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  • Diagnosing Spectrum 48k (faulty RAM chip?)I have a Spectrum 48k (I believe it may be an upgraded 16k model) that doesn't work, and never has ever since the owner gave it to me. When you turn …

    ... ).

    The lower-than-12v suggests that something is loading ...
    Winston Winston November 2009 Hardware
  • Diagnosing Spectrum 48k (faulty RAM chip?)I have a Spectrum 48k (I believe it may be an upgraded 16k model) that doesn't work, and never has ever since the owner gave it to me. When you turn …

    ... =Winston;398708]The lower-than-12v suggests that something is loading ...
    RetroTechie RetroTechie November 2009 Hardware
  • Piracy (a good solution for both sides?)A week or two back, Micro-Mart wrote an interesting article about software piracy, although they didn't say anything new, as there's little if anythi…

    ... . The whole thing has a ripple effect.. much like how people ...
    fog fog November 2009 Chit chat
  • Alternative power supply for a +2B?Hi friends, On impulse, I recently bought a ZX Spectrum +2 (unit only, untested) on eBay, thinking that the cables (specifically the power supply) o…

    ... br /> The +2B needs +5V, +12V and, if memory serves me ... well, -12V. The only critical voltage here ... is +5V. +12V is used to feed the ... the RS232 line converters. -12V is used for RS232 ... power jack to take +12V also from the monitor, ...
    mcleod_ideafix mcleod_ideafix December 2009 Hardware
  • Alternative power supply for a +2B?Hi friends, On impulse, I recently bought a ZX Spectrum +2 (unit only, untested) on eBay, thinking that the cables (specifically the power supply) o…

    the CD32's PSU is +5v/+12v/-12v definitely needs to hack the (DC) socket...
    the C64's PSU is +5v/9v-AC not suitable for any speccy.


    chris
    xc8 xc8 December 2009 Hardware
  • Alternative power supply for a +2B?Hi friends, On impulse, I recently bought a ZX Spectrum +2 (unit only, untested) on eBay, thinking that the cables (specifically the power supply) o…

    Hmmmm, I've found I also needed the +12V to get an RGB display on my +3 - my PSU had a bad connection on the 12V line, and every time it died, so did the display (although the rest of the computer - except the floppy drive - continued to work).
    Winston Winston December 2009 Hardware
  • Alternative power supply for a +2B?Hi friends, On impulse, I recently bought a ZX Spectrum +2 (unit only, untested) on eBay, thinking that the cables (specifically the power supply) o…

    Yes, -12v is also required to power the floppy drive. That's the reason for the -12v 700mA required in +3 power source (vs 200mA in +2A).

    Why not using a "hacked" PC power source?
    Zup Zup December 2009 Hardware
  • Trying to repair a 128K (heatsink)I've bought another ZX Spectrum 128K (heatsink model), but unfortunately the last owner did not tell me it did not work.... Because this Speccy also…

    Are the +12V and -12V and -5V present as well ?
    Pilsener Pilsener December 2009 Hardware
  • Alternative power supply for a +2B?Hi friends, On impulse, I recently bought a ZX Spectrum +2 (unit only, untested) on eBay, thinking that the cables (specifically the power supply) o…

    ... found I also needed the +12V to get an RGB display ... /> I can't see why 12V is really needed to form ... picture... unless your TV needs 12V from the RGB DIN socket ...
    mcleod_ideafix mcleod_ideafix 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
  • 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
  • I am currently watching.....This stems from a rant Mel did months ago on the currently listening to thread, and he suggested starting a thread like this to somebody (sorry can't…

    ... which caused a sensational, cacophonic ripple effect all through the many ...
    ZnorXman ZnorXman February 2010 Chit chat
  • 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
  • new member would like advice about MIAi have only joined today and i would like to know of a modern way of uploading data from cassette to pc or mac and then converting to tzx for MIA pre…

    ... =Chebyshev [1]
    r: set ripple (Chebyshev only) [1 dB]
    jp jp March 2010 MIA/STP/SDP
  • 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
<1…18192021222324…34>

Latest Posts

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