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  • Got my mac mini and I'm in loveI have had it for about 2 days now and it is the 2nd best piece of computer equipment i have had, it is quieter then my dvd HD recorder i have been s…

    ... ) was due to capacitor plague - nearly every electrolytic capacitor on the motherboard ... this is due to the capacitor manufacturer cheaping out and stealing ... consumer electronics like TVs and video recorders.

    We also ...
    Winston Winston September 2007 Chit chat
  • Any '81 buffs?Does anybody know the running clock frequency of a Z80A in a ZX81? I've measured the clock signal on pin 6 and got 6.47MHz, and I'm sure it's not ju…

    ... ? You defeatist little... :)

    Replacement ZX81 ULAs can be acquired ... the clock signal pin. No video signal should be there as ...
    Phu Phu October 2007 Hardware
  • Speccy 128 QuestionMainly for the experienced speccy resurecters around these parts. Have you ever had a Speccy 128 with a borked TEA2000 video chip? The reason I ask…

    ...
    There is a variable capacitor in the 128k spectrum which ... this capacitor because the composite (and so UHF) video is ... improoved if this capacitor is absent. If ... you like to get an improoved composite video ...
    ingo ingo October 2007 Hardware
  • speccy plus keyboard helppicked up a really clean boxed speccy + with a ton of games for ?4 from the local recycle centre yesterday, woohoo :) Anyhow on testing it powers up …

    ... bottom) if you need a replacement membrane. They are quite easy ... to provide a clearer "composite video" output. This can then connect ...
    BloodBaz BloodBaz November 2007 Hardware
  • ULA RAS, CAS cycles, refresh and "snow effect"Hello everyone. I have a question, does anyone observed timings of RAS and CAS generated from ULA? I think there may be answer to where the "snow ef…

    ... it has given to the video memory.

    Hope that ... pulses....... So will my ULA replacement ;-) )

    Watch out for ...
    csmith csmith November 2007 Development
  • Pentagon floating bus timingI wanted to take a little break from working on the ZXDS UI yesterday, so I added support for Pentagon timing instead, so I can finally enjoy the lik…

    ... . An explanation how the ULA replacement fetches the bytes without any ... that it uses dual-ported video memory ? in which case, you ...
    zub zub November 2007 Emulators
  • Spectrum ULA replacement!Hi gang.. The Speccy 48 ULA Replacement is *almost* here ;) There has been lots of activity in building the CPLD board, sorting out some irritating…

    ... ]
    128K ULA has RGB video output and 48K ULA is ... YUV video output. If one 48k ULA replacement exist it ...
    Gods Gods April 2008 Hardware
  • Spectrum ULA replacement!Hi gang.. The Speccy 48 ULA Replacement is *almost* here ;) There has been lots of activity in building the CPLD board, sorting out some irritating…

    ... 259917]128K ULA has RGB video output and 48K ULA is ... YUV video output. If one 48k ULA replacement exist it ... ULA replacement will have a flying lead carrying composite video for ... be cheaper without the composite video converter of course ;-)
    < ...
    csmith csmith April 2008 Hardware
  • Spectrum ULA replacement!Hi gang.. The Speccy 48 ULA Replacement is *almost* here ;) There has been lots of activity in building the CPLD board, sorting out some irritating…

    ... the response to a ULA replacement, but could we have a ... who would want an ULA replacement?

    It is 100 ... , provides RGB and optionally Composite Video to drive the modulator, picture ...
    csmith csmith April 2008 Hardware
  • Composite output issuesHi, My speccy was bought with a composite mod but it's typically not stable. On an old TV it works fine but not on my Asus PW-201 monitor which has…

    ... , Sintech has them listed as "VIDEO Modulator"

    Search for ... , it has an extra 100uF capacitor. I've built Lloyd's ...
    gtsamour gtsamour April 2008 Hardware
  • True Spectrum laptop (no emulation)[url]http://user.tninet.se/~vjz762w/[/url] Hi All, I have build a speccy laptop, battery part is not ready yet.... I did it on 2 days, I will put s…

    ... 0.51A with the ULA replacement.

