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  • zx spectrum +2A power supply missing -12v voltshey.. i'm looing at a zx spectrum +2A power supply that the -12v rail seems to be missing .. it has the 12 volts and 5 volts .. it is the version wit…

    ... missing .. it has the 12 volts and 5 volts .. it is the version ... happens and goes to the 5 volt and -12v rail ,,, confused ...
    mark8bit mark8bit November 2020 Hardware
  • Input/Output on Edge ConnectorI would like to sense a pulse on the data bus via the edge connector, i.e. on or off. How do you decide what port it is on? I would also like to send…

    ... . +5 volts is logic 1, 0 volts is logic 0. M1 is high (+5 volts ... documents section for the Kempston joystick interface schematics - that will show ...
    Winston Winston October 2007 Hardware
  • Where shall I start to look ?I got hold of a faulty 48k, Issue 6. It displays a picture like shown below: [URL]http://www.gjelberg.no/miscpics/speccyfault.jpg[/URL] Some of the…

    ... every second.

    +5 and -5 volts are present.
    I also ...
    Pilsener Pilsener December 2007 Hardware
  • +3 PSU PoorlyI have a +3 that just stopped working. Its the psu thats gone and opening it up discovered a blown fuse. After replacing the fuse it still doesnt wor…

    ... still doesnt work. Theres no +5 volts at the connector and have ...
    ZX-MAD ZX-MAD May 2008 Hardware
  • Spectrum 48K input voltageI have a power supply that is rated 9,5 Volts DC. With no load it outputs about 9,86 Volts. Is it safe to use it for ZX Spectrum 48K? (it can do …

    I have a power supply that is rated 9,5 Volts DC.
    With no load it outputs about 9,86 Volts.

    Is it safe to use it for ZX Spectrum 48K?
    (it can do over 2 Amperes)
    orange orange May 2008 Hardware
  • Analogue BeeperThere's been a discussion on foro.speccy.org about multichannel beeper stuff, and since I had the camera out and the scope set up, I set about demons…

    ... , the output of BEEP 10,5 - note that it's not ... /> The amplitude is about 2.5 volts. Now on the same voltage ... amplitude is only about 0.5 volts here.

    Not a ...
    Winston Winston January 2009 Development
  • Broken keyboard due to broken ULARecalling csmith's thread about dead ULAs, a thread appeared in the Zonadepruebas (Spanish) forum regarding... a dead ULA, but only a partially dead …

    ... is a tristate buffer, 5 bits wide. Going into ... blue cable, the power (5 volts and ground). With the ... the keyboard lines at +5 volts (logic 1), and this ... ULA keep these pins at 5 volts.

    To ... PIN 4 = A0;
    PIN 5 = KB0;
    PIN 6 = ...
    Winston Winston October 2010 Hardware
  • 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…

    ... circuit is powered by a 5 volt supply. After simulating ... the mid point is 2.5 volts, I opted to make it ... a little higher, at 3 volts. So the "zero" signal ... is at 3 volts. The maximum the signal can ... we need, compared with a 5 cent coin (same size ...
    Winston Winston December 2010 Hardware
  • Scotties Ebaying AgainRight in my listings at the moment are: [LIST] [*]Yamaha PSR 510 Keyboard , Sequencer and Synthesiser - Great sounds many buttons [*]The Gambols - C…

    ... Plug and Play TV Game Joystick 5 Games with Pac Man
    Joystick, Paddles, PSU and 3 Games ...
    Scottie_uk Scottie_uk November 2011 Sales
  • ZX81 internal RAM board?Just a quick question to Zorn (amongst others). What would the issues be with fitting one of Zorn's RAM boards into an unexpanded ZX81? Seems to me…

    ... Zorn's board only needs 5 volts, I'm wondering how easy ...
    DEATH DEATH October 2014 Hardware
  • Issue 1 oddityHello to everybody, I have a very first under my hands - a broken Issue 1. Apart from the classic "broken lower RAM" syndrome which will be easily t…

    ... ) shows a tad over 4.5 Volts, just as other correctly working ...
    Falco-F8L Falco-F8L November 2014 Hardware
  • Auto fire joysticks on spectrum +2 grey?Sorry if this has been asked elsewhere.. Autofire joysticks that require +5 volts on pin 7 will not work of course, but what would happen if a…

    ... />
    Autofire joysticks that require +5 volts on pin 7 will not ...
    Renegade Renegade April 2018 Hardware
  • zx spectrum +2 no clock signal ??help me ...... looking at a specie +2 (original +2) it is the Z70700 issue 1 (uk one) i seem to have no clock,no display,no sound at all. it is sho…

    ... at all. it is showing 5 volts from the reg and 12 ... volts on the tea 2000 (well ...
    mark8bit mark8bit July 2020 Hardware
  • Programming Sound EffectsHi guys, Have decided, probably due in some way to my midlife crisis, to tart up and re-release (or even just re-lease) the old 48K Speccy games I w…

