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<1…20212223242526…34>
  • Using a Spectrum Plus 2 Gray in the USBelieve the gray has what's called a SCART video output, so would something like [URL="http://www.amazon.co.uk/EasyCAP-Video-Audio-Capture-Card/dp/B0…

    ... - A/V output
    2 - polarity is reversed (it?s an ...
    Turrican Turrican February 2012 Hardware
  • ZX Spectrum 128K composite video fixes in 1 documentI just finished my document with video fixes and improvements for all ZX Spectrum 128K models. Download it here: [URL="http://benophetinternet.nl/ho…

    ... has to be from the diode chain onwards.

    [img ...
    guesser guesser February 2012 Hardware
  • Occasional noise over RGB on +2AHi all I have a +2A that is misbehaving at the moment. I'm using the RGB to SCART lead (which incedentally is great on my +3) The problem is, the …

    ... recently both have a resistor/diode circuit to create an analogue ...
    Zorn Zorn February 2012 Hardware
  • 128k Toastrack repair advice needed..Hey all, Just got my second toast rack in a oddball deal when i visited a local farmer for some other second hand stuff. The 128 was sitting in a p…

    ... , and with it set to diode mode, it measure a drop ...
    Asure Asure March 2012 Hardware
  • 4116 SRAM replacement (and ULA timings).As mentioned in another thread, I have spent quite a lot of time experimenting with different circuits and components for using a static RAM IC to re…

    ... inverter.png[/IMG]

    Diode D1 is commonly used in ... that a typical small silicon diode here made almost no difference ... and a Schottky diode prevented the transistor the from ... did not work properly. This diode is probably best omitted, but ...
    Zorn Zorn March 2012 Hardware
  • 4116 SRAM replacement (and ULA timings).As mentioned in another thread, I have spent quite a lot of time experimenting with different circuits and components for using a static RAM IC to re…

    ... , but a bit of resistor-diode logic to only let /WE ...
    Zorn Zorn March 2012 Hardware
  • Issue 3B only sees 16k (and RAMTOP NO GOOD on loading)A ZX+ with issue 3B board that i got recently, does not see anything more than 32768 (sometimes 37267..) on "PRINT PEEK 23732 + PEEK 23733 * 256 (Ent…

    ... follows (for UK toastracks): remove diode D34 (you actually need to ... lift the cathode of this diode). With a piece of wire ...
    mcleod_ideafix mcleod_ideafix March 2012 Hardware
  • Power adaptor for a Sinclair 128kHi, just a quick question. Would a 48k spectrum+ power lead work for a 128k Sinclair Speccy, I have both but the power does not work on the 128k, I n…

    ... ][/B] you must change the polarity of the connector so that ...
    Zetr0 Zetr0 March 2012 Hardware
  • Keyboard rebuild in the Plus modelNo extended keys implemented. You need 2 switches for each extended key, or a DPST switch and the wiring is more complex. It has a lot of work, but i…

    Why can I never find the matrix diagram for the second membrane in the + keyboard when I want it grr.

    Something in the back of my mind says it's easy to add the extra keys using normal buttons and diode logic.
    guesser guesser March 2012 Hardware
  • Keyboard rebuild in the Plus modelNo extended keys implemented. You need 2 switches for each extended key, or a DPST switch and the wiring is more complex. It has a lot of work, but i…

    ... keys using normal buttons and diode logic.[/QUOTE]

    Fantastic ... must do the circuit with diode logic, I can complete the ...
    antoniovillena antoniovillena March 2012 Hardware
  • Keyboard rebuild in the Plus modelNo extended keys implemented. You need 2 switches for each extended key, or a DPST switch and the wiring is more complex. It has a lot of work, but i…

    ... must do the circuit with diode logic, I can complete the ... keys can be done with Diode logic, but most of them ... that can be done with diode logic are:

    Edit ...
    spodula spodula March 2012 Hardware
  • Modulator oddness - previous owner's mod?Hello, just bought a rubber key 48k Issue 3 I'm trying to fix up. I'm wanting to do a composite video out mod ( n00b at this) but the "spare" hole in…

    ... tested OK, turned out that diode D9 was blown - maximum resistance ...
    beelzebubbles beelzebubbles May 2012 Hardware
  • The new Superfo cloneHi In the spanish forum speccy.org some guys and me have optimized the superfo clon to have less ICs. The actual design has 39 ICs versus the 45 ICs…

    ... you do the decode with diode logic).
    antoniovillena antoniovillena May 2012 Hardware
  • The new Superfo cloneHi In the spanish forum speccy.org some guys and me have optimized the superfo clon to have less ICs. The actual design has 39 ICs versus the 45 ICs…

    ... you do the decode with diode logic).[/QUOTE]

    good ...
    BiNMaN BiNMaN May 2012 Hardware
  • Technical (or pseudo technical) Terms that have Jumped The SharkTitle says it all: Information super highway, Multi-media, Surfing the web,

    "Reverse the polarity of the neutron flow".
    joefish joefish May 2012 Chit chat
  • Intermittent sound cutting outHello, I'm resurrecting an old rubber key spectrum. Originally it had no sound at all, diode D9 was blown, I replaced it with one from my other dead …

