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Search Again :: Adv Search 1000 results in 0.022s
<1234567…34>
  • eBay 128K Spectrum RGB cables overheat the Spectrum!?Hi everybody, For a long time I've wondered why Spectrum 128K Toastracks were overheating when using my Retro Computer Shack RGB SCART cable. Today …

    ... using my Retro Computer Shack RGB SCART cable.
    Today I ... SYNC! The poor ULA is driving the RGB switching as well as ... can tell if the ULA is over-stressed by measuring the output ... TV allows you to select RGB/Composite, you can still switch ...
    Spirantho Spirantho October 2013 Hardware
  • Whats the best composite or Rgb video signal to HDMI convertor boxIm looking at this one which is 20 pounds http://www.ebay.co.uk/itm/192200878335 there are good reviews on youtube, plus it does composite or r…

    ... , plus it does composite or rgb so will work well with ... spectrum +2 which can output rgb over scart, which converts better to ...
    Level20 Level20 June 2017 Hardware
  • eBay 128K Spectrum RGB cables overheat the Spectrum!?Hi everybody, For a long time I've wondered why Spectrum 128K Toastracks were overheating when using my Retro Computer Shack RGB SCART cable. Today …

    ... using my Retro Computer Shack RGB SCART cable.
    Today I ... SYNC! The poor ULA is driving the RGB switching as well as ... can tell if the ULA is over-stressed by measuring the output ... TV allows you to select RGB/Composite, you can still switch ...
    Falco-F8L Falco-F8L October 2013 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. 7805 ...
    ArtemKuchin ArtemKuchin July 2012 Hardware
  • The ULA and ScreenI've asked something similar before but please bear with me. I'm trying to understand the way the screen is controlled. The ULA controls output to …

    ... the Z80 and the ULA as two devices running ... at a time. The ULA obviously takes priority, so ... have no control over the ULA. As the ULA runs through its ... the attributes as the ULA passes over them, and get more ... the same location - the ULA will pick up the first ...
    Dunny Dunny November 2005 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…

    ... /> The DivIDE must overrule the ULA control over the /CSROM.
    The ... ULA controls the /CSROM within the ...
    bverstee bverstee November 2012 Hardware
  • Faulty 48kHi all, Been a long time since my last vist to the site. I have an issue with a 48k I just picked up. When I type load "" and hit enter nothing hap…

    ... it worth me swapping the ULA chips over and try to load ...
    Rocky1980 Rocky1980 April 2013 Hardware
  • Faulty 48kHi all, Been a long time since my last vist to the site. I have an issue with a 48k I just picked up. When I type load "" and hit enter nothing hap…

    Well I swapped the ULA chips over and it loaded up a game first time :) So thats one 48k working. Thanks all


    PS does anyone have a spare ULA chip laying round ??


    Thanks
    Rocky1980 Rocky1980 April 2013 Hardware
  • Wanted: RGB SCART cable for heatsink 128K and ULA for issue 3 ZX SpectrumHi all, I'm after an RGB SCART cable for a heatsink 128K as well as a replacement ULA for an issue 3 ZX Spectrum (Ferranti ULA from memory). Can an…

    ... />
    I'm after an RGB SCART cable for a heatsink ... as well as a replacement ULA for an issue 3 ZX ... Spectrum (Ferranti ULA from memory). Can anyone help ...
    gizmomelb gizmomelb May 2008 Wanted
  • 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…

    ... get a couple of Speccies over here with me (a + and ... .

    The +2's RGB-out socket seems the most ... ' British 21" SCART-equipped telly over here too for running all ... to get a Speccy working over here - and of course I ...
    Jazzbeaux Jazzbeaux July 2002 Sinclair Miscellaneous
  • ULA Replacement WORKS !Hi chaps. Lots of activity over the last couple of weeks, and _finally_ we have [B]a working ULA replacement[/B] !! The analogue components such …

    ... .