    ... ofcourse the value off 6.5 bits.
    When you had ... earsocket read at 0 and 5 volts.
    So thats a 1 ...
    Alcoholics Anonymous Alcoholics Anonymous October 2004 Development
  • Any other real Spectrum users in the USA?Hi, I bought a Spectrum +2a off e-bay (I collect old computers) and managed to make it run here in the US. I'm curious; is anybody else running an a…

    ... power requirements are +12, +5, and -12 volts, it'll actually work ... off of just +5. The -12v ... with providing it just the 5 volts. It has to be regulated ...
    blue lander blue lander September 2005 Sinclair Miscellaneous
  • Which expansions can I attach to a +2A?I have several peripherals that I would like to connect to a +2A: an Interface 1 with Microdrive, a +D disk interface and kempston joystick interface…

    ... that pin is connected to 5 volts the internal ROM chip is ...
    KeepGood KeepGood October 2005 Sinclair Miscellaneous
  • Sound mod for AY audio chipsHi again. This is a repost. I posted it in the misc forum a while back but it definitely should be in here. I was totally pissed off with the crap…

    ... a +2 is powered by 5 volts.

    I've just ...
    KeepGood KeepGood November 2005 Hardware
  • Woody?s Tape2wav tested[quote] I've uploaded a new version of Tape2WAV to the same URL as given above. Any chance of giving this version a quick test? [/quote] Hi Woody, …

    ... drive EAR with 3 to 5 volts worth of signal.

    Marcelo Marcelo February 2006 Development
  • Noisy 2A displaymy 2A gives a fairly good display until it has to generate sound or other cpu work, which interferes with the signal, giving some "cloudy" effects …

    ... well over 20 AMPS at +5 volts - you can weld (albeit badly ...
    DEATH DEATH July 2006 Hardware
  • Joystick compatibility on the +2AHey folks, now my +2A is working, I decided to find some more problems (not really...I didn't "decide"! :( ), basically the joysticks won't work prop…

    ... . You can get +12 or +5 volts from 2 open via's ...
    dasteph dasteph July 2006 Hardware
  • I dont know what I want this Christmas?Any ideas on what I should ask for this christmas, my wifes asking me and I haven't a clue. I think a Wii is out of the question as I finances are t…

    Um no thanks I can think of better things to do with 5 Volts than that. :D
    Scottie_uk Scottie_uk December 2006 Chit chat
  • Just got a Spectrum +2BThis is the first Spectrum I've ever used or owned. I got it without a video cable or power supply. I wired up a proper video cable, and I altered an…

    Or this : LM323K, which gives 5 Volts and 3 amps
    Pilsener Pilsener February 2007 Hardware
  • AV CableI have purchased an AV Cable for my Sega Mega Drive. Since it has a 5 Pin DIN connector, which fits into the 8 Pin DIN socket, I presume it will wor…

    ... on a megadrive may be 5 volts, Pin 1 on a spectrum ... .g. green signal a nice 5 volt connection or a ground ...
    MrCheese MrCheese March 2007 Hardware
  • 5v Transformer.I've got a 5v 3A transformer, would this be ok to use with two 3.5 inch floppy drives?

    ... 'll get a rock steady 5 volts out even if the power ...
    Winston Winston March 2007 Hardware
  • ZX Spectrum 128+ problemsHello!I recently purchased and got myself a spectrum 128+ from ebay.The item did not have an original power supply so i got a power supply of 9volts …

    ... put out something like 12 volts (the supply is labelled 9v ... supply put out 12.75 Volts. This why i bought an ... and switched to 7.5 Volts output.
    7.5 V is sufficient ...
    Gods Gods July 2007 Hardware
  • Poorly Spectrum + Fault diagnosis help needed!Hi, I've got a Spectrum+. Sometime in the past I broke it and sent it off to be fixed. It came back working good as new, but with an issue 2 board i…

    ... 1: Should show -5v (MINUS 5 volts)
    Pin 8: Should show ...
    Winston Winston July 2007 Hardware
  • Voltage SchmoltageOk then. Don't flame for wanting to use a C64 tape deck for this - it was the only one I have to hand which may be cannibalised for the purpose. So …

    Could you not get power from a USB connection??

    I know USB power is only 5 volts though, I dont know if that will that present a major problem?

    Andrew.
    Scottie_uk Scottie_uk July 2007 Chit chat
  • Input/Output on Edge ConnectorI would like to sense a pulse on the data bus via the edge connector, i.e. on or off. How do you decide what port it is on? I would also like to send…

    One thing you might want to do, then, is get hold of some breadboard - and a collection of 74-series logic, and a 7805 regulator (so you can get 5 volts), a bag of 50 or so 5 volt LEDs and experiment for a bit. You'll find it very instructive.
    Winston Winston October 2007 Hardware
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