    ... it is normal because diode has forward drop voltage and ... measuring to fully open the diode.
    Look at the ... A/V curve for a diode:

    [url] ... /wikipedia/commons/a/a5/Diode-IV-Curve.svg[/url]< ... />
    So, any real diode has some voltage drop and ...
    ArtemKuchin ArtemKuchin May 2012 Hardware
  • Intermittent sound cutting outHello, I'm resurrecting an old rubber key spectrum. Originally it had no sound at all, diode D9 was blown, I replaced it with one from my other dead …

    Several multimeters have the posibility to measure Vd directly. That is what the 'diode' position of the big switch is for.
    roko roko May 2012 Hardware
  • Repairing Spectrum PSUHi everybody, In my ever-growing collection of Spectrum PSUs, I have an ever-growing sub-collection of dead Spectrum PSUs. Some of these can be rep…

    ... in a bridge configuration each diode only conducts 1/2 the ...
    RetroTechie RetroTechie May 2012 Hardware
  • Spectrum+ PSUWould even consider a broken one for a reasonable price.:-o

    ... take extremely care for the polarity.
    Mad Fritz Mad Fritz May 2012 Wanted
  • Spectrum+ PSUWould even consider a broken one for a reasonable price.:-o

    ... take extremely care for the polarity.[/QUOTE]

    I just ...
    napoleonblownaparte napoleonblownaparte May 2012 Wanted
  • PZX on WOS ?Is the PZX format accepted on WOS, at least for new production ? (Sorry, if this is wrong section, it looks to me as most suitable for the question.)

    [QUOTE=Andrew Barker;629196]To cut a long story short no. Nor is TZX v1.20.
    Don't get me wrong, PZX is a good viable format, but what would you want to store in the format that TZX can't do ?[/QUOTE]

    Polarity. If memory serves.
    chev chev May 2012 MIA/STP/SDP
  • PZX on WOS ?Is the PZX format accepted on WOS, at least for new production ? (Sorry, if this is wrong section, it looks to me as most suitable for the question.)

    ... ) anywhere?

    Surely if polarity is not supported in TZX ... (to set, reset or toggle polarity at any given point in ... tape)? I didn't think polarity was something that affected the ... a tape that reverses/toggles polarity.

    Roger and out ...
    BloodBaz BloodBaz May 2012 MIA/STP/SDP
  • PZX on WOS ?Is the PZX format accepted on WOS, at least for new production ? (Sorry, if this is wrong section, it looks to me as most suitable for the question.)

    ... )? I didn't think polarity was something that affected the ... a tape that reverses/toggles polarity.
    [/QUOTE]

    ... The most common case with polarity is not change it between ... blocks, but some loaders are polarity sensitive ([i]Basil, The Great ...
    zx81 zx81 May 2012 MIA/STP/SDP
  • PZX on WOS ?Is the PZX format accepted on WOS, at least for new production ? (Sorry, if this is wrong section, it looks to me as most suitable for the question.)

    ... />
    [QUOTE]
    Surely if polarity is not supported in TZX ...
    catmeows catmeows May 2012 MIA/STP/SDP
  • Zx 48k after the ic7805 other problemHi everyone, i am Tiago from Portugal, and i am trying to repair a Zx Spectrum 48K. the machine didn't do anything, no image, no sound, nothing. The…

    ... both and test them (the diode test function of a DMM ...
    Zorn Zorn May 2012 Hardware
  • Zx 48k after the ic7805 other problemHi everyone, i am Tiago from Portugal, and i am trying to repair a Zx Spectrum 48K. the machine didn't do anything, no image, no sound, nothing. The…

    ... ?
    2) what is "the diode test function of a DMM ...
    tiago tiago June 2012 Hardware
  • Replacing coil with other component?The purpose of the coil transformer, from what I gather in the schematics of the issue 2 spectrum, is to create 5V from about 9-10V. Would it not be …

    ... well throw in a fresh diode there. Did that, and voila ... . Have never experienced that a diode checks out on meter and ...
    Johan1973 Johan1973 June 2012 Hardware
  • ISO-Copy - Individual Software revisitedHi folks In another thread about Supertape: [url]http://www.worldofspectrum.org/forums/showthread.php?t=36203[/url] ... we touched on ISO-Copy by th…

    ... looking at the clicks pulses polarity (high, then low), markers will ...
    jlsoler jlsoler June 2012 MIA/STP/SDP
  • DIVIDE 2k11hello, just short link - for Your info (cpld, 4 layers, rohs, cpld code for future development for clones..) [url]http://lotharek.pl/product.php?…

    ... ]
    How to repair a diode.... That's not the point ...
    roko roko June 2012 Hardware
  • ISO-Copy - Individual Software revisitedHi folks In another thread about Supertape: [url]http://www.worldofspectrum.org/forums/showthread.php?t=36203[/url] ... we touched on ISO-Copy by th…

    ... should be careful with signals polarity and to do a sweet ...
    jlsoler jlsoler June 2012 MIA/STP/SDP
<1…20212223242526…34>

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