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Search Again :: Adv Search 1000 results in 0.004s
<1234567…34>
  • So you need to double (or triple, or quadruple) the clock speed...No particular reason for posting this, other than I was looking at an eZ80 evaluation board that does this, and that jogged my memory of a project I'…

    ... Spectrum's 3.5MHz clock.

    Clock *dividers* are easy, and ... bottom is the 4MHz reference clock.

    [img]http://spectrum ... as tidy as csmith's Harlequin :-) The chip on the top ... circuit which is the reference clock. (The two capacitors are ...
    Winston Winston June 2010 Hardware
  • populated Harlequin Rev.D -> Rev.FHi, I like to sell my Harlequin Rev. D board. I modified it to be identical to Rev. F: * switching regulator instead of linear regulator for DC in …

    ... /> I like to sell my Harlequin Rev. D board. I modified ... /> * correct hsync timing
    * correct clock phase at edge connector (Rev ...
    ingo ingo June 2014 Sales
  • Harlequin turbo mode ( 7 MHz )Hi, All. Sorry for my bad english. I make Harlequin mod - turbo mode ( CPU clock 7MHz ) for Harlequin. Could you be so kind to write your opin…

    ... /> I make Harlequin mod - turbo mode ( CPU clock 7MHz ) for Harlequin.
    Could ... schematic.
    I tested on Harlequin 128K.

    [img]http ... connector ) is inverting CPUCLK , but Harlequin has different schematic : CLKB is ...
    tetroid tetroid May 2016 Hardware
  • Harlequin ZX Spectrum Clone now 100% compatible!Hi all! The Harlequin ZX Spectrum clone now shows full timing compatibility with the ZX Spectrum! 8-) Both the ULA IO and memory contentions are fa…

    Hi all!
    The Harlequin ZX Spectrum clone now shows ...
    csmith csmith July 2007 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…

    ... and prototyping some up-coming Harlequin 'features' ;)

    Anyway, the ... device and not providing a clock swing that the CPU likes ...
    csmith csmith April 2008 Hardware
  • IN 255 behaviour not emulated in Spectaculator and ZXSpinI'm not speaking about "normal" IN 255 behaviour. All of you know what I'm taking about: IN 255 can be used to "read" screen data as it's retrieved f…

    ... the ULA stops the Z80 clock until it has finished. When ... and ZXSpin may follow the Harlequin design, so I assume this ... also happens with Harlequin. May Chris check this, please ...
    mcleod_ideafix mcleod_ideafix January 2009 Hardware
  • I've successfully created swf clockI was advancing by this tutorial : [url]http://forum.mobiles24.com/showthread.php?t=12361[/url] and I've created a theme with swf clock : [url]htt…

    ... created a theme with swf clock :

    [url]http://www ... title screen there appear digital clock with seconds.
    bohusk bohusk April 2009 Chit chat
  • VCF report and photosNot sure where to put this, exactly...but here it is, what went on at the Vintage Computing Festival at Bletchley Park last weekend. Finally I've fo…

    ... Smith's. He had the Harlequin, which as you may recall ... stand was very busy, the Harlequin drew a lot of interest ... still: a very early digital clock, built from relays and uniselectors ...
    Winston Winston June 2010 Sinclair Miscellaneous
  • 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…

    ... and project notes from the Harlequin... a Speccy fan in the ... designed a PCB for the Harlequin! (The Harlequin as you probably remember ... ://trastero.speccy.org/cosas/JL/Harlequin/superfo1.html[/url]

    Winston Winston January 2012 Hardware
  • Best current ide /flash interfaces? and re harlequin cloneHi I have a few 48k rubber-key spectrum's, a harlequin clone board :) on order and 1 (one) divide+ interface. I was hoping zetro's simple IDE woul…

    ... rubber-key spectrum's, a harlequin clone board :) on order and ... also fit / work on the harlequin clone? seeing as thats not ...
    iainjh iainjh February 2012 Hardware
  • Revisiting Spectrum CPU clock regenerationWarning: This post will be a bit nerdy :-) Some time ago, I experimented with phase locked loop circuits as a possible way to regenerate the Spectru…

    ... regenerate the Spectrum's clock signal despite contention. However ... produce the regenerated Spectrum clock, a stable and ... - one counting Spectrum clock cycles since contention started, ... and one counting regenerated clock cycles since contention started ...
    Winston Winston September 2012 Hardware
  • DivMMC clock bufferI have completed the first DivMMC EnJOY today: [url]http://www.worldofspectrum.org/forums/showthread.php?t=44238[/url] But there is a problem with t…

    ... is a problem with the clock boost circuit.

    Mario ...
    bverstee bverstee July 2013 Hardware
  • ZX Spectrum clock signals comparedI haven't searched for this on WoS; it might have been posted before. But I think it's important info, and can't do any harm to repeat or show from a…

    ... problems with the ZX Spectrum clock signal.
    With the ... this testing I tried another clock inverter solution from Ingo Truppel ... with the DivMMC with this clock inverter.