    So you're ... ULA replacement you can pretty much get rid of all the video ... line, without removing the ULA replacement prototype, which I'm not ... power usage of the ULA replacement, but that's probably a ...
    csmith csmith May 2008 Hardware
  • True Spectrum laptop (no emulation)[url]http://user.tninet.se/~vjz762w/[/url] Hi All, I have build a speccy laptop, battery part is not ready yet.... I did it on 2 days, I will put s…

    ... 0.51A with the ULA replacement.

    So you're ... ULA replacement you can pretty much get rid of all the video ... line, without removing the ULA replacement prototype, which I'm not ... power usage of the ULA replacement, but that's probably a ...
    Cookie Cookie May 2008 Hardware
  • ULA Replacement WORKS !Hi chaps. Lots of activity over the last couple of weeks, and _finally_ we have [B]a working ULA replacement[/B] !! The analogue components such …

    ... or whatever does the ULA replacement require?[/QUOTE]
    Currently about ... that down by simplifying the video sync back to the cheat ... finish prototyping/test the composite video driver and cassette IO interface ...
    csmith csmith July 2008 Hardware
  • +3 compositve video out problemToday, I've tried to put a composite video out in my +3. I've built the circuit proposed [url=http://www.secarica.ro/html/plus3_hardware.html#composi…

    ... of TR4 and ground, and video output is taken directly from ... your problem is the TV video input don't have one ... ) resistor or have one electrolic capacitor in the path.
    Gods Gods August 2008 Hardware
  • Sinclair PC 200 - RF questionIs there any compatibility regarding the RF output of the sinclair pc 200? This week i got my 2nd unit and in both of them, when connected through R…

    ... power supply of modulator or video circuitry.

    First see ... or video circuit is ok. Therefore you can add a big capacitor ...
    ingo ingo September 2008 Hardware
  • Sinclair PC 200 - RF questionIs there any compatibility regarding the RF output of the sinclair pc 200? This week i got my 2nd unit and in both of them, when connected through R…

    ... i get pal composite video straight from the video out signal?[/QUOTE ... of R922 R924, place a capacitor in series(some µF, for ... exmaple a 22µF electrolytic capacitor) to avoid signal limitting - do ...
    ingo ingo September 2008 Hardware
  • PAL-I to PAL-B on a grey +2Hello. A friend brought over a grey +2 from the UK. The tv sets over here are PAL B/G and i can't tune the sound because of the frequency of the sou…

    ... one 15pF (or 22pF) ceramic capacitor between mc1376 pin7 and GND ... = Pin1 you can place the capacitor between pin 7 and pin ... of the +2 from its video plug.

    Ingo ...
    ingo ingo December 2008 Hardware
  • 4116 DRAM for 48KSomeone told me I got faulty RAM in my broken 48K. They should be 150ns, right? What would be a good place to buy them from?

    ... used, but only in the video circuitry. In there, exact voltage ... DRAMs are used (eg. as video memory for a TMS9918 chip ... small PCB as plug-in replacement
    RetroTechie RetroTechie December 2008 Hardware
  • Timex 1000 PAL conversionHi, a friend of mine sent me a Timex 1000 from the US. I was prepared for the NTSC/PAL issues so no surprise came to me when i got a shadowy dark scr…

    ... additional transistor (BC547) and the video input of the TV set ... before or after the 100uF capacitor (it should make no difference ... of black notch in the video signal.

