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  • The ZX Spectrum ULA bookFound a copy of the ZX Spectrum ULA book by Chris Smith that I've never read. This is a new book that was given to me years ago and I've never got ro…

    ... copy of the ZX Spectrum ULA book by Chris Smith that ...
    Mr Millside Mr Millside October 2020 Sales
  • Direct drive LCD screen - looking for information on previous projects people may have attempted.Hi All, My first post, so please forgive and guide if I've posted in the incorrect section. I'm a speccy user from way back in the 80's, but m…

    ... LCD panel, with some extra ULA registers, so I can add ... kind of like a small RGB monitor, except I'm planning ... won't rely on the ULA to drive the signals at ... probably replace much of the ULA, perhaps even relocate all of ...
    cj7hawk cj7hawk December 2020 Hardware
  • zx spectrum ULA upgradei have a issue 2 zx spectrum 16k which i upgraded to 48k .. i believe the ULA is faulty (ULA5C112E-2) .. seems intermittent i know a later one can be…

    i have a issue 2 zx spectrum 16k which i upgraded to 48k .. i believe the ULA is faulty (ULA5C112E-2) .. seems intermittent i know a later one can be used but should some resistor values be changed to match it ?
    thanks mark ..
    mark8bit mark8bit January 2021 Hardware
  • Microdigital TK95 / TK90X - my experiencesAs asked for by Renegade [url="https://worldofspectrum.org/forums/discussion/58189"]here[/url] I'll do a short writeup of my experiences with my TK90…

    ... -N _or_ PAL-M (the ULA supports both standards) to get ... be done (since the TK-ULA outputs RGB + bright directly) but I ... display PAL-N/M over RGB without issues.
    http://www ... . Next will be the aforementioned RGB mod and then checking whether ...
    Shockwav3 Shockwav3 February 2021 Hardware
  • 48k ULA heat sink required ?ULA heat sink worthwhile mod or just internet hype ? if worthwhile is a cheap heat sink going to cut the mustard ? i wonder if anybody has done any …

    ULA heat sink worthwhile mod or just internet hype ? if worthwhile is a cheap heat sink going to cut the mustard ?
    i wonder if anybody has done any before & after heat tests ?
    mark8bit mark8bit October 2021 Hardware
  • Interface 1 ULAIs there a technical description of the functionality of the Interface 1 ULA, similar to the "The ZX Spectrum ULA" book? Specifically, what is the…

    ... functionality of the Interface 1 ULA, similar to the "The ZX ... Spectrum ULA" book?

    Specifically, what ... the ROMEN lines of the ULA? Superficially, ROMCS feeds into the ...
    Jonathan Harston Jonathan Harston December 2021 Hardware
  • 5" RGB 15KHz monitor....Hi all, Missing having a dedicated RGB for my computers, as well as something small enough and portable so I can throw it around when fixing stuff…

    ... />
    Missing having a dedicated RGB for my computers, as well ... :3 aspect ratio, with a RGB scan converter at the back ... I can feed it composite, RGB or YUV. Thought it came ...
    cj7hawk cj7hawk December 2021 Hardware
  • ZX to EGA - it works !!I finally hooked up EGA monitor to ZX. Everybody can repeat if can hold the soldering iron in the arm. The circuit diagram is simple, it contains two…

    ... the digital values RGB, Y directly, S ( mixed , from ULA) connected to ...
    Konstantin Konstantin November 2001 Sinclair Miscellaneous
  • Didaktik M (ZX Spectrum clone selling)Here is an offer to buy ZX Spectrum clone ( DIDAKTIK M ) from Slovakia, basic info: 100% functionality, Kempston & Sinclair joysticks connectors, tap…

    ... with Speccy due to different ula timing and other small differences ... TV modulator and video out, rgb out and other ... and it ...
    promontory promontory May 2001 Sales
  • My own Home Computer It's true. My company are planning to build a new Home Computer. It will use a Z80 CPU running at 6mhz, 128k Ram and will run all Spectrum and ZX81 …

