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<1…24252627282930…34>
  • Keyboard has a life of its own?I just received a Spectrum+ Issue 4S, where I had to replace the MIC connector and I also did the Composite mod. So far it works just fine, but when …

    ... be that a resistor or diode has gone faulty. Are the ...
    1024MAK 1024MAK August 2013 Hardware
  • Keyboard has a life of its own?I just received a Spectrum+ Issue 4S, where I had to replace the MIC connector and I also did the Composite mod. So far it works just fine, but when …

    ... R69.

    Using the diode test range (or low resistance ... 't have a diode test range) test each diode D1 to D8 ...
    1024MAK 1024MAK August 2013 Hardware
  • Homebrew keyboardGuys, just a quick question. I really should know, but I don't :( I've built keyboards for the standard layout before now, and was hoping to expand…

    I never thought of that! It's a possibility, and would solve the diode drop issue - assuming there is one,

    It won't help with the timing issue though, Symbol shift first, then the P key - again, assuing there would be a timing issue.....
    DEATH DEATH August 2013 Hardware
  • Homebrew keyboardGuys, just a quick question. I really should know, but I don't :( I've built keyboards for the standard layout before now, and was hoping to expand…

    ... , so I can put a diode in the P key line ...
    DEATH DEATH August 2013 Hardware
  • Homebrew keyboardGuys, just a quick question. I really should know, but I don't :( I've built keyboards for the standard layout before now, and was hoping to expand…

    ... "unshifted" keys. Use a fast diode for the shift and a ... slow diode for the "unshifted" key.
    1024MAK 1024MAK August 2013 Hardware
  • Keyboard has a life of its own?I just received a Spectrum+ Issue 4S, where I had to replace the MIC connector and I also did the Composite mod. So far it works just fine, but when …

    ... higher deviation indicates a faulty diode?

    Hard to spot ...
    schombi schombi August 2013 Hardware
  • DivMMC EnJOY!Coming up... [IMG]http://benophetinternet.nl/hobby/vanmezelf/DivMMC_enjoy_first_render.jpg[/IMG]

    Ben

    If the ROM on the Speccy is not responding to a 2.7V logic high signal, you could try this little mod.:-

    [CODE]

    ----+--------+--- +5V
    | |
    -+- ...
    1024MAK 1024MAK August 2013 Hardware
  • DivMMC EnJOY!Coming up... [IMG]http://benophetinternet.nl/hobby/vanmezelf/DivMMC_enjoy_first_render.jpg[/IMG]

    [QUOTE=1024MAK;715858]Ben

    If the ROM on the Speccy is not responding to a 2.7V logic high signal, you could try this little mod.:-

    [CODE]

    ----+--------+--- +5V
    | |
    bverstee bverstee August 2013 Hardware
  • ZX Spectrum Pre-regulator DesignCarrying on from the "[URL="http://www.worldofspectrum.org/forums/showthread.php?t=44486"]Issue 2 crashes after about 30 mins[/URL]" thread... [QUOT…

    ... lower) and use a 1N5822 diode. This will therefore work for ...
    1024MAK 1024MAK August 2013 Hardware
  • Homebrew keyboardGuys, just a quick question. I really should know, but I don't :( I've built keyboards for the standard layout before now, and was hoping to expand…

    ... .
    I didnt find the diode voltage drop was a significant ...
    spodula spodula August 2013 Hardware
  • Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…

    ... is a revision F of harlequin ready for making new PCBs ... for a new lot of harlequin. If anybody is interested to ...
    ingo ingo August 2013 Hardware
  • Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…

    [U][B]Harlequin rev. F is ready - new ... is a revision F of harlequin ready for making new PCBs ... for a new lot of harlequin. If anybody is interested to ...
    1024MAK 1024MAK August 2013 Hardware
  • Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…

    [QUOTE=ingo;716845]
    I collect orders from german users to get cheap PCBs and probably to buy parts for a new lot of harlequin. .[/QUOTE]

    I'd like to register interest for a PCB and the parts. (I may actually want two sets).
    Winston Winston August 2013 Hardware
  • Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…

    ... is a revision F of harlequin ready for making new PCBs ... for a new lot of harlequin. If anybody is interested to ...
    flopping flopping August 2013 Hardware
  • ZX spectrum 128K + 2 (Grey one :)Hi all, I'm trying to revive a dead ZX 128K +2 (the grey one). The regulator was damaged and seemed to be feeding 7.8Volts onto the pcb. Yikes ! I…

    ... /> Ohm/Volts Meter with tr/diode testing also
    Oscilloscope - dual ...
    DenisM DenisM August 2013 Hardware
  • Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…

    ... is progress here with this harlequin clone. What is the specs ...
    Johan1973 Johan1973 August 2013 Hardware
  • Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…

    ... br />
    this harlequin is a 48k Spectrum clone ... /HC logic ICs the harlequin needs only 200 mA ... !
    Video output of harlequin is RGB (!) and composite ... ear input of the harlequin to get sound signal ... The first batch of harlequin seem to be very stable ...
    ingo ingo August 2013 Hardware
  • Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…