    The resistor ...
    ingo ingo January 2009 Hardware
  • 128k heat sink - ULA problems and a hintHello, I had two ZX Spectrum 128k with a similar behaviour. One item worked only a short time after switching on and then there were increasing RAM …

    ... divIDE is not connected
    [*]Video is solid (does vary a ... board may be a good replacement for the 7805 if you ...
    BloodBaz BloodBaz January 2009 Hardware
  • Recommend Monitor for Speccy +2Just bought a speccy +2 to play on in my studio on downtime, can anyone recommend a good RGB monitor for it?? as the TV signal is a bit migrane indu…

    ... has VGA in, composite, S-Video, UHF and SCART inputs. It ... starting to look for a replacement.
    What possibilities would it ...
    thomas3120 thomas3120 February 2009 Hardware
  • issue 2 board c34 getting hotHi All, Can anyone help with c34 getting hot very quickly? I`ve got an issue 2 board, there is no `buzz` from coil. yet the spectrum initalises to co…

    No the capacitor i`ve used as a replacement is a brand new ... is no reason for the capacitor overheating/overloading.
    adekav adekav March 2009 Hardware
  • Awful image on 128K +2B / CV mod not workingHello, My two +2 B output a terrible image through RF. Lots of shadows and moir&#233; patterns. One is slightly better than the other, but really ba…

    ... just to tell me the capacitor number. I have done the ... time to fix the composite video output on the +2. Thanks ...
    memrah memrah March 2009 Hardware
  • Real 60Hz NTSC 48K ZX SpectrumNot a 3rd party mod. The joystick mod was added by the user, but the board and the computer is exactly what was sold in Chile, South America. We migh…

    ... a PAL Speccy with composite video into a NTSC and a ... 60Hz) and added a eletrolitic capacitor 100uF x 16V(the positive ...
    Fred Fred April 2009 Hardware
  • TV output from original +2I've modified my 48K Spectrum to output composite, and I have it working here in Japan on my old monitor (X68000). Hopefully my parents will bring ov…

    ... way to eliminate it: locate capacitor C24 in your Spectrum PCB ... capacitor) and remove it. This is the responsible of mixing the video ... 75 ohm resistor, and a capacitor.
    mcleod_ideafix mcleod_ideafix September 2009 Hardware
  • TV output from original +2I've modified my 48K Spectrum to output composite, and I have it working here in Japan on my old monitor (X68000). Hopefully my parents will bring ov…

    ... way to eliminate it: locate capacitor C24 in your Spectrum PCB ... capacitor) and remove it. This is the responsible of mixing the video ... always had noise on the video signal (and elsewhere on the ...
    guesser guesser September 2009 Hardware
  • RBG monitor for Spectrum?I'm using a very old TTL RGB monitor with my Spectrum, with a RGB adapter that I made many years for my Sinclair QL. It works perfectly with my QL, b…

    ... hex inverter with a decoupling capacitor on the power for the ... 's inverting one of the video signals. It works perfectly with ... my QL, and the video is rock solid, with no ...
    KatManDEW KatManDEW September 2009 Hardware
  • Dead 48K Speccy.Blow this up as a child... thought I'd get it down from the loft and see if I can repair it. Upon power up, it displays this: [IMG]http://i266.photo…

    ... />
    I assume no composite video mod (like [URL="http://womblesretrorepairshack ... video encoder IC (LM1889, very common - should be easy to find replacement ... ), or an ULA with damaged video output(s ...
    RetroTechie RetroTechie September 2009 Hardware
  • Dead 48K Speccy.Blow this up as a child... thought I'd get it down from the loft and see if I can repair it. Upon power up, it displays this: [IMG]http://i266.photo…

    ... /> [QUOTE]I assume no composite video mod (like [URL="http://womblesretrorepairshack ... video encoder IC (LM1889, very common - should be easy to find replacement ... ), or an ULA with damaged video output(s ...
    cycyc cycyc September 2009 Hardware
  • I bought my first ZX Spectrum 48k, now what ?Hi guys ! I recently go to Brussel in Belgium and found a ZX Spectrum at a "flea market" (sorry, I don't the correct word for that, let's call it a …

    ... quality.[/QUOTE]
    The composite video signal already goes through a ... output for use as composite video signal), without problems. The modder ... the modulator case). Sometimes a capacitor is added (to remove DC ...
    RetroTechie RetroTechie September 2009 Hardware
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