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  • Keyboard issues. Select keys not working.Hi Guys, Well it seams problems are like buses, you wait awhile, nothing turns up, then a couple at once. I have just got one issue 2 48k going…

    ... finger being pointed at the ULA in such situations. Man I ... witnessing the demise of two ULA's in one day! Oh ...
    RSwipeCA RSwipeCA September 2016 Hardware
  • Ebay refund annoyanceI ordered 5 PS4 games from 5 separate sellers on ebay and 3 turned up within 2-3 days. 2 games didnt turn up and i gave it a few extra days till t…

    ... a way for me to bypass this 8 day weight or ...
    festershinetop festershinetop October 2016 Chit chat
  • No sound from ToastrackHi everyone, not posted in here in a while! Anyway I have a really nice "toastrack" I am working on at the moment which just needs a new keyboard …

    ... (hope it isn't the ULA)? It loads and runs everything ...
    britain4 britain4 October 2016 Hardware
  • Meddling with the RGB signal - any experts out there?A few questions, if anyone knows - is it OK to split the A/V signal and feed it to two TVs? I'm assuming that it's not OK to do this with the RGB …

    ... going to risk damaging the ULA by demanding too much power ...
    joefish joefish October 2016 Hardware
  • Spectrum +2 various problemsHey there, I just recently acquired a Spectrum +2 and it's got various problems with it. First off, I get a rolling picture through both RGB and comp…

    ... I may have a bad ULA on my hands as well ... . Would a bad ULA cause a rolling picture or ...
    ApolloBoy ApolloBoy October 2016 Hardware
  • bizarre error on a grey ZX Spectrum+2 - the long search for a small problemHi, I got a ZX Spectrum+2 that worked a bit but crashed while loading or running 128k games. I installed a 128k-test-ROM that told me about RAM fa…

    ... ; no effect
    * changing the ULA and the gate array 40058 ...
    ingo ingo November 2016 Hardware
  • Shimmering displayHi all, I've got a 48K issue 4S and it appears to be working apart from it's displaying weird vertical shimmering patterns. It passes a RAM test t…

    ... /> I've swapped out the ULA with no change and also ... display after it leaves the ULA now after swapping all that ...
    Jet5y Jet5y November 2016 Hardware
  • How would you approach parallax?So ... there is this trick by Joffa that we all know...of waiting for the ULA to reach certain pattern on the screen using the IN command. And then s…

    ... know...of waiting for the ULA to reach certain pattern on ...
    tstih tstih November 2016 Development
  • New Game: Crappy CratesHeres something I knocked up for the festive period, a bit of a Sokoban type affair where you have to stack crates in the designated area whilst avoi…

    ... />
    Features music by Yerzmyey, ULA+ colours and a few bugs ...
    daveysludge daveysludge December 2016 Brand new software
  • Contended memory article on WikipediaYeah, apparently there's one. https://en.m.wikipedia.org/wiki/ZX_Spectrum_Contended_Memory [quote] However, the ULA must wait for a Z80 read or wr…

    ...

    [quote] However, the ULA must wait for a Z80 ... access the memory. As the ULA has no capacity to prefetch ... is in progress when the ULA must read video data, the ...
    Hikaru Hikaru December 2016 Sinclair Miscellaneous
  • help with my original issue 3b from when i was a teen. possible lower ram fault.hello, well ive tried to fix my old speccy, but haven't made much progress. could you help me out with some diagnosis. the fault occurred about…

    ... . so could this be ula? but the ula seems fine in the ...
    cypher007 cypher007 December 2016 Hardware
  • ZX Spectrum 48k issuesHi all! A couple of days ago I bought my first 48k Speccy off ebay (I already own a beautiful QL expanded with QubIDE interface and 640k ram). It was…

    ... " the clk line from the ULA (6c001e-7) to the z80 ...
    Trantor Trantor January 2017 Hardware
  • TK90X/TK95X specific software?Is there such a thing? Also: When setting the ULA in 50Hz (PAL-N) mode the timing appears to get quite close to the original ZX as seen with the sho…

    ... ?
    Also: When setting the ULA in 50Hz (PAL-N) mode ...
    Shockwav3 Shockwav3 January 2017 Software
  • Speccy won't bootHi all, I've got an issue 3 48k that won't boot properly. When I turn it on, it either does one of the two following things, it either displays a …

    ... 've also swapped over the ULA and no change there either ...
    Jet5y Jet5y January 2017 Hardware
  • Screen resolutions and the Speccy's limits?What list of screen resolutions/palettes could the ZX Spectrum feasibly produce on a standard PAL TV if RAM, ULA or other space constraints is not a …

    What list of screen resolutions/palettes could the ZX Spectrum feasibly produce on a standard PAL TV if RAM, ULA or other space constraints is not a limiting factor. What are the theoretical limits for a 128K model for example and why?
    Rebelstar Rebelstar January 2017 Hardware
  • +2 tape input protectionI'll start this by admitting I've not checked on a 48K or Toasty-Rack diagram to see how the tape input is actually wired in but what I'm asking is f…

