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  • +2A ProblemHi ! I just got a +2A and it has a powerup problem. When I turn it on it just displays 1987 1987 over the first few lines and a random attributes p…

    ... the screen. It seems the ULA and Z80 are fine (picture ...
    Tom-Cat Tom-Cat May 2005 Sinclair Miscellaneous
  • Dead Speccies and IF1 ULAsLooking for dead Spectrums to repair (I'll even give them back working if you ask [I]really[/I] nicely - and you pay for 'em :) ). Also I have Interf…

    ... 1s that need a new ULA so if anybody has any ...
    Spirantho Spirantho June 2005 Wanted
  • nec780 vs z80aHi everyone! Got a 48k issue 2 board with nec780 with a mts2369 at its back.(spider?) Between pin 11 of the cpu and pin 14 of ic 23 theres a resis…

    ... half. (i have changed the ula for a known working one ...
    odious odious September 2005 Sinclair Miscellaneous
  • ZX-81 Ram Pack problemHi! I know this is a ZX Spectrum forum, but I am hoping someone here might be able to help me out... I have posted this to c.s.s. but noone was able…

    ... OK too. All traces to ULA and edge connector are OK ... than any others), only the ULA run hotter. But thats normal ...
    Tom-Cat Tom-Cat September 2005 Sinclair Miscellaneous
  • ANN: Tipshop updated Sunday, 30 October 2005Sunday 30 October 2005 Crivvens! What an indecently massive load of stuff this month - a veritable feast of tips, maps, POKEs and complete solutions.…

    ... , Sinbad And The Golden Ship , Snow Joke! ,
    Solvaldol-X , Souls ...
    hackersanon hackersanon October 2005 Announcements
  • Z80 cycle contentionHi, Does anybody knows exactly when the ula halts the Z80 clock during a memory r/w cycle? I mean which Z80 clock cycle, T1 or T2? Thanks..

    Hi,
    Does anybody knows exactly when the ula halts the Z80 clock during a memory r/w cycle?
    I mean which Z80 clock cycle, T1 or T2?

    Thanks..
    Mp Mp November 2005 Hardware
  • When is a clone not a clone?If a Spectrum is built from scratch, using new components where available, is it a clone, copy or something else? See, I won an unpopulated Spectrum…

    ... PCF 1306P IC, LM1889 IC, ULA IC, the loudspeaker and the ...
    DEATH DEATH May 2006 Hardware
  • Faulty 128KI digged out my Spectrum 128, and it wakes not up. I don't have experience, only with 48K. Maybe someone can give me some hint, clue. It looks like m…

    ... /> It looks like memory (or ULA, CPU, memory control logic) error ... worth to replace RAM chips? ULA is warm (probably normal), but ...
    piters piters June 2006 Hardware
  • Too. Damn. Hot.It is well known that the melting point of a computer geek is 27 degC. Being in a 30+ degC heat does not make me a happy bunny. Bring back the snow!

    It is well known that the melting point of a computer geek is 27 degC.

    Being in a 30+ degC heat does not make me a happy bunny.

    Bring back the snow!
    NickH NickH July 2006 Chit chat
  • Racing games with various weather conditionsAre there racing games for Speccy with various weather conditions (rain, snow, night etc.)?

    Are there racing games for Speccy with various weather conditions (rain, snow, night etc.)?
    PopoCop PopoCop July 2006 Games
  • 128k dead, no TV signalI got 128k spectrum (heatsink model) from a friend of mine. He told me that speccy is dead, and he doesn't know what's wrong with it. When I plugged…

    ... be -12V?)


    ULA is: AMSTRAD 40056 8620
    netomc netomc September 2006 Hardware
  • Spectrum Screen Memory MapWhat's the advantage (mistery?) behind ULA's spectrum screen memory interpretation? 6144 bytes divided into 3 blocks, 2048 bytes long. if you want t…

    ... 's the advantage (mistery?) behind ULA's spectrum screen memory interpretation ...
    Arda Arda October 2006 Development
  • 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
  • HalloweenBrilliant. Check out the links at the bottom too, esp the Snow Dalek. [url]http://www.evilmadscientist.com/article.php/DalekPumpkin[/url]

    Brilliant.

    Check out the links at the bottom too, esp the Snow Dalek.

    [url]http://www.evilmadscientist.com/article.php/DalekPumpkin[/url]
    NickH NickH October 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
  • Dead Spectrum diagnosis and desolderingI have two dead Spectrums - one I'm pretty sure is caused by bad memory, and the other - well, perhaps a bad ROM, perhaps a bad CPU (it gets halfway …

    ... socketed ICs (except for the ULA in the issue 2 Spectrum ...
    Winston Winston 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
  • 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
  • Blowtorch method of Speccy repairsI just did my first Spectrum repair (and successful at that). It was the Issue 2 spectrum I wrote about a while ago, I just hadn't got around to doin…

    ... .

    I removed the ULA. The fact this chip is ... fails again). I replaced the ULA, plugged it in... and I ...
    Winston Winston January 2007 Hardware
  • We're a bunch of wussesLess than an inch of snow has fallen. EVERYBODY PANIC. [url]http://news.bbc.co.uk/1/hi/england/6293511.stm[/url] OK everybody, listen up. THIS is w…

    Less than an inch of snow has fallen. EVERYBODY PANIC.
    < ... up. THIS is what real snow looks like:

    [url ...
    NickH NickH January 2007 Chit chat
  • Let is snow let it snowFor those of use in the south and west of the country including those in Northern Ireland its going to be a snowy one tonight and tomorow. They say …

    For those of use in the south and west of the country including those in Northern Ireland its going to be a snowy one tonight and tomorow.

    They say up to 10-15 CMs in some places.

    [url]http://news.bbc.co.uk/player/nol/ ...
    Scottie_uk Scottie_uk February 2007 Chit chat
  • 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
  • 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
  • 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
<1…11121314151617…34>

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