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<1234567…34>
  • Subacuatic (ZX Spectrum 128k) - MojonTwinsFerdinand W. Templeton is the referential archeologist at the University of Michigan. His important discoveries in such exotic places as Egypt, Phili…

    ... takes advantage of the modified ULA present in the Harlequin clone and implemented ... load the game in a ULA-modified Harlequin (when this is possible in ...
    jf_jara jf_jara November 2009 Games
  • Sgt. Helmet Zero - The Mojon Twins (Spectrum 128k)Hi! this is our first christmas present! :lol: [size=150]Sgt. Helmet Zero[/size] [img]http://www.mojontwins.com/wp-content/uploads/2009/12/09.gif[/…

    ... takes advantage of the modified ULA present in the Harlequin clone and implemented ... load the game in a ULA-modified Harlequin (when this is possible in ...
    anjuel anjuel December 2009 Games
  • Punch up! Bruce Everiss mauled by the internet over why Imagine collapsed.I couldn't see this posted here so I thought I would post it. It kept me amused for at least half an hour. Bruce Everiss on his blog claims piracy br…

    ... Spectrum screens thanks to a modified ULA.

    I'm sure ...
    Matt_B Matt_B April 2008 Sinclair Miscellaneous
  • Pussy - on sale againNo, it is nothing sick, it is just: european users can now buy "Pussy-the Titanic love story" on my homepage [url]http://lcd-one.da.ru[/url] again (p…

    ... with Gigascreen Mod has a modified ULA clone which is able to ...
    LCD LCD October 2008 Announcements
  • what were the things the Speccy architecture was good for?I don't know a hell of a lot about all the different computers hardware and I wanted to know if the way the Spectrum was built lent itself to certain…

    ... a CPLD ULA with uncontended screen memory, based on the Harlequin CPLD ULA...
    Winston Winston November 2008 Sinclair Miscellaneous
  • More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.

    [QUOTE=zxbruno;397362]The program runs well on the latest version of Spin. Really, really nice. :)[/QUOTE]

    Is that the 0.7 one ? I cannot seem to get it to work... always says that it requires the new modified ULA...
    Tom-Cat Tom-Cat November 2009 Emulators
  • More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.

    ... that it requires the new modified ULA...[/QUOTE]

    the 64 ...
    guesser guesser November 2009 Emulators
  • More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.

    [QUOTE=zxbruno;397482]Yes. the Harlequin will support this mode 100% ... ;-)
    1. ULA Book
    2. Harlequin
    3. ULA replacement (plus)
    csmith csmith November 2009 Emulators
  • More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.

    ... in electronics - ie the Harlequin or ULA replacement, which palette provides the ...
    csmith csmith November 2009 Emulators
  • More colours II (Was: Most popular new features?)The suggested 4xCLUT multi-colour solution never took off.

    ... in electronics - ie the Harlequin or ULA replacement, which palette provides the ...
    Dunny Dunny November 2009 Emulators
  • Official CSSCGC 2011 Competition ThreadHello fellas. The site is up and running. We are already accepting submissions. [url]http://www.mojontwins.com/csscgc2011/[/url] Rules, info, and e…

    ... chip (known as ULA) by overwritting the ULA BIOS through some ... of replacing the Spectrum ULA with a modified ULA that incorpores the AAF2 ... are in fact enabling the ULA BIOS overwritting via software ... that if you use your modified ULA in combination with the ...
    apenao apenao February 2011 Games
  • 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…

    Miguel is currently taking the Harlequin, and ULA details from the book and ... PCB and hopefully the real ULA.

    Doing it ... a go at reproducing basic ula cells with transistors, so perhaps ... a transistor-only ula next?

    Me, ...
    csmith csmith April 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…

    ... ]Miguel is currently taking the Harlequin, and ULA details from the book ... a go at reproducing basic ula cells with transistors, so perhaps ... IC is unavailable (like the ULA).
    3. The technology ... PCBs connected). The Series 6 ULA more affordable but has no ...
    antoniovillena antoniovillena April 2012 Hardware
  • Outrun Europa in colourSwainy suggested that he'd like to try his luck with Outrun Europa colorful graphics and see if they can be improved. Let's give him the chance :) A…

    ... go online and purchase a Harlequin with ULA+ support and I'm ... replace the original Speccy ULA with the ULA+. The next step would ... the menu to choose between ULA or ULA+ colour modes.