    Lots of activity over the last couple of weeks ... we have [B]a working ULA replacement[/B] !!

    The ...
    csmith csmith May 2008 Hardware
  • 48K Speccy Repair Log.Some people may know my love for writing up my repairs of arcade PCBs on various forums so thought I would do the same for this little fella. Had th…

    ... troubleshooting this using the RGB interface was a bit ... straight away. Going over the RAM chips with ... head, with a working ULA (subsequently tested on another ... right. By swapping chips over I could prove that ...
    Flipping the board over I could see the track ...
    Womble Womble August 2010 Hardware
  • Broken keyboard due to broken ULARecalling csmith's thread about dead ULAs, a thread appeared in the Zonadepruebas (Spanish) forum regarding... a dead ULA, but only a partially dead …

    ... (Spanish) forum regarding... a dead ULA, but only a partially dead ... to life.

    "Another ULA knackered!" I thought...but... how ... to read something from the ULA. This combination (the most ... side empty. Turning the board over it looks like this:
    Winston Winston October 2010 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 monitor to analogue RGB mode and the result ... that was very bright over all and the full ... functions correctly as a TTL RGB output. Interestingly, this results ... the transistor that pulls the ULA's /IOREQ line high ... this or was the ULA bug corrected for the ...
    Zorn Zorn January 2012 Hardware
  • Occasional noise over RGB on +2AHi all I have a +2A that is misbehaving at the moment. I'm using the RGB to SCART lead (which incedentally is great on my +3) The problem is, the …

    ... moment. I'm using the RGB to SCART lead (which incedentally ...
    actualreality actualreality February 2012 Hardware
  • Experiments mixing ULA+ and Timex Hicolour featuresI'm trying to improve my Verilog skills, so I've written a description of a complete ZX Spectrum 128K (+2 grey ROMs), with AY-3-8912. I wanted to add…

    ... -8912. I wanted to add ULA+ support, and in the way ... been used to implement the ULA+ palette registers.

    I ... are actual shots from the RGB 1084 monitor, not an emulated ... to add this to the ULA+ page, if you wish ...
    mcleod_ideafix mcleod_ideafix April 2012 Hardware
  • ZX Spectrum ULA core available at OpenCoresHi! On April, 23th, I opened a new project at the OpenCores website: [url]http://opencores.org/project,zx_ula,Overview[/url] Right now, it has a, h…

    ... , hopefully, complete description of the ULA chip, written in Verilog, and ... not VGA, but original PAL RGB timmings, so some cabling is ... on it to act as ULA, with a true Z80 and ... way I hope to tune ULA timmings in case there's ...
    mcleod_ideafix mcleod_ideafix April 2012 Hardware
  • SPECTRA - RGB SCART Interface for 48K SpectrumSince the launch of the SPECTRA interface back in June 2012, some discussion of it has appeared in the forums in the past (mainly [URL="http://www.wo…

    ... function being to provide a RGB connection to the SCART socket ... not implement support for the ULA+ specification and it is not ...
    Fruitcake Fruitcake April 2013 Hardware
  • Plea for new hardwareI'm posting this as a poll as I want to judge if I'm a solo loon going on about this, or if people really are interested in either of the following S…

    ... and generates a SCART-compatible RGB image of its own. ... Timex-multicolour functions from the ULA+ specification[/B].

    ... real hardware, instead of stumbling over a diversity of devices and ... without much support. And yet ULA+ seems to be something ...
    joefish joefish April 2014 Hardware
  • 48K rgb output? Also, OTLA.A couple of weeks ago I scored 2 48K Spectrums on eBay for ?27 with 1 PSU, 1 TV cable and about 10 tapes....score or what!!!! One turned out to be a…

    ... Issue 2 with the tranny over the Z80.