    ... 0's.
    Once RGB is loaded RGB signal is sent to ... bit sets or resets all RGB (total black, total white).
    ULA.
    ULA will also be provided for ... good idea.
    VGA/SCART/RGB/Ariel video outputs!!! Maximum possbilities ...
    cyborg cyborg October 2002 Sinclair Miscellaneous
  • Speccy +2 RGB to S-video?Okay, so I emigrated from dear old Blighty to a land rather less Speccy-friendly, the USA. I've finally managed to get a couple of Speccies over here…

    ... chip and Y off the ULA[/quote]
    This is true ... 48K ULA version.
    +2 ULA (and +3 gate array) have RGB+Br ... isseful if the telly has RGB input, but does not help ...
    secarica secarica October 2002 Sinclair Miscellaneous
  • What are the differences between the +2 and the +2A ?I only acquired a +2 for the first time in my life a few months ago. It works fine. :) I even managed to tracke down nearly all the wargames by the s…

    ... . No other spectrum has rgb output from the ula.

    Fraser ...
    Fraser Fraser October 2002 Games
  • My own Home Computer It's true. My company are planning to build a new Home Computer. It will use a Z80 CPU running at 6mhz, 128k Ram and will run all Spectrum and ZX81 …

    ... the components used to output RGB signals! Not a usual case ... /> GPU? Are you using the ULA or not? If you're ...
    cyborg cyborg October 2002 Sinclair Miscellaneous
  • has anyone converted an early speccy to drive a monitor ?sorry if this is the wrong forum, but there doesn't seem to be a hardware one, per se. I've been looking through the schematics a bit today - it see…

    The 48K ULA has component video output (Y, ... to build a component-to-RGB converter.
    Perhaps you can ...
    secarica secarica December 2002 Sinclair Miscellaneous
  • Fake screenshots? No - now it's REAL screenshotsOk then. A few weeks ago I said I will show You the new gfx-mode of Speccy and - here it is: [url="http://republika.pl/hooy_prg/hprg.zip"]http://rep…

    ... it sort of like your RGB examples on your site )
    ULA FX Hardware Multicolour to display ...
    LCD LCD March 2003 Sinclair Miscellaneous
  • Whats wrong with my spectrum 48 kWhen i startup, instead of copyright messsage i get gray screen with black square in middle.

    faults like that are usually ULA related - RAM faults almost always ... very very rare a faulty ULA will make no 'picture' at ... all - even if the RGB outputs are dead you will ...
    GP GP November 2003 Sinclair Miscellaneous
  • Whats wrong with my spectrum 48 kWhen i startup, instead of copyright messsage i get gray screen with black square in middle.

    ... /> faults like that are usually ULA related - RAM faults almost always ... very very rare a faulty ULA will make no 'picture' at ... all - even if the RGB outputs are dead you will ... is that it is a ULA related problem...? Is that something ...
    Bergman Bergman November 2003 Sinclair Miscellaneous
  • Spectrum 128 Graphics - A missed opportunity?The Spectrum 128 is my favourite model of the Spectrum - the pinnacle of the Sinclair miracle before it was hijacked by Amstrad. But I can't help thi…

    ... with the Gigascreen below the ULA will need to read ... two intensity signals from the ULA, DAC them, then use ... potential divider with the RGB outputs to create a ... need to change the ULA to read twice as ... is to simply duplicate the RGB signals for both blocks ...
    cyborg cyborg February 2004 Sinclair Miscellaneous
  • Hardware section....Wonder why here is no specific hardware forum??? No one ever touched a soldering iron here? (o; I'm kinda lost here with my hardware stuff under: "…

    ... using 2 bits for each RGB output ?