    ... less fed straight into the ULA on these machines.

    spider spider January 2017 Hardware
  • Issue 2 problem.Hi all, I'm trying to repair / upgrade an Issue 2 Spectrum for a friend, but have come accros the following problem. When I power the machine …

    ... spares box, and swapping the ULA with another working one.
    prime prime February 2017 Hardware
  • Lambda 8300 Color module (ZX81)I was gifted such a device yesterday and have a few questions ... First of all it appears the interface does work in general when used with a 16K …

    ... required due to a 2C210E ULA, no inverse video - quality on ...
    Shockwav3 Shockwav3 February 2017 Hardware
  • Looking for advice on building a HarlequinNew member here. From the US. My first computer was a Timex Sinclair 1000 back in the early 80s (in fact, I got one of the first batches sold in th…

    ... 've purchased Chris Smith's ULA book and am anxious to ...
    msansom msansom February 2017 Hardware
  • Powering the Halequin 128....Hi all, I've just ordered a Harlequin 128, and have been looking at the documentation. Looking at the way it is designed, it looks like it's de…

    ... would it be possible to bypass the regulator and run the ...
    prime prime February 2017 Hardware
  • Spectrum 48k Clock SpeedSo I was reading the [url="http://www.worldofspectrum.org/pub/sinclair/technical-docs/ZXSpectrum48K_ServiceManual.pdf"]Spectrum 48k Service Manaul[/u…

    ... the logic
    gate array (ULA) and has a standard three ... wrong isn't it? The ULA gets a 14MHz clock but ...
    msansom msansom February 2017 Hardware
  • ZX-Paintbrush 2.6.2 publishedDear readers, I'm back since some months. I returned to a few programming on ZX-Blockeditor, ZX-Assembler. Today I fixed a problem on ZX-Paintbru…

    ... -Paintbrush having to do with ULA+ drawing cluts 1,2 or ...
    clausjahn clausjahn March 2017 Software
  • ZX Spectrum border and sound problemAfter recap stange problem with ZX Spectrum (issue 3b) with sound and border. See video at: [url="https://drive.google.com/file/d/0BwhYHKW6xjI-aVdMcE…

    ... little slow. I was replaced ULA, CPU, ROM, RAM, (same thing ... friend take osciloscope screenshoot from ULA pin 28 and speaker here ...
    skydiver021 skydiver021 March 2017 Hardware
  • ZX Spectrum border and sound problemAfter recap stange problem with ZX Spectrum (issue 3b) with sound and border. See video at: https://drive.google.com/file/d/0BwhYHKW6xjI-aVdMcEY4ajVk…

    ... little slow. I was replaced ULA, CPU, ROM, RAM, (same thing ... friend take osciloscope screenshoot from ULA pin 28 and speaker here ...
    skydiver021 skydiver021 March 2017 Hardware
  • Another 48k Speccy acting as a 16K model.Hi all, I originally was going to post asking for help to fix the new addition to my family a very nice condition Issue 2 sold on ebay as a 16K model…

    ... quirk of the 6C001E-5 ULA dunno.
    Just wish my ...
    povvercrazy povvercrazy April 2017 Hardware
  • Fastest way of reading from EAR portI'm trying to work out the fastest way of reading data from the EAR port and assembling the bits into a byte. I came up with this code: IN A, (C) ; …

    ... 5 and 7 of the ULA port are always 1, so ...
    i love the z80s i love the z80s April 2017 Development
  • ZX Diagnostics v0.35 ReleasedHi all, I'm pleased to announce the release of zx-diagnostics v0.35, downloadable from [url="https://github.com/brendanalford/zx-diagnostics/relea…

    ... /Sinclair joystick to select testcard / ULA / soak testing
    - Add countdown ... with Timex port conflicts during ULA test
    - Handle rollover of ...
    balford balford May 2017 Hardware
  • 128K memory bank selection to avoid contention issuesI'm currently developing a game and I'm trying to get my head around the memory contention issues of the various 128K/+2/+2A/+3 spectrum models in or…

    ... 16K. Also that when the ULA is drawing the screen it ... it is "contending" with the ULA for access to the data ... and the ULA has priority. With this in ...
    adrian_singh adrian_singh May 2017 Development
  • LnxSpectrum - one of the best emulators?Anyone is using the LnxSpectrum? Supports DivIDE (master and slave, up to 1MB of memory), RTC, DMA (!), SAA and 2xAY, ULA+, K-Mouse, CPU up to 20 …

    ... ), RTC, DMA (!), SAA and 2xAY, ULA+, K-Mouse, CPU up to ...
    scz scz July 2017 Emulators
  • ZX Spectrum 48K it only shows colored barsHello, I'm new to the forum and I need help with a ZX Spectrum 48K which I bought recently unfortunately defective. I want to mention that before t…

    ... RAM issue or (worse ) a ULA one.
    I checked voltages ... the RAMs or/and the ULA processor?

    Thank you ...
    Trafic Trafic July 2017 Hardware
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