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  • Games that use multicolour effectsMulticolour (which created via ula timing, not screen switching) is the only functional effect that ULA can do. It's the only way to break colour cla…

    Multicolour (which created via ula timing, not screen switching) is ... the only functional effect that ULA can do. It's the ...
    Arda Arda October 2006 Games
  • Anybody play RPGs?Did anybody play RPGs in their younger years? I used to play Dungeoneer (the RPG based on the Fighting Fantasy gamebooks. with an added on skill sys…

    ... to flick through in the heat of the action.

    BigBadMick BigBadMick November 2006 Chit chat
  • Multiface 128 problemHello everyone i have a 48k plus speccy which i firstly thought was working perfectly. It passed all the test of the official Sinclair test tape (cpu…

    ... Sinclair test tape (cpu, rom, ula, ram) so i thought it ...
    gtsamour gtsamour November 2006 Hardware
  • 128k Page FlippingOver on adverts, AOwen wrote the following: [quote=aowen]The trick, as I understand it, is to redraw the whole screen each time at #c000, but point…

    ... at #c000, but point the ULA away from the screen you ... /> draw screen 1
    point ULA at screen 1
    page ... /> draw screen 0
    point ULA at screen 0


    Point ULA at screen page 1
    Point ULA at screen page 0
    robpearmain robpearmain December 2006 Development
  • ZXSpin 0.61 Available nowHi all! Well, after a lengthy few testing cycles, I'm taking the plunge and uploading the latest version of ZXSpin, to replace the rather aged old 0…

    ... />
    - Added much more accurate "ULA snow" and IR contention. Note ...
    Dunny Dunny December 2006 Emulators
  • When could Speccy have been born?Just a pondering excercise for those that know more about the different types of chips in the Spectrum than I. Whilst browsing the z80 page on wiki …

    ... about what`s in the ULA, or if the RAM in ...
    CKay CKay December 2006 Sinclair Miscellaneous
  • Black paper, white border. Ram fault?We have a speccy that wont work properly. When we power it up, we get white border around a black screen. We swapped the rom and ula with a working o…

    We have a speccy that wont work properly. When we power it up, we get white border around a black screen. We swapped the rom and ula with a working one, and we got the same result.

    is this a ram fault? How can we check ram chips?
    Arda Arda December 2006 Hardware
  • Spectrum Issue two problemI managed to bring back to life a issue two spectrum (at least the power supply cirquit). The screen is now crystal clear (after replacing all the el…

    ... example.
    I changed the ULA with several others to no ...
    gtsamour gtsamour December 2006 Hardware
  • ANN: Tipshop updated Monday, 08 January 2007Monday 08 January 2007 A little belated, but.... HAPPY NEW YEAR! * This is a reasonably small update, but it feels like I've been working on it for…

    ... Sun Is No Longer Producing Heat ,
    Jet Set Willy: We ...
    hackersanon hackersanon January 2007 Announcements
  • I/O contention model questionHi everyone, Sorry for my poor english. Together with a friend we are working on ZX Spectrum 48k implemented in FPGA. We have found bug in the Spect…

    ... cycles)
    During _reading_ from ULA this can't be right ...
    brian-82 brian-82 February 2007 Development
  • ANN: Tipshop updated Tuesday, 27 February 2007Tuesday 27 February 2007 Some very busy SpecChums makes for a splendid update this month! * Viktor Drozd has apparently been skipping on sleeping a…

    ... y Filemon II , Plotting , Red Heat ,
    Space Crusade and Stalker ...
    hackersanon hackersanon February 2007 Announcements
  • TV Modulator. Can it be repaired?Is it possible, to repair tha TV modulator (after removing it) if it gives wavy picture? I replaced both transistors (tr1/2) and both electrolytic ca…

    ... to the left of the ULA chip (tr6/7 ???? i don ...
    gtsamour gtsamour March 2007 Hardware
  • New Spectrum emulator for DS[url]http://zxds.raxoft.cz/[/url] [quote]Features already implemented: * Solid Z80 core - possible bugs aside, the Z80 emulation is as complete…

    ... lines at the times the ULA would read them. It looks ...
    StuBruise StuBruise March 2007 Emulators
  • It's fitting...... that in the very month that the 25th anniversary of the Speccy falls on, I'm just finishing up making my first ever Spectrum peripheral. It's a …

    ... might be suspect) or the ULA (which might also be suspect ...
    Winston Winston April 2007 Hardware
  • Faulty M1 linesI'm sure this has been discussed before, but using the forum search for the word 'M1' pulled back no hits, which surprised the hell out of me. Anywa…

    ... shows it coming from the ULA.
    Winston Winston April 2007 Hardware
  • Spectrum 48k SeettingGot an issue 2 speccy on the bench that had a poorly ula, changed that, also changed tr4 and tr5 (had no oscillator) now it just resets over and over…

    ... bench that had a poorly ula, changed that, also changed tr4 ...
    ZX-MAD ZX-MAD April 2007 Hardware
  • Some more off-topic questions...Just some more things I wonder about, especially when I can't sleep (I hate insomnia)... 1) Do jet packs actually exist? You never see them, even…

    ... kick out so much unwanted heat, which is waste energy, surely ...
    ewgf ewgf April 2007 Chit chat
  • Monday Morning (afternoon GMT) JokesThese are particularly for the ladies.. How many men does it take to open a beer? None. It should be opened when she brings it. ----------------…

    ... stand closer to the kitchen sink.