    More support for the ULA+! Once it becomes the standard ...
    zxbruno zxbruno May 2012 Development
  • Significant machines by yearI'd roughly divide Spectrum's hardware history into four periods: Sinclair (1980 to 1985), Amstrad (1986 to 1988 ), Russian (1989 to 1996) and Homebr…

    1984 should be also for Timex TC2048, at least in Portugal and Poland.
    And 1985 - Elwro 800 Junior, probably first Harlequin version (ULA built from TTL chips).
    kpuchatek kpuchatek October 2013 Hardware
  • Significant machines by yearI'd roughly divide Spectrum's hardware history into four periods: Sinclair (1980 to 1985), Amstrad (1986 to 1988 ), Russian (1989 to 1996) and Homebr…

    ... 800 Junior, probably first Harlequin version (ULA built from TTL chips).[/QUOTE ...
    skagon skagon October 2013 Hardware
  • DivIDEMy experience with DivIDE over a period of 3 years has been far from happy. DivIDE successfully runs about 20% of files on my +2a and many files e…

    ... before 1987 due to a modified ULA. You might want to take ...
    Alessandro Grussu Alessandro Grussu July 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 ... ! 8-)

    Both the ULA IO and memory contentions are ...
    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…

    ... gang..
    The Speccy 48 ULA Replacement is *almost* here ;)
    Harlequin 'features' ;)

    Anyway, the machine with ULA replacement ...
    csmith csmith April 2008 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…

    ... designed a PCB for the Harlequin! (The Harlequin as you probably remember ... the basis for understanding the ULA, and all the timing quirks ... of the Spectrum ULA, and the later work Chris ... Smith did to produce the ULA book).

    Some ...
    Winston Winston January 2012 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 …

    ... to sell my Harlequin Rev. D board. I modified it to be ...
    ingo ingo June 2014 Sales
  • 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…

    ... , ULA's and cases).

    Now I'm interested if Harlequin ...
    bverstee bverstee November 2014 Sales
  • Looking for advice on building a HarlequinNew member here. From the US. My first computer was a Timex Sinclair 1000 back in the early 80s (in fact, I got one of the first batches sold in th…

    ... 'm wanting to build a Harlequin. I've got a Rev ... .

    Looking at this Harlequin schematic, it just screams out ... 've purchased Chris Smith's ULA book and am anxious to ... on the case for the Harlequin.

    Thanks ...
    msansom msansom February 2017 Hardware
  • Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…

    ... IRQ 3 states later after ULA pulls INTREQ low. I ... earliest 1 cycle after the ULA pulled it low. But ... Is this perhaps what your modified ulatest3 does? Somehow I ... "]this one[/URL] on Harlequin? It's quite time ... work you have done on Harlequin. I just think that ...
    Patrik Rak Patrik Rak September 2007 Emulators
  • 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…

    Would you agree that the Harlequin, which has same dimensions and ... board for defective Spectrums. The Harlequin is not a complete clone ... ?
    Otherwise some Spectrums are modified a lot so that there ... well as to replace the ULA chip, which is not in ...
    ingo ingo April 2014 Development
  • Ben Heck modifies a Zee X Spectrum.Gahh, one of the differences between Americans and Europeans right there in the title. Anyway, we know better ;) ...and this isn't about that anyway.…

    ... but not the original - The harlequin is certainly a clone - ... that it's the ULA that makes it a ... the specific behaviour of the ULA)

    Considering ... he's transplanted the ULA I don't really ... . It's a (heavily) modified spectrum. When you watch the ...
    guesser guesser August 2014 Hardware
  • ZX Spectrum upper RAM module (4532/4164 replacement)Following the [URL="http://zx.zigg.net/LRR/"]lower RAM replacement module[/URL], there have been quite a lot of requests for something similar for th…

    ... HCT family

    ROM, ULA and LM1889N are the only ... />
    My modified Speccy at rest: 190mA

    Harlequin Rev F ...
    balford balford October 2014 Sales
  • WANTED: 128k+ or 128k +2(early grey mod.) ULA chipHello, Attempting to repair my 128k+ speccy. Needs a ULA(IC1)chip from either a 128k+ or an early +2 will work also. If anyone has this chip or has a…

    ... 128k+ speccy.
    Needs a ULA(IC1)chip from either a ... 's broken(other than the ULA), please give me a shout ...
    thomas3120 thomas3120 January 2003 Wanted
  • InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…

    ... * How long does the 48K ULA hold /INT low?
    ... is generated by the ULA every 69888 tstates, which ... an interrupt occurs, the ULA pulls the /INT pin ... M3: 3 tstates: write the modified value back to (HL).
    ULA has pulled /INT high ...
    Philip Kendall Philip Kendall July 2004 Development
  • ULA schematicsHi everyone. Some while ago I remember getting hold of some circuit schematics of the innards of the Speccy 48K ULA. Sadly I've since lost the files…

    ... innards of the Speccy 48K ULA. Sadly I've since lost ...
    Laser Laser August 2005 Sinclair Miscellaneous
<1234567…34>

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