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<1…12131415161718…34>
  • +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
  • Anatomy of a bad M1No, not the motorway (although at times the tarmac M1 goes about as well as this one...) But the bad M1 problem that seems to occur most with issue …

    ... 'll have to check the datasheet to find out what exactly ...
    Winston Winston 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
  • DivIDE CompatabilityThe Spectrum is 30 show proved a valuable event for investigating issues with Spectrums which do not work with the DivIDE.... The ones I sell are ma…

    ... for repair displayed some possible ULA problems as without the DivIDE ...
    rwap rwap September 2012 Hardware
  • +2 (Grey) S-video?I have a pretty good Composite/S-video to VGA adapter that does a nice work of running my retro machines on an old LCD screen. However, it looks best…

    ... much I study the TEA2000 datasheet, I can not see a ...
    Johan1973 Johan1973 September 2012 Hardware
  • Revisiting Spectrum CPU clock regenerationWarning: This post will be a bit nerdy :-) Some time ago, I experimented with phase locked loop circuits as a possible way to regenerate the Spectru…

    ... 3.5MHz clock as the ULA generates it internally, and the ... in perfect sync with the ULA only about halfway across putting ...
    Winston Winston September 2012 Hardware
  • Semi-Dead Spectrum - Help RequestedI have finally got my hands on my two old Spectrums - neither of which work, but ideally I hope to get both of them working again. Spectrum number o…

    ... board, and an Issue 7 ULA.

    Spectrum number two ... 3 with an Issue 6 ULA. It is number two I ... service manual suggests replacing the ULA, but that hasn't made ...
    ramsrc ramsrc October 2012 Hardware
  • semi dead speccy 48k who can helpHi forum , i am busy recovering a 48 k speccy issue 3 board unit. With the help of a more experienced spectrum user from the uk , i managed to get…

    ... the verified all connections to ula and cpu via diodes d1 ... might be defective ?? ( i assume ula but how to prove that ... ?? )

    Ula is ofcourse the "6C001E-6 ... or maybe has a working ula for sale ??


    techy techy October 2012 Hardware
  • WTB: Interface 1 ULAsHi everybody, I suspect it's unlikely, but does anybody have any spare Interface 1 ULA's lying around? Would be happy to send a bit of cash in excha…

    Hi everybody,

    I suspect it's unlikely, but does anybody have any spare Interface 1 ULA's lying around? Would be happy to send a bit of cash in exchange for any - I have about 4 ULA-less IF1s here. :)

    Thanks!
    Spirantho Spirantho October 2012 Wanted
  • Velesoft's ZX128+2 with 1.5MB memoryMy old ZX128+2 PROFI (grey model - spanish version) for sale here: [url]http://aukro.cz/super-zx-spectrum-128-2-1-5-mb-i2738723874.html[/url] Back s…

    ... next modes is automatically activated ULA raining protection.

    - is ... full speed without slow down. ULA can slow down only CPU ... ZX is used only for ula video data.

    - new ...
    velesoft velesoft October 2012 Sales
  • ZX-Preview 2.1 publishedDear friends and ZX-Speccy fans! Today I've released a new version of ZX-Preview. I completed the to-do-list for the program and added the following…

    ... /> * ability to display tiles and ULA+ screen$

    Hope you ...
    clausjahn clausjahn October 2012 Emulators
  • The great 128k ConversionWell, I am not sure if it is going to be great. Hopefully it will! This evening, I set about getting my Issue 6A Spectrum Plus working. I suspecte…

    ... from the factory with the ULA socket in upside down.
    ramsrc ramsrc October 2012 Hardware
  • Cycle exact emulation?I was just reading the thread about +3 emulation having different results on different emulators, and it made me wonder if any Spectrum emulators hav…

    ... actions of some instructions, exact ULA behavior prediction, and the way ...
    ewgf ewgf November 2012 Emulators
  • Strange failure modeI just had a 48K machine "fail" in what seemed like an odd way. Problem: Random keypresses (not from any particular part of the key matrix) appearin…

    ... all the inputs to the ULA to make sure the pull ... a possible problem with the ULA.

    But when I ...
    Winston Winston November 2012 Hardware
  • Brief report on Retroma?Well, that's the last retro event of 2012 for me at least - five days of Retroma??a have just come to a close. This event is held as part of the Wee…

    ... such as Chris Smith's ULA book.

    [img]http ...
    Winston Winston November 2012 Sinclair Miscellaneous
  • Spectrum 128K & Philips CM8833Hello to everybody, My Philips CM8833 is one of my favourite monitors of all time, as it accepts connections from anything I can think of with the e…

    ... amplitude, but the Vsync (meaning ULA Pin 23) is only 2 ...
    Falco-F8L Falco-F8L November 2012 Hardware
  • Microdrive without interface 1 on a Spectrum +2The [B]divide [/B]is not compatible with the interface 1. however, I would like to use the microdrive on a Spectrum +2. it would be possible to recre…

    ... in the interface 1 without ULA?
    or someone has an ...
    DerSchatten DerSchatten November 2012 Hardware
  • Standard for upgrading the original ZX Spectrum[B][U]1. Easily connect external ULA and video RAM.[/U][/B] [url]http://zx.clan.su/forum/8-102-576-16-1352476666[/url] The method consists in blocki…

    ... ][U]1. Easily connect external ULA and video RAM.[/U][/B ... the CPU clock of the ULA, and connect the external clock ... lock the clock on the ULA, set the zero level at ...
    Black_Cat Black_Cat November 2012 Hardware
  • How far are we from a single-chip 100% ZX Spectrum compatible solution?I really like to read about the projects of some geniusses here on WoS who are working on their ZX Spectrum clones. IMHO some main steps that have b…

    ... description of the ZX Spectrum ULA
    2. the clones without ... the ULA but with only logic chips ...
    3. the ULA plus/SPECTRA solutions inside an ...
    bverstee bverstee December 2012 Hardware
<1…12131415161718…34>

Latest Posts

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