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<1…19202122232425…34>
  • What's the correct Spectrum colour palette?Prompted by the recent SCR-to-GIF conversion thread, I was pondering writing one in Z80 assembler. As I did a LZW compression routine a while ago tha…

    ... , there is no specific ULA voltages on the you can say ...
    BloodBaz BloodBaz November 2012 Development
  • Is this Spectrum dead?Hello. First post and all that... I have an old Spectrum +3 which has sat on a shelf for many years. Yesterday, when I plugged it in for the first…

    The red LED is fed off the +5V line from the PSU. So if you have a meter check if you have the correct voltages on the output plug (be careful not to short any of the connections).
    Or if you have another PSU, test the Speccy again.

    Mark
    1024MAK 1024MAK November 2012 Hardware
  • My 48K Speccy has died.Hi fellow WoSer's! Wondering if you could help me with my rubber key 48k Spectrum, which died on me this afternoon. It is one I prevoiusly fixed up j…

    ... lower RAM, make sure all voltages are present (search for TMS4116 ...
    Winston Winston November 2012 Hardware
  • My 48K Speccy has died.Hi fellow WoSer's! Wondering if you could help me with my rubber key 48k Spectrum, which died on me this afternoon. It is one I prevoiusly fixed up j…

    ... like Winston said: check supply voltages first.
    RetroTechie RetroTechie November 2012 Hardware
  • My 48K Speccy has died.Hi fellow WoSer's! Wondering if you could help me with my rubber key 48k Spectrum, which died on me this afternoon. It is one I prevoiusly fixed up j…

    ... replies. I will check the voltages tomorrow and see if they ... easy.

    If the voltages are good then I will ...
    Your Spec-chum Your Spec-chum November 2012 Hardware
  • My 48K Speccy has died.Hi fellow WoSer's! Wondering if you could help me with my rubber key 48k Spectrum, which died on me this afternoon. It is one I prevoiusly fixed up j…

    ... signal and make all the voltages back to as they were ...
    Spirantho Spirantho November 2012 Hardware
  • Issue 2 problemHeres a video of what happens when I fire up an Issue 2 board ive had hanging around for ages, this is with Paul Farrows RAM test cart in btw If this…

    The border turns 'white' (which I've read is done by the Z80), and it looks like a RAM test is being done. So if it's one of the causes you mention, I'm betting lower 16K RAM.

    Btw. did you check supply voltages?
    RetroTechie RetroTechie November 2012 Hardware
  • Issue 2 problemHeres a video of what happens when I fire up an Issue 2 board ive had hanging around for ages, this is with Paul Farrows RAM test cart in btw If this…

    I checked the supply voltages, all within range, now then, which lower memory to start with, sods law if I work from left to right it will be the one furthest to the right and vice vera! lol
    Macc Macc November 2012 Hardware
  • My 48K Speccy has died.Hi fellow WoSer's! Wondering if you could help me with my rubber key 48k Spectrum, which died on me this afternoon. It is one I prevoiusly fixed up j…

    ... had chance to check the voltages yet and with Ian offering ...
    Your Spec-chum Your Spec-chum November 2012 Hardware
  • Sinclair ZX Spectrum FAILS latest radio noise rules SHOCKCan I really be the first to have mention this? Article on El Reg reports: [url]http://www.theregister.co.uk/2012/12/13/sinclair_spectrum_fails_mode…

    On complex boards like a PC you don't route regulated voltages around across the board either. It's easier to put a separate small voltage regulator and honking great filter caps near each subsystem and power it all off big fat 12v rails
    guesser guesser December 2012 Chit chat
  • FS: Spectrum +2ARather than muck about with ebay again, throwing it out here, working Spectrum +2A, on its own, ?25 + shipping, PM me if anyones interested. [url=htt…

    ... small power supply with three voltages including -12V.
    A standard ...
    bverstee bverstee December 2012 Sales
  • FS: Spectrum +2ARather than muck about with ebay again, throwing it out here, working Spectrum +2A, on its own, ?25 + shipping, PM me if anyones interested. [url=htt…

    ... small power supply with three voltages including -12V.
    A standard ...
    DaRkHoRaCe DaRkHoRaCe December 2012 Sales
  • Another cause for DivIDE problems on 48K'sThe last months some topics were opened to discuss problems with 48K ZX Spectrums and DivIDE. Sofar we found: - Bad Z80's because of poor fanout (si…

    ... simulation and choose to see voltages at the input of both ...
    mcleod_ideafix mcleod_ideafix December 2012 Hardware
  • Another cause for DivIDE problems on 48K'sThe last months some topics were opened to discuss problems with 48K ZX Spectrums and DivIDE. Sofar we found: - Bad Z80's because of poor fanout (si…

    ... simulation and choose to see voltages at the input of both ...
    bverstee bverstee December 2012 Hardware
  • ZX Spectrum 48K help and Hello :)Hello out there I am a long time admirer of the ZX Spectrum range of computers my first go at one was in the early 1980s with my dads ZX 80 now its …

    ... whether the various power supply voltages are present in the correct ...
    Zorn Zorn January 2013 Hardware
  • ZX Spectrum 48K help and Hello :)Hello out there I am a long time admirer of the ZX Spectrum range of computers my first go at one was in the early 1980s with my dads ZX 80 now its …

    ... supply that supplies the odd voltages the 4116 memory needs is ... .

