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<1…19202122232425…34>
  • Tricks with IN 31It's generally considered unwise to use a Kempston joystick's fire button to start a game, because the floating bus effect can make arbitrary data ap…

    ... read IN 31 while the ULA is still drawing the upper ...
    ajmoss ajmoss April 2010 Hardware
  • Trying to fix Spectrum Issue TwoHello everybody, I bought from eBay three Spectrums - one is Issue Two and the other two are Issue 3. The Issues 3s look like they are working but t…

    ... #ht_2732wt_1167]ZTx213[/url]) are both faulty so I ordered them on ...
    Valentin Valentin April 2010 Hardware
  • Fixed schematic of zx128+2 (grey)This is new fixed schematic of ZX Spectrum 128+2 (grey model) [url]http://velesoft.speccy.cz/other/zx128plus2-iss3-schematic%28corrected_v01%29.png[/…

    ... and absent signal IORQGE in ULA part....

    This is ...
    velesoft velesoft April 2010 Hardware
  • ZX Microdrive spares or repairHi, does anybody have a faulty Microdrive they don't need?

    Hi,

    does anybody have a faulty Microdrive they don't need?
    eptheca eptheca April 2010 Wanted
  • OMD at the Vintage Computing FestivalJust got this via Farcebook: (Also add to the list of speakers our very own [B]csmith[/B] on the Spectrum ULA) NEWS RELEASE A walk on the geek side …

    ... ]csmith[/B] on the Spectrum ULA)

    NEWS RELEASE
    Winston Winston April 2010 Announcements
  • Video problems in a +2BI was looking for the original thread, but I didn't found it... I've got a +2B with video problems through RF modulator (nothing special, all of my …

    ... suspect that the TEA2000 is faulty, but I don't know ...
    Zup Zup April 2010 Hardware
  • Spectrum+ from ebayI recently received a Spectrum+ that I bought off ebay for about ?10 including postage. I have not tested it yet but had a quick look inside through …

    ... can remember. Spectrums were all ULA, transistor and RAM faults, or ...
    alien8r33d alien8r33d May 2010 Hardware
  • Screen display but with static noisePicked up an sold as seen speccy+ on the bay,the screen on the ebay listing was garbage but i suspect it was due to the seller using his lcd tv so ma…

    ... reason it was listed as faulty,and i received it today ... ,so could it be a faulty rf or something more sinister ... like faulty chip?,i tried the usual ...
    JACK98 JACK98 May 2010 Hardware
  • +3 FaultsI have some Spectrum +3s for testing - looks like they all need drive belts. One will not start up and shows a screen of yellowy green, then one of …

    ... . Ah I thought - maybe the ULA - the other +3's case ...
    rwap rwap May 2010 Hardware
  • Re-inventing the wheel......TROOPER: POINT 5 First an apology, my level design sucks (well I'm not happy with it) so Trooper is taking an age to do. Anyway this game comes …

    ... , I ws thinking of a ULA+ version but the loading screen ...
    BiNMaN BiNMaN May 2010 Development
  • Why only 2 colors ?Maybe this question dont go on this part of the forum, but dont know what other part to ask. Why the Spectrum only can show 2 colors at time in the …

    ... memory. Maybe not the same ULA ?

    Do you really ...
    arfgh arfgh June 2010 Sinclair Basic
  • So you need to double (or triple, or quadruple) the clock speed...No particular reason for posting this, other than I was looking at an eZ80 evaluation board that does this, and that jogged my memory of a project I'…

    ... 14MHz clock that drives the ULA... so I think for anyone ...
    Winston Winston June 2010 Hardware
  • Spectrum+ keyboard templateExist some images that help us to build the keyboard part that always is faulty on the Spectrum+ ? I need to build at least two, but of course i nee…

    Exist some images that help us to build the keyboard part that always is faulty on the Spectrum+ ?

    I need to build at least two, but of course i need the templates.

    thx in advance
    arfgh arfgh June 2010 Hardware
  • Hypothetically....If you were putting together a "Spectrum +4" what presently available hardware would you include. My criteria would be total comparability (or as ne…

    ... a single chip or new ULA's, extra RAM or anything ...
    ADJB ADJB June 2010 Hardware
  • VCF report and photosNot sure where to put this, exactly...but here it is, what went on at the Vintage Computing Festival at Bletchley Park last weekend. Finally I've fo…

    ... and faithful to the 48K ULA - all the timings and other ... effects of the ULA are the same.

    Winston Winston June 2010 Sinclair Miscellaneous
  • RFC: ZXI hardware interface standardisationReposted from c.s.s to reach a wider audience [QUOTE=Andrew Owen] You may have noticed that there are more people making add-ons for the Speccy than…

    ... how bad it is, the ULA uses 32768 ports. Most of ...
    guesser guesser June 2010 Hardware
  • Summer express game competetionHello to all. I