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<1…11121314151617…34>
  • New ZX-ULA2An upgraded / replacement ULA for the Sinclair ZX81 is now available. The ZX-ULA2 is a direct replacement for the standard ULA used in the Sinclair …

    An upgraded / replacement ULA for the Sinclair ZX81 is ... direct replacement for the standard ULA used in the Sinclair ZX81 ... home computer.

    The ULA is a custom chip designed ...
    rwap rwap December 2011 Sales
  • Repairing another Issue 2 48K Spectrum.I said at the start of the other thread that I've got another one of these and I've started investigating it. The board is more-or-less exactly the …

    ... they were exactly the same. ULA unplugged, I applied power again ...
    Zorn Zorn December 2011 Hardware
  • Faulty Interface one, IF1Dear all, as I have already mentioned in a different thread my IF1 stopped working for no special reason. I went through the service manual and chec…

    ... oscillator at pin 5 from ULA. There is 8Mhz available.
    maskenlos maskenlos January 2012 Hardware
  • Grey +2 video output and oddities.I've been experimenting with one of the above that I acquired years ago, but had just been buried at the back of a cupboard. I've connected it up to…

    ... the transistor that pulls the ULA's /IOREQ line high when ... like this or was the ULA bug corrected for the +2 ...
    Zorn Zorn January 2012 Hardware
  • divIDE x Spectrum clonesAnyone has a Spectrum clone and did a test with divIDE? Here in Brazil we have 2 Spectrum clones (TK90X and TK95) that are almost 95-99% compatible w…

    ... know that our ROM and ULA are slightly different of the ...
    Turrican Turrican January 2012 Hardware
  • Faulty rubber speccy - advice neededHello all speccy hardware gurus :) Recently I moved to a new flat and after a long time have some space (and time) to dig out my old Speccy hardware…

    ... lower ram chips... maybe even ULA...

    Of course, when ... them, and confirmed that the ULA from the faulty mbo worked ...
    deckard deckard January 2012 Hardware
  • SCRplusAnn: SCRplus 0.19, with a user-friendly GUI (based on GTK+). Converts images to ZX Spectrum format. Supports ULA+ format, Timex 8x1 attributes, YUV…

    ... to ZX Spectrum format. Supports ULA+ format, Timex 8x1 attributes, YUV ...
    AY Chip AY Chip January 2012 Development
  • 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…

    ... 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 pictures ...
    Winston Winston January 2012 Hardware
  • Broken +2 (Grey), need helpHello, I got a broken +2, and as I have tons of them working, I want to repair it without fear :D When I power up the machine the I see a horizontal…

    ... /> I replaced the ula first, and tested the ula on another board ...
    Arda Arda February 2012 Hardware
  • SpiffyBecause there aren't enough emulators already... [url=https://github.com/ec429/spiffy]Spiffy[/url] is my 48k Spectrum emulator, for Linux. Right no…

    ... ]

    Right now the ULA timings aren't perfect; to ...
    AY Chip AY Chip February 2012 Emulators
  • Chaosmongers has a big rant.Just received this Cronosoft related email today:....... [quote] >Hello, >I enjoy the idea of releasing new games for older platforms but... >I h…

    ... the new technologies and add ULA+ colour palettes to the game ... games modified by me for ULA+:
    >[url]http://www ... the new technologies and add ULA+ colour palettes to the game ...
    chaosmongers chaosmongers March 2012 Games
  • Strange behaviour in real hardware but not in emulatorsWell, at least not in any emulator I've tried. I've been reported by fellow forum member Macc that both our Maritrini Monster Slayer and Retroworks'…

    ... problem in emulators, unlike the ULA snow effect which can be ... between $C0 and $FF, the ULA gets confused and crashes can ...
    na_th_an na_th_an March 2012 Emulators
  • Microdrive units with weak (not dead) ULAs...Hi everybody, I've got a Microdrive unit here. It didn't work. It does now (actually, it was the ribbon had broken and the ground had lost contact, …

    ... just kept spinning as the ULA never told it to stop ... .
    I also have another ULA that exhibits similar behaviour - it ... we can get this poor ULA back up to speed? Anything ... signal before going into the ULA. It's the output that ...
    Spirantho Spirantho March 2012 Hardware
  • Lot's of Sinclair parts and sparesI have really a lot spares at home, like: - ULA's - All kinds of RAM chips Many of these parts have already been tested. Most of these parts are pu…

    ... spares at home, like:
    - ULA's
    - All kinds of ...
    bverstee bverstee March 2012 Sales
  • The impossible made possibleSome years ago Miguel Angel Rodriguez Jodar and I developed the PC Keyboard Interface (still available at SellMyRetro.com). The interface however wa…