    First check the voltages to the lower 16K RAM ... chips, if any of these voltages are not present (especially -5v ... detail).

    If the voltages are present, the lower 16K ...
    Winston Winston January 2013 Hardware
  • Want a new old PC.Does anyone know of any good place that sell slightly older desktop PC's very cheap? The motherboard in mine is on its way out. Think there is a cr…

    ... .

    I tested the voltages and the current both loaded ...
    FrankT FrankT January 2013 Chit chat
  • Revive Spectrum +3 power supply(ies)Hi all, it's me again... [url]http://www.worldofspectrum.org/forums/showthread.php?t=33677[/url] In continuation from last time, I have two original…

    oh my, that's not pretty!

    Looks like the rectifier exploded :-o
    guesser guesser January 2013 Hardware
  • Revive Spectrum +3 power supply(ies)Hi all, it's me again... [url]http://www.worldofspectrum.org/forums/showthread.php?t=33677[/url] In continuation from last time, I have two original…

    Yes it looks like your rectifier bridge was infected with a ...
    Zetr0 Zetr0 January 2013 Hardware
  • Revive Spectrum +3 power supply(ies)Hi all, it's me again... [url]http://www.worldofspectrum.org/forums/showthread.php?t=33677[/url] In continuation from last time, I have two original…

    ... ]Yes it looks like your rectifier bridge was infected with a ... diodes that form the bridge rectifier did not like the short ...
    1024MAK 1024MAK January 2013 Hardware
  • Faulty French +2 grayA friend of mine has a faulty french +2 grey model. The picture its giving out is this... [URL=http://imageshack.us/photo/my-images/19/post2036357600…

    ... />
    I would check the voltages +12, +5 and -5 and ...
    Zetr0 Zetr0 January 2013 Hardware
  • Faulty French +2 grayA friend of mine has a faulty french +2 grey model. The picture its giving out is this... [URL=http://imageshack.us/photo/my-images/19/post2036357600…

    [QUOTE=gtsamour;679360]LOL @ merde
    [/QUOTE]

    the codename for the +3 is "zoot alurs" :) . but check voltages with a le meter.. there is the flow diagram in the service manual for fault finding also
    fog fog January 2013 Hardware
  • Revive Spectrum +3 power supply(ies)Hi all, it's me again... [url]http://www.worldofspectrum.org/forums/showthread.php?t=33677[/url] In continuation from last time, I have two original…

    ... ]Yes it looks like your rectifier bridge was infected with a ... />
    Thanks. So I need rectifier diodes, for the higher current ... ?

    i.e. 1N4001 rectifier diode?
    Crimbo Crimbo February 2013 Hardware
  • Revive Spectrum +3 power supply(ies)Hi all, it's me again... [url]http://www.worldofspectrum.org/forums/showthread.php?t=33677[/url] In continuation from last time, I have two original…

    ... , those are for the other rectifier. Recifier 3 uses 1N5391s which ... -Components/1N5401-3A-100V-Silastic-Rectifier-47-0818"][/URL][/B]
    guesser guesser February 2013 Hardware
  • ahh..sooo close :) Spec128k+ RGB on LCD monitor helpHello, Was trying out RGB on my 128k+ and a Samsung Syncmaster 204 lcd monitor. Tried this monitor with a Genesis/Megadrive and a SNES and works real…

    ... most fussy, requiring the correct voltages and not being happy if ...
    1024MAK 1024MAK February 2013 Hardware
  • Speccy 48K grey screenGot a issue 2 48K speccy as part of a job lot on ebay, tested it and apart from a duff membrane it appears to be working. However the screen is a gre…

    ... , have you checked all supply voltages?
    RetroTechie RetroTechie February 2013 Hardware
  • ZX SPECTRUM 48K color problemsHello, I am asking for your help... I found a ZX spectrum in a garage of a friend. He gave it to me telling that it didn't work. To say the truth it…

    ... /> Have you checked all supply voltages? At a 4116 RAM chip ...
    RetroTechie RetroTechie February 2013 Hardware
  • +2 (Grey) and AT/ATX PSUAny ideas on the best way to power a grey +2 board from an AT or ATX PSU? Looking at the schematic, I could do this one of two ways... 1: Bypass th…

    ... supply to generate the other voltages.

    What you could ... circuits entirely and inject the voltages through the expansion port. Unlike ... anything besides generating the other voltages so you can forget about ...
    guesser guesser February 2013 Hardware
  • Video output questions...Two questions... [QUOTE]1. The yellow and blue colours seem out of phase on the display. Is this normal for an RF connection to the TV/monitor?[/QUO…

    ... . Sony) are fussy and want voltages at the upper end of ... with slightly lower control / switching voltages.

    I got most ...
    1024MAK 1024MAK February 2013 Hardware
  • :TECH Question for people who order componentsHi all. I am looking for a component but seem unable to find a supplier anywhere globaly that does not require tradng references and would be willing…

    ... a regular transformer -> bridge rectifier -> electrolytic capacitor -> voltage ...
    RetroTechie RetroTechie March 2013 Chit chat
<1…19202122232425…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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