor, to my surprise they both worked flawlessly, now before when I tried them on any oth…

    ... isolation between AC and DC voltages.

    On the other ...
    mcleod_ideafix mcleod_ideafix June 2011 Hardware
  • 48k dots appear but not with CUB monitorToday I tried out an issue 3 and an Issue 2 with the CUB monitor, to my surprise they both worked flawlessly, now before when I tried them on any oth…

    ... stray current may create unwanted voltages somewhere. But such is rarely ...
    roko roko June 2011 Hardware
  • Dead 128 ToastrackHi! I bought 128 toastrack motherboard and seller said it's working. Maybe it was when he sent it but motherboard was only put into envelope. So it …

    ... multimeter so you can check voltages.

    I would start ...
    Zetr0 Zetr0 June 2011 Hardware
  • rubber key Spectrum 48k problem :(when i plug the spectrum in all i get is a black screen with a red border and sometimes flashing blocks. the spectrum worked until about 20 mins ago…

    ... is [i]always[/i] the voltages on the 16K lower RAM ... still don't get the voltages, turn the machine off [i ... /> If you get the correct voltages, it may boot. If it ... no hot chips, and all voltages are good, chances are you ...
    Spirantho Spirantho June 2011 Hardware
  • Microdrive using simple coilWhile listening to my iPod using cassette car adapter I came to idea - why not doing the same for the microdrive? Anyone ever tried that? Do you thin…

    ... wires, two coils, understanding the voltages involved and something like this ...
    tstih tstih July 2011 Hardware
  • Got a PC to mend, need some opinionGot this PC in yesterday to mend, what happened was after a load of updates and after a complete shutdown, the next day he goes to turn it on and rig…

    ... give out all the possible voltages, and some people think they ...
    zxbruno zxbruno July 2011 Chit chat
  • Spectrum not working, can anyone help this lady?[URL="http://www.retrogamer.net/forum/viewtopic.php?f=6&t=29734#p674152"]http://www.retrogamer.net/forum/viewtopic.php?f=6&t=29734#p674152[/URL]

    ... 4116 DRAM's and measure voltages at the three rail pins ...
    mcleod_ideafix mcleod_ideafix July 2011 Sinclair Miscellaneous
  • +2/+3 Sync problem on Commodore 1084sI have a strange issue, I got an RGB monitor cable from ebay for the +2/+3 to the Commodore 1084s (d-sub socket). It works fine on my Spectrum+ 128k …

    ... composite sync, which drops the voltages down a bit I guess ...
    RobeeeJay RobeeeJay July 2011 Hardware
  • Composite spectrum problemHowdy, Found an old rubber key in a bag full of games recently which had seen better days. Rigged it up and to my suprise it worked! It needed som…

    ... wire, because these are low voltages in the modulator, nothing that ...
    Hedegaard Hedegaard July 2011 Sinclair Miscellaneous
  • Composite spectrum problemHowdy, Found an old rubber key in a bag full of games recently which had seen better days. Rigged it up and to my suprise it worked! It needed som…

    ... (one of) the powerlines. Checking voltages (-5, +5, +12) might be ...
    roko roko July 2011 Sinclair Miscellaneous
  • Composite spectrum problemHowdy, Found an old rubber key in a bag full of games recently which had seen better days. Rigged it up and to my suprise it worked! It needed som…

    ... (one of) the powerlines. Checking voltages (-5, +5, +12) might be ...
    LCD LCD July 2011 Sinclair Miscellaneous
  • Power Supply fuse ratingHi, I've hunted about a good bit but not been able to track down any info, so: I am sorting out my spectrum power supplies just now and want to mak…

    ... +3 power supply offers three voltages (+5v, +12v and -5v), and ...
    Zup Zup July 2011 Hardware
  • try to fix issue 4 board problemHi I try to fix speccy 48. All voltages are in place, ula 100% ok, cutted +5v from ic25 so far no luck. What next? ROM or upper memory? wojtek (i…

    If voltages ok, then 4116 lower 16K memory (most likely) or ROM.

    It's tricky to tell.... Do the 4116's get hot?
    csmith csmith August 2011 Hardware
  • Help with Spectrum 128k reparationHi! I have the following symptoms with a 128k unit version 6U - On power on, black and white bars (one char width each), white background - Once po…

    ... was working fine), and measure voltages at the edge connector, everyone ... />
    I want to measure voltages on the RAM, but it ...
    kwyjibo kwyjibo September 2011 Hardware
  • Dead Spectrum+Hi! Any suggestions where to start finding what's broken: Spectrum+ with issue 6A motherboard and nothing on TV. Top row of the upper memory chips g…

    Try to replace ULA with working one. Working low memory should be enough to see the screen. Check all voltages. Hot RAM = bad, probably.
    kpuchatek kpuchatek September 2011 Hardware
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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
  • Celebrity deaths...
    mel the bell on April 20

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