    Do you ... ;
    Though there is some ULA schematic out there using normal ...
    pern pern July 2004 Sinclair Miscellaneous
  • video problem with 128kHi. I bought a 128K (the one with the huge heat sink in the right side) some years ago. Everything seems to work properly except the screen. It doesn…

    ... obtain image through RGB connecting it to scart RGB in of a ... TV but I can't. ULA should ...
    autokrator autokrator July 2005 Sinclair Miscellaneous
  • video problem with 128kHi. I bought a 128K (the one with the huge heat sink in the right side) some years ago. Everything seems to work properly except the screen. It doesn…

    ... connecting RGB of zx to scart I got nothing although ULA may ...
    autokrator autokrator July 2005 Sinclair Miscellaneous
  • Help with dead Spectrum +2aHello. My Spectrum +2a died some time ago. It was powered on, I looked away and next time I looked at it, screen was black. I have replaced the 4 r…

    ... />
    How do I change ULA on +2a?
    [/quote]
    ULA is just a chip on ... voltage on each of the RGB pins. If you have an ...
    Spirantho Spirantho July 2005 Sinclair Miscellaneous
  • OT: but still hardware, BBC Micro questionOff Topic, but I guess people who know hardware may be able to help. Does anyone know if it is safe to have S39 jumpered in the Beebs video circuits.…

    ... sure the CUB monitors are RGB, but I can't comment ... my bed, I think the ULA's gone. An indication of ...
    guesser guesser November 2005 Hardware
  • Dot CrawlHiya, I know this might seem like a stupid question but i`ve seen the term "dot crawl" used a lot on articles about older Spectrums. I wondered if so…

    ... on a standard Speccy, the ULA produces a composite out (you ... YUV output, convert it to RGB (bypassing virtually all the analogue ...
    MikeW MikeW January 2006 Sinclair Basic
  • Dead +3The good news is I've just acquired a +3. The bad news is it doesn't bloody work. When I plug it all in and switch it on the disk drive starts spinn…

    Most probably the ULA or video circuitry.

    ... is an output via the RGB socket.

    See if ...
    DEATH DEATH February 2006 Hardware
  • Spectrum colors on PCStrange thing. When I see Spectrum game emulated on a PC or even Spectrum screenshot displayed on PC's monitor I feel that there is something wrong w…

    ... voltages for the Spectrum's ULA (that is to say the ... don't generally use an RGB style system (that is the ...
    cyborg cyborg February 2006 Sinclair Miscellaneous
  • Plasma screen RGB thingyHello. So I've bought myself a little 48K rubberkey and I'm trying to use a 42" plasma as my output - apparently I need an RGB adapter/scart thing t…

    ... Speccy it requres external UVY - RGB converter. I designed such thing ... in machine - soldered directly to ULA outputs.

    Simpler way ... get 128K machine - it has RGB and composite outs. :-)
    < ... b: I can make you RGB adapter. Price is return plane ...
    piters piters May 2006 Hardware
  • Plasma screen RGB thingyHello. So I've bought myself a little 48K rubberkey and I'm trying to use a 42" plasma as my output - apparently I need an RGB adapter/scart thing t…

    ... the UVY, so the original RGB values can't be precisely ... ? You want to say that ULA has limited bandwith ?

    piters piters May 2006 Hardware
  • NTSC for Speccy? What would happen?Hi doods. I was just reading a bit there about the TEA2000 video encoder. I'm just talking theory here. What would happen if you... Cut pins 12 an…

    ... =aowen]... However I believe the ULA in the original Spectrum 48 ... ).[/QUOTE]

    Hardly. 48K ULA performs PAL phase shift of ... .
    It complicated my UVY-RGB converter pretty: without it, it ...
    piters piters July 2006 Hardware
  • Edge-connector video...Been reading some old speccy books recently that were surplus to requirements at the local library...:-) ...and in one book it mentions that the ed…

    ... made first tests of YUV-RGB converter with protoboard attached to ... when soldered lines directly to ULA - and I had 'decent' video ... with 128K Spectrums, because their ULA generates RGB, not YUV. So, you ...
    piters piters February 2007 Hardware
<1…6789101112…34>

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