    ----------------------------------------------- --------------------

    How ...
    beanz beanz April 2007 Chit chat
  • TIPP31 transistor questionYesterday I had the time to try and repair a 4S issue 48k spectrum I had. First of all I replaced all the electrolytic capacitors. The tr4 transistor…

    ... boot. I had tryied the ULA on another machine and it ...
    gtsamour gtsamour May 2007 Hardware
  • Is Ferranti still alive ?And if not......why should there be any restrictions on manufacturing the ULA ?

    And if not......why should there be any restrictions on manufacturing the ULA ?
    Pilsener Pilsener May 2007 Sinclair Miscellaneous
  • Russian clone of ZX-Spectrum 48kThe classic russian clone of ZX-Spectrum 48k [URL="http://sblive.narod.ru/ZX-Spectrum/Leningrad48k/Leningrad48k.htm"]http://sblive.narod.ru/ZX-Spect…

    ... with simple logical compoments! no ULA chip needed !
    Gods Gods May 2007 Hardware
  • I wonder if . . .An M68k could emulate a ULA. You know, like the ZX80 used the cpu for rastering the picture on the screen. This would mean that the people who clone…

    An M68k could emulate a ULA.

    You know, like ...
    wilsonsamm wilsonsamm May 2007 Hardware
  • Unconventional way of diagnosing a faultHi everyone Some time ago I got a 48k Spectrum (issue 3B board) in a pretty bad condition. I believe the power supply transistor TR4 failed, causing…

    ... I see here is that ULA will no longer access video ... . I can't just remove ULA from the circuit because it ... it possible to disable the ULA's video generation functionality (i ... you disconnect the oscillator from ULA?

    Also, can someone ...
    Avian Avian May 2007 Hardware
  • A Spectrum that fixes itselfWell, the modulator on my 128K toastrack machine fixed itself. It used to drift horribly within the first half hour or so of power up, but now it's a…

    ... nice toasty warmth of the ULA, and regular use (I only ...
    Winston Winston June 2007 Hardware
  • What's the word . . .I'm struggling to find the english words for these things. Thinking maybe this would be the ideal place to ask: 1) something that you apply to a sol…

    ... to a solder joint. You heat up the joint, and this ...
    wilsonsamm wilsonsamm June 2007 Chit chat
  • Paul Owens loadershi I reckon Batman the movie ought to be listed as having the Paul Owens protection loader, as it has red/black loading colours, slightly faster tha…

    ... : none' on infoseek.
    (Red Heat is also listed by Ramsoft ...
    ghbearman ghbearman June 2007 Infoseek database
  • Disable onboard memoryWould this work...? Access to onboard I/O can be disabled by holding IORQGE high. Would it be possible to create a MEMRQGE in a similar way to disa…

    ...
    |
    Z80 MEMRQ +----+--/\/\/\/---+------>ULA, top 32K RAM
    | | |
    Jonathan Harston Jonathan Harston June 2007 Hardware
  • ZX Spectrum 128+ problemsHello!I recently purchased and got myself a spectrum 128+ from ebay.The item did not have an original power supply so i got a power supply of 9volts …

    ... output) or a faulty Ferranti ULA chipset?

    Unfortunately spectrum ... from tv.

    If ULA is the problem does anyone ... know if there are replacement ULA chips?I know that ferranti ... .uk/T34VG1-USSR-Made-of-ULA-Chip-for-Z80-CPU-ZX ...
    Msx2 Msx2 July 2007 Hardware
  • Fuse for Mac OS X beta releasesA beta version of Fuse for Mac OS X has been released at the dedicated sourceforge project: [url]http://sourceforge.net/projects/fuse-for-macosx/[/u…

    ... active, as the +2A/+3 ULA applies contention only when MREQ ...
    Fred Fred July 2007 Emulators
  • Home made SinclairsHi, I mentioned in another thread that I had made a ZX Spectrum out of spare parts. If you'd like to see my efforts, I've set up a simple web page o…

    ... anything clever like make the ULA circuit out of 74-series ...
    Phu Phu July 2007 Hardware
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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
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    John Elliott on April 21
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    harriusherbartio on April 21
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