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<1…18192021222324…34>
  • Spectrum + keyboard issueMy Spectrum+ seems to have some trouble on Space Key. Sorry for all "seem" in the following text. But it's hard to understand if it's a real steady t…

    ... the size of the databus decoupling resistors and the load on ...
    csmith csmith December 2009 Hardware
  • memory chips spectrum +Hi with regards to memory chips the ones in there are tms4116 in the lower memory.there is some on ebay MCM4116BP20 can i mix these with tms ones or …

    ... chip needs -5V, +5V and 12V and a common fault is ... that creates the -5V and +12V supplies fails. There are instructions ...
    zx2628 zx2628 January 2010 Hardware
  • Spectrum Video Circuitry.Wotcha, I've looking at the circuit diagram of the speccy video circuitry (Hey, I'm snowed in, and theres only so much Civ IV i can stand :p), and I…

    [QUOTE=spodula;414673]Also, whats the purpose of VCC2 from the ULA?[/QUOTE]

    Vcc2 power the analogue parts inside the ULA (video and tape sections). R34 and C30 are voltage decoupling components.
    Gods Gods January 2010 Hardware
  • need help with +3 sound mod..well my friend has been doing the mod.. and well informed me the info / instructions aren't 100% there.. basically the matrix of cap's / resisters i…

    ... already use one to supply 12v for my RGB->SVIDEO ...
    nuggetreggae nuggetreggae January 2010 Hardware
  • Spectrum +2A -Black screen-When I turn on the power I get only black screen (full size) PSU is working (I even tried with my +3 PSU) RF-cable is working. What could be the pro…

    Are you getting the right voltages from the power supply? If the 12V is absent, you'll get a black screen.
    Winston Winston January 2010 Hardware
  • Spectrum 48k - Many ProblemsHi, I'm new to the boards and to owning a Spectrum, and sadly, it doesn't work properly. I'd been using an emulator for a while but I decided I'd lik…

    ... these chips (+5v, -5v and +12v). If the -5v supply has ...
    Winston Winston January 2010 Hardware
  • Spectrum 48k - Many ProblemsHi, I'm new to the boards and to owning a Spectrum, and sadly, it doesn't work properly. I'd been using an emulator for a while but I decided I'd lik…

    48K needs the internally generated 12V to produce video.
    roko roko January 2010 Hardware
  • ZX Spectrum Power SupplyHi All, I've come across a power supply that is currently registering 14.5v before it is plugged into the Speccy. I have another one that registers…

    ... necessary. ;)

    The nominal 12V input is a "sweet spot ...
    RetroTechie RetroTechie February 2010 Hardware
  • zx spectrum 128K+2(gray)-vanishing colorsHi, I just got "new" zx spectrum 128k+2(gray) made in uk version. Beside tape dead and memory issue - only first 16k RAM works in 48k mode, it has s…

    ... colors can be TEA2000 or... +12V line issue. But I'm ...
    kpuchatek kpuchatek February 2010 Hardware
  • ZX Spectrum Power SupplyHi All, I've come across a power supply that is currently registering 14.5v before it is plugged into the Speccy. I have another one that registers…

    ... produces -5v and +12v for the ram, and +12v for the Colour ... run a speccy off a 12v car adapter (The car wasnt ...
    spodula spodula February 2010 Hardware
  • PSU unit spectrum 128k +2b 6 pinout DINHello everybody! I have spectrum 128k +2B but I don't have the 6 pin PSU and I can't find it anywhere. Can you anyone tell me where can I buy this PS…

    ... adapters don't have the -12v, it's not absolutely necessary ... . I think the -12v is only needed for rs232 ...
    zxbruno zxbruno February 2010 Hardware
  • PSU unit spectrum 128k +2b 6 pinout DINHello everybody! I have spectrum 128k +2B but I don't have the 6 pin PSU and I can't find it anywhere. Can you anyone tell me where can I buy this PS…

    ... use different voltages (5V and 12V). How can I use a ...
    groove groove February 2010 Hardware
  • PSU unit spectrum 128k +2b 6 pinout DINHello everybody! I have spectrum 128k +2B but I don't have the 6 pin PSU and I can't find it anywhere. Can you anyone tell me where can I buy this PS…

    Can I take the cables of a 24 pin connector from a PC PSU like this [url]http://pinouts.ru/Power/atxpower_pinout.shtml[/url] and connect the +12V,+12V,-12V,5V,GND cables to the 6 pin connector? thanks
    groove groove February 2010 Hardware
  • PSU unit spectrum 128k +2b 6 pinout DINHello everybody! I have spectrum 128k +2B but I don't have the 6 pin PSU and I can't find it anywhere. Can you anyone tell me where can I buy this PS…

    ... .shtml[/url] and connect the +12V,+12V,-12V,5V,GND cables to the ...
    zxbruno zxbruno February 2010 Hardware
  • PSU unit spectrum 128k +2b 6 pinout DINHello everybody! I have spectrum 128k +2B but I don't have the 6 pin PSU and I can't find it anywhere. Can you anyone tell me where can I buy this PS…