    ... get svideo output from this harlequin then as well :)
    I ...
    Johan1973 Johan1973 August 2013 Hardware
  • ZX spectrum 128K + 2 (Grey one :)Hi all, I'm trying to revive a dead ZX 128K +2 (the grey one). The regulator was damaged and seemed to be feeding 7.8Volts onto the pcb. Yikes ! I…

    ... this AC waveform through to diode D20 and on to C41 ...
    1024MAK 1024MAK August 2013 Hardware
  • Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…

    ... ://trastero.speccy.org/cosas/JL/Harlequin/superfo1.html[/url]

    Jose_Leandro Jose_Leandro August 2013 Hardware
  • Repairing a torn trace on an Issue 2 PCBI've found what I think could be the reason for my Issue 2 board not working properly... There is a torn PCB trace beneath one end of where a new ULA…

    ... a new fuse and zener diode for the Denon.
    Simon_Carr Simon_Carr August 2013 Hardware
  • Border art viewerRecently, we were working with diver/4d on border art. The idea was to push the techniques of drawing on the border to the limit and to see, how much…

    ... /border_art_mercen3_plus2a.jpg[/img]

    Harlequin clone [B]NOT OK[/B ...
    mcleod_ideafix mcleod_ideafix August 2013 Development
  • Border art viewerRecently, we were working with diver/4d on border art. The idea was to push the techniques of drawing on the border to the limit and to see, how much…

    Recall that the Harlequin has one small design flaw: the border colour is updated from the border latch on every pixel clock, instead of every 8 pixel clocks. I wonder if that might affect the observed results.
    mcleod_ideafix mcleod_ideafix August 2013 Development
  • Border art viewerRecently, we were working with diver/4d on border art. The idea was to push the techniques of drawing on the border to the limit and to see, how much…

    ... right either.

    [B]Harlequin clone NOT OK (timmings ok ...
    introspec introspec August 2013 Development
  • Border art viewerRecently, we were working with diver/4d on border art. The idea was to push the techniques of drawing on the border to the limit and to see, how much…

    ... =mcleod_ideafix;719073]Recall that the Harlequin has one small design flaw ... be able to reliably detect Harlequin.

    Actually, I would ...
    introspec introspec August 2013 Development
  • Border art viewerRecently, we were working with diver/4d on border art. The idea was to push the techniques of drawing on the border to the limit and to see, how much…

    [QUOTE=introspec;719074][B]Harlequin clone NOT OK (timmings ok, ...
    mcleod_ideafix mcleod_ideafix August 2013 Development
  • Border art viewerRecently, we were working with diver/4d on border art. The idea was to push the techniques of drawing on the border to the limit and to see, how much…

    ... dawn right! :-o

    Harlequin clone with NMOS Z80. [B ...
    mcleod_ideafix mcleod_ideafix August 2013 Development
  • Border art viewerRecently, we were working with diver/4d on border art. The idea was to push the techniques of drawing on the border to the limit and to see, how much…

    [QUOTE=mcleod_ideafix;719088]Harlequin clone with NMOS Z80. [B]OK[/B][/QUOTE]
    And, by the way, it is not really OK - the border image is shifted by two pixels - usually I only needed to take care of this on Pentagons.
    introspec introspec August 2013 Development
  • Border art viewerRecently, we were working with diver/4d on border art. The idea was to push the techniques of drawing on the border to the limit and to see, how much…

    ... read quite a lot about Harlequin and always thought that the ...
    introspec introspec August 2013 Development
  • Border art viewerRecently, we were working with diver/4d on border art. The idea was to push the techniques of drawing on the border to the limit and to see, how much…

    ... read quite a lot about Harlequin and always thought that the ... ]
    That's true. The Harlequin was meant to show how ... . On the other way, the Harlequin has nothing to do with ...
    mcleod_ideafix mcleod_ideafix August 2013 Development
<1…24252627282930…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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  • BA157 diodeUsed in Speccies, so not too off topic :P<br /> <br /> Right, it's a "fast recovery rectifier diode" - can anybody tell me what that means exactly? …
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  • Can a Spectrum make a Harlequin?I've seen this before, but it's still a bit confusing. Are they really printing circuit boards and a Speccy controls the whole thing? :)<br /> <br />…
  • Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…
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  • BAS-ROM for HarlequinSince it is very easy for everybody to plug a new BAS-ROM into his Harlequin there is the question, what kind of ROM and what additional functions sh…
  • A tally on the number of successful builds of the Harlequin[SIZE=4][COLOR=Green][U][B]A tally on the number of successful builds of the Harlequin.[/B][/U][/COLOR][/SIZE]<br /> <br /> Please post your successe…
  • Harlequin - usefull mods and addsHello,<br /> <br /> I start here a thread regarding mods and adds for the Harlequin.<br /> <br /> It was found:<br /> * that the Sinclair Interface 1…
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