    ... are no resistors between the ULA (matrix array) and the Z80 ...
    bverstee bverstee March 2012 Hardware
  • 48K's and bad DivIDE compatibilityI have had some 48K boards and complete machines in the past which didn't work fully with a DivIDE interface. The reason for that always was a Z80 pr…

    ... .
    I also tried other ULA's, but the problem is ...
    bverstee bverstee March 2012 Hardware
  • Speccy 48K working only as B&WMy 48K rubber key was working OK after a composite video mod (showing colors). But now it has no colour anymore. It only shows images in B&W. With pr…

    ... cause this? Is a bad ULA?
    My 48K is not ...
    Turrican Turrican April 2012 Hardware
  • Intermittent reset on 48K (issue 4S)I'be been fighting an intermittent selfreset the whole day. Changed ULA - did not help. Tested TR6 as i could and compared the reading with another…

    ... whole day.

    Changed ULA - did not help.


    ULA temp is about 48-50C ...
    ArtemKuchin ArtemKuchin May 2012 Hardware
  • Imperica Horizons - The whole weekend :-)So now it's all over, I'll do a quick writeup... It all started for me at 5.20 am. Getting to London from Devil's Island isn't so easy now that Aer …

    ... his work on the Spectrum ULA, colour timing tricks and the ...
    Winston Winston May 2012 Sinclair Miscellaneous
  • Zx 48k after the ic7805 other problemHi everyone, i am Tiago from Portugal, and i am trying to repair a Zx Spectrum 48K. the machine didn't do anything, no image, no sound, nothing. The…

    ... do now? Is it RAM? ULA?
    how can i check ...
    tiago tiago May 2012 Hardware
  • ZX-Paintbrush version 2.2 releasedDear readers, Today I released ZX-Paintbrush 2.2 with many new features. I hope you'll like it. Please refer to ZX-Paintbrush's section of my homepa…

    ... /> Important changes:
    [LIST]
    [*]ULA+ support
    [*]Timex screen support ...
    clausjahn clausjahn May 2012 Emulators
  • ZX-Editor Second Edition 2.1 releasedDear readers, yesterday I released a new version of ZX-Editor. Mainly, it now comes with picture support of enhanced ZXP file import as well as ULA+…

    ... file import as well as ULA+ and Timex support for the ...
    clausjahn clausjahn May 2012 Emulators
  • ULAPlus: showing different screen modes in one screenI wanted to write a demo showing the same screen, converted to various screen modes available on the Spectrum (well, a Spectrum clone capable of show…

    ... showing Timex hicolour mode and ULA+ mode).

    Currently, I ... ). The third one is a ULA+ screen (low res attributes with ... a Timex HiColour screen with ULA+ palette enabled.

    Each ... stated in the Andrew Owen ULA+ doc "Using the ULAplus 64 ...
    mcleod_ideafix mcleod_ideafix May 2012 Development
  • JSpeccy v0.90Hi4all, A new JSpeccy version has been released at my project webpage. This new release have many corrections, some optimizations and a few new feat…

    ... -TV filter (not compatible with ULA+), a RGB filter and a ...
    zx81 zx81 May 2012 Emulators
  • ULA TEST 3 results on real hardwareHi guys, I'm writing small spectrum emulator and I wanna implement precise emulation for different spectrum models :-) I found nice test for conten…

    Hi guys,

    I'm writing small spectrum emulator and I wanna implement precise emulation for different spectrum models :-)

    I found nice test for contended memory - [URL="http://wizard.ae.krakow.pl/~jb/qaop/t/ulatest3.tap"]ulatest3.tap ...
    ZXMAK ZXMAK May 2012 Emulators
  • Faulty Grey Spectrum +2 - help neededI have a faulty spectrum +2. I tested the voltaged inside - all check fine. Well, within some limit, +5 for example is 4.83, but all other voltages a…

    ... .

    I cannot swap ULA because i don't have ... . I don't know is ULA for toastrack 128K is the ... are fine. What's left? ULA and RAM.
    Cannot test ... ULA and how not idea how ...
    ArtemKuchin ArtemKuchin May 2012 Hardware
  • JSpeccy v0.91A new JSpeccy version has been released. Summary of changes, - The keyboard has been reassigned: Both SHIFTs == Caps Shift Both CTRLs == Symbol Shi…

    ... described by csmith in his ULA Book with a more wide ...
    zx81 zx81 June 2012 Emulators
  • Simple explanation of interrupts (in the context of Z80/Speccy)I wondered if somebody on here could explain in simple terms how interrupts work on the Speccy and where interrupts are source from. Are they a natur…

    ... are they instigated via the ULA? Are Speccy interrupts per-frame ...
    takapa takapa June 2012 Development
<1…11121314151617…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
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    harriusherbartio on April 21
  • Elusive Strategy Games done by the Smaller or less Prolific Software Houses.
    harriusherbartio on April 21
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  • +3 Disk drive motor
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  • Celebrity deaths...
    mel the bell on April 20

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