    ...
    This gives a perfect clock signal by default:

    bverstee bverstee September 2013 Hardware
  • 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…

    ... new BAS-ROM into his Harlequin there is the question, what ...
    HZJ HZJ April 2014 Development
  • 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] Please post your successes below :-) …

    ... of successful builds of the Harlequin.[/B][/U][/COLOR][/SIZE]
    1024MAK 1024MAK May 2014 Hardware
  • Harlequin - usefull mods and addsHello, I start here a thread regarding mods and adds for the Harlequin. It was found: * that the Sinclair Interface 1 does not fully work at the Ha…

    ... mods and adds for the Harlequin.

    It was found ... not fully work at the Harlequin.
    * that the Beta Disk ... ) does not work at the Harlequin.

    The reason is ... leads the -12V of the harlequin to the circuitry that needs ...
    ingo ingo May 2014 Hardware
  • ZX Spectrum Clock Signal Restorer Circuit[SIZE=5][U][B]ZX Spectrum Clock Signal Restorer Circuit[/B][/U][/SIZE] The circuit below is an experimental circuit. It has only been "tested" using…

    ... =5][U][B]ZX Spectrum Clock Signal Restorer Circuit[/B][/U ...
    1024MAK 1024MAK June 2014 Hardware
  • Harlequin case label concept?Hello everyone; I have been thinking about constructing a case for my Harlequin board. Nothing too outlandish; a sheet-metal case very close to the…

    ... constructing a case for my Harlequin board. Nothing too outlandish; a ... to have a Sinclair-style Harlequin label (in raised metal or ...
    Trafferth Trafferth August 2014 Sinclair Miscellaneous
  • My attempt to restore the CPU clock signalI know Winston has already got this, but I can't see any thread with details about it. Only wanted to share my (still early) results. I'm not taking…

    ... reshaping the ugly shaped clock signal available from the ... description of the simple clock restorer. It takes two ... wire mclk, // 28MHz input master clock
    input wire cpuclk_in_n, // ... 3.5MHz, clock stalled sometimes at low level ...
    mcleod_ideafix mcleod_ideafix September 2014 Hardware
  • Possibly daft Harlequin composite question... :SHi; My Harlequin Rev. F works fine apart from one aspect: there's no composite out... :( I have checked continuity and the discrete components. I.…

    Hi;

    My Harlequin Rev. F works fine apart ...
    Trafferth Trafferth September 2014 Hardware
  • Harlequin runningHi all, Just thought I'd post a wee pic of my Harlequin kit which I received yesterday and assembled in double quick time. A great piece of hardwar…

    ... a wee pic of my Harlequin kit which I received yesterday ... .com/images/stories/IanJ/ZXspectrummod/Harlequin.JPG[/IMG]
    IanJ IanJ October 2014 Hardware
  • Keyboard for ZX Spectrum 16k/48k or HarlequinThere is a keyboard developed originally for use with the Harlequin but maybe used as well with any 16k/48k ZX Spectrum. The keyboards offer a great …

    ... originally for use with the Harlequin but maybe used as well ...
    PokeMon PokeMon October 2014 Sales
  • a harlequin keyboard option (+2a)Hi guys. Finally got around to this, I am using a keyboard from a +2a connected to my harlequin. [IMG]https://farm4.staticflickr.com/3932/1560029…

    Hi guys.

    Finally got around to this, I am using a keyboard from a +2a connected to my harlequin.

    [IMG]https://farm4.staticflickr.com/3932/15600296661_323b6eee4d_k.jpg[/IMG]
    Lost Lost October 2014 Hardware
  • Harlequin keyboards / housingsI have about 20 or maybe more ZX Spectrum 48K's, which I'm planning to sell in separate parts (refurbished boards, ULA's and cases). Now I'm interes…

    ... /> Now I'm interested if Harlequin owners want a refurbished case ...
    bverstee bverstee November 2014 Sales
  • important Harlequin modWhile searching for a better solution for avoiding undesired spikes that corrupt the screen RAM at Harlequin I found a final solution. No additional …

    ... corrupt the screen RAM at Harlequin I found a final solution ... realize these mods at every Harlequin PCB.

    Greets Ingo ...
    ingo ingo November 2014 Hardware
  • where to find Harlequin rev. F all mods till now ?Hi all :) because no more broken speccys around for now, is time to build first of my Harlequin's rev F, I looking in forums and look at Ingo posts…

    ... to build first of my Harlequin's rev F,
    I ...
    gorski gorski July 2015 Hardware
  • SuperFo Harlequin crashes on EnterHello there, I currently have a SuperFo Harlequin at hand which suffers a crash/freeze each time I try to enter a line in basic. Doesn't matter if …

    ... /> I currently have a SuperFo Harlequin at hand which suffers a ...
    Shockwav3 Shockwav3 September 2015 Hardware
  • So, where exactly can I buy a Harlequin?I've looked far and wide but cannot seem to find where to buy one of the Harlequin based "clones". Even an unpopulated motherboard would be a start.…

    ... to buy one of the Harlequin based "clones". Even an unpopulated ... an NTSC user...has the Harlequin had much success on this ...
    cbmeeks cbmeeks October 2015 Hardware
<1234567…34>

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