    But the +12V of the PC PSU works @12A +5VDC @25A . Wont the intensity of corrent blow with the spectrum?
    Spectrum actually works with +12V @ 0.7A and +5V@ 2A, it's very lower.
    groove groove February 2010 Hardware
  • PSU unit spectrum 128k +2b 6 pinout DINHello everybody! I have spectrum 128k +2B but I don't have the 6 pin PSU and I can't find it anywhere. Can you anyone tell me where can I buy this PS…

    [QUOTE=groove;426515]But the +12V of the PC PSU works @ ... ?
    Spectrum actually works with +12V @ 0.7A and +5V@ 2A ...
    guesser guesser February 2010 Hardware
  • Spectrum 128+ (No TV picture)I got a Spectrum 128+ which is not generating any picture. I checked the TEA2000, and it gets not 12 Volt, but only 1.4, so this is the problem, I gu…

    ... and 9V are all okay, -12V is in reality +11.4 ... /> A repaired one +128K without +12V and I had to change ...
    Jose_Leandro Jose_Leandro March 2010 Hardware
  • Two new programs from Mitchell Software :)Hi everyone, What a lovely day it is on the Isle of Wight, bright sunny and cold. If you head over to my website and look into the software sectio…

    ... as pull down resistors and decoupling capacitors. If you [I]really ...
    Robin Robin March 2010 Games
  • 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…

    ... -5V, Pin 8 should be +12V, Pin 9 should be +5V ... . If -5V or -12V are absent or much lower ...
    RST#08 RST#08 March 2010 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…

    [QUOTE=gibs;431121]... 4/ how to check TR4/TR5 ?[/QUOTE]
    When -5V and +12V (at 4116) are present then both transistors work OK. So you checked already.
    roko roko March 2010 Hardware
  • Crappy video in +2B/+3Maybe it's not a failure in my ZX Spectrum, but I need some advice... I've got some spectrums (a ZX Spectrum +, two spanish ZX Spectrum +2B and a mo…

    ... 5V en lugar de a 12V
    - A?ade un condensador ... colector to 5V instead of 12V
    - Add a capacitor of ...
    mcleod_ideafix mcleod_ideafix March 2010 Hardware
  • Crappy video in +2B/+3Maybe it's not a failure in my ZX Spectrum, but I need some advice... I've got some spectrums (a ZX Spectrum +, two spanish ZX Spectrum +2B and a mo…

    ... 5V en lugar de a 12V
    - A?ade un condensador ... colector to 5V instead of 12V
    - Add a capacitor of ... other mod is connected to +12v. Would help connecting to TEA2000 ...
    Zup Zup March 2010 Hardware
  • Midi out on a ZX SpectrumYears ago (may be over 15 years...) I soldered a small adapter that lets a keyboard or synthesizer connect to the ZX Spectrum 128K's midi/RS232 port.…

    ... the circuits that requires 12v, check that the 12v line from the ...
    guesser guesser March 2010 Hardware
  • Midi out on a ZX SpectrumYears ago (may be over 15 years...) I soldered a small adapter that lets a keyboard or synthesizer connect to the ZX Spectrum 128K's midi/RS232 port.…

    ... the circuits that requires 12v, check that the 12v line from the ... !
    It is not the 12V that is missing but the ... -12V... I am using a small ... power connector also has a -12V line...

    So, other ...
    bverstee bverstee March 2010 Hardware
  • Midi out on a ZX SpectrumYears ago (may be over 15 years...) I soldered a small adapter that lets a keyboard or synthesizer connect to the ZX Spectrum 128K's midi/RS232 port.…

    ... it wouldn't have the -12V required for the serial ports ...
    zxbruno zxbruno March 2010 Hardware
  • +3 broken with broken disk drive.Ok, so today at a car boot sale I picked up a Spectrum +3 for ?5. It's in good condition, powers up and works well. However, the disk drive does not…

    ... probably, but also, check the 12v of the PSU.

    xc8 xc8 March 2010 Sinclair Miscellaneous
  • Broken or upgraded ZX Spectrum 48kHello First i want to say hello to everybody. I have a new ZX Spectrum 48k in my collection. Seller said that it is broken (no picture). I have this…

    ... is 10,6V should be 12V

    None of the ...
    gottrek gottrek April 2010 Hardware
  • Broken or upgraded ZX Spectrum 48kHello First i want to say hello to everybody. I have a new ZX Spectrum 48k in my collection. Seller said that it is broken (no picture). I have this…

    ... , and the supply voltage for +12V indicated above, is definately sufficient ...
    RetroTechie RetroTechie April 2010 Hardware
  • Trying to fix Spectrum Issue TwoHello everybody, I bought from eBay three Spectrums - one is Issue Two and the other two are Issue 3. The Issues 3s look like they are working but t…

    ... not tell whether a (ceramic) decoupling capacitor is still capable of ...
    roko roko April 2010 Hardware
  • Trying to fix Spectrum Issue TwoHello everybody, I bought from eBay three Spectrums - one is Issue Two and the other two are Issue 3. The Issues 3s look like they are working but t…

    ... the coil is buzzing. The +12v is now good (can't ...
    Valentin Valentin April 2010 Hardware
<1…18192021222324…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
  • Celebrity deaths...
    mel the bell on April 20

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