    So ... run my +2 through via RGB, after modding the signal output ... up to an RGB input? 48K to SCART RGB would be ideal ...
    Ricardo99 Ricardo99 June 2014 Hardware
  • Issue 3 ULA ProblemsI've been given an Issue 3 48k to fix. It was producing no video and no picture on the TV. The coil was buzzing so it was getting power and all the v…

    ... problem might be with the ULA.

    Sure enough, ... using.

    If the ULA is only partially working, and ... the wrong tree with the ULA because when dropping the partially ... , the same issues are carried over.

    Any help appreciated ...
    retrogamemart retrogamemart November 2014 Hardware
  • My experience with a ZX Spectrum clone called Elwro 800 JuniorAfter a long break in using this forum (modellrailroading is my main hobby) I'm back and want to tell something about an interesting ZX Spectrum clon…

    ... functionality of ZX Spectrum's ULA. Please note, that because ... make an exact copy of ULA and as so, there are ... with current limiter and an over-voltage protection based on a ... original signals in RGB port. Together with provided RGB -> EuroSCART cable ...
    brian-82 brian-82 August 2015 Hardware
  • Currah Microsource ULA & ROMI have a few original (over one hundred) brand new (1986) Microsource ULA's and ROMs in prefect condition. Is anyone interested? My user name may …

    I have a few original (over one hundred) brand new (1986) Microsource ULA's and ROMs in prefect condition.
    Is anyone interested?
    My user name may help authenticate this post.
    dktronics1981 dktronics1981 April 2016 Hardware
  • Redesigning the ZX Spectrum 128k - A lifelong dreamHello, I am myPinballs (Jim) and i run a small business here in the uk making replacement 8-bit hardware pcbs for arcade pinball games as well as…

    ... hardware for various pinball systems over the last few years the ... total
    • High quality picture - RGB scart socket with proper tv ... connection
    • Uses the 128k ULA IC - Ferranti 7K010E/Amstrad 40056 ...
    myPinballs myPinballs August 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 …

    ... to do this with the RGB signals - split them to ... that colour invisible on an RGB connected display (and thus hide ... going to risk damaging the ULA by demanding too much power ... up two TVs, one by RGB and one by just AV ... out of the RF/AV/RGB port of the Speccy it ...
    joefish joefish October 2016 Hardware
  • I can't get my +2B to work over RGB to SCART.Hi so I have a black +2B and no matter what I do I get a black screen using the RGB-SCART scart cable (specific for the model ) and I'm using a SCART…

    ... a black screen using the RGB-SCART scart cable (specific for ... correct anything above 1v selects RGB? I'm pretty lost what ...
    ivanb303 ivanb303 September 2017 Hardware
  • Got Myself a 128K “Toast Rack”! (Plus a simple audio fix guide.)I got myself a 128K Spectrum off of eBay the other day. It’s in pretty good nick, but the membrane went the way of the dodo sometime during shipping …

    ... two resistors that mix the ULA and AY audio to make ... to make an RGB cable. The picture quality over the composite output ...
    Ast_A_Moore Ast_A_Moore January 2018 Hardware
  • Nasty vertical pattern on a 128K Toast Rack via RGBI managed to fix the busted membrane on my [url="https://www.worldofspectrum.org/forums/discussion/55755/got-myself-a-128k-toast-rack-plus-a-simple-a…

    ... was able to make an RGB-to-SCART cable for ... Playing sounds, both via the ULA and the AY, also affects ... suspect a fault with the ULA (or some sort of ... chip receives the same RGB signals as the ULA outputs to the ... inputs that leaks into the ULA’s signals and into ...
    Ast_A_Moore Ast_A_Moore January 2018 Hardware
  • 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…

    ... -ported memory ) that maps over the Spectrum lower 16K, and ... LCD panel, with some extra ULA registers, so I can ... kind of like a small RGB monitor, except I'm ... 't rely on the ULA to drive the signals ... probably replace much of the ULA, perhaps even relocate all ...
    cj7hawk cj7hawk December 2020 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 ... to 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
<1234567…34>

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