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  • 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
  • +2 OverheatingMust first give thanks to Dazza75 for supplying me a replacement +2 however it seems to be overheating and corrupting graphics in games making them u…

    ... be?

    Ram fault? ULA loose. If it requires resoldering ...
    zerohour zerohour June 2012 Hardware
  • Spectrum 48K help neededI hav got an old Specrtum 48K issue 3. When I plug-in power connector it doesn't show the home screen (c) Sinclair.... From about 50 times trying to …

    ... if is the RAM or ULA?

    When I got ... it working ULA and 7805 were warm (aboput ...
    btrafela btrafela June 2012 Hardware
  • ZX81 back porch fix using LM1881Hello! Has anyone here did the back porch fix for ZX81 using LM1881? I did it this weekend and instead of clear black on white i got black on dark g…

    ... 200mv p-to-p. The ULA video output is a lot ... when i connect the circuit. ULA is over 40C for example ...
    ArtemKuchin ArtemKuchin July 2012 Hardware
  • ZX81 with black screen and some white dots.Was gearing up to do a composite video mod on my ZX81, and today was going to be it. Unfortunate when started my ZX81 seems faulty. I get a back scre…

    ... would be. I suspect the ULA. It gets a bit hot ...
    pmsr pmsr July 2012 Hardware
  • Another cause for DivIDE problems on 48K'sThe last months some topics were opened to discuss problems with 48K ZX Spectrums and DivIDE. Sofar we found: - Bad Z80's because of poor fanout (si…

    ... soldering contacts
    - Potential bad ULA's

    But today ...
    bverstee bverstee July 2012 Hardware
  • Interesting Keyboard FaultWhy-oh-why do I keep buying half-dead Speccys off fleabay. Bought this one as a source of spares, it was listed as having a non-working keyboard due…

    ... keyboard due to a possible ULA fault, I had a correct ... response, I've replaced the ULA with no change either so ...
    napoleonblownaparte napoleonblownaparte August 2012 Hardware
  • Spectrum+ and dead keyboardI have a Spectrum+ which had no picture just snow on TV. I found instructions, that it might be regulator 7805, so I changed it. Now I saw something …

    ... , which said it might be ULA, so I changed it, but ...
    lillaolle64 lillaolle64 August 2012 Hardware
  • Stealth AllRAM SpectrumHaving just received a couple of new keyboard membranes to fix a couple of machines with, the thought crossed me that I should do a special project w…

    ... is generated by the ULA, Chris Smith's ULA book shows it ...
    Winston Winston August 2012 Hardware
  • Currah microspeech schematics?Has anyone got details on the currah microspeech? I've found the ROM online and the manual is available but that seems to be about all. What I'm afte…

    ... CPLD's to emulate the ULA. I'd like to try ...
    Basher Basher August 2012 Hardware
  • Very weird +2 problem.After two days, I'm still fighting this grey +2. Symptoms: When I first got it, there were stray pixels on the screen, and stray lines and colours. …

    ... +2:

    CPU
    ULA
    AY-3-8912
    Spirantho Spirantho August 2012 Hardware
  • Issue 3 board - Free to good homeI have an issue 3 board that someone could scavenge for spares or even repair if they're willing to pay the p&p. I got it off someone on Amibay in a…

    ... .

    There is no ULA (which was working) and it ...
    napoleonblownaparte napoleonblownaparte August 2012 Sales
  • WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…

    ... replacement for the Sinclair ULA chip fitted in Spectrum ... originally generated by the ULA are not present here ... plug-in this new "ULA", and solder a piece ... all pins of the ULA socket to FPGA interface ... to prevent the replacement ULA to touch the upper ...
    mcleod_ideafix mcleod_ideafix August 2012 Hardware
  • Problems with stereo kit for AYSomeone has bought a stereo kit from me to add to his 128K ZX Spectrum. Problem however is that one of the channels is a less loud than the other tw…

    ... (ABC/ACB) cable
    - Disconnected ULA wires

    There is ...
    bverstee bverstee September 2012 Hardware
<1…11121314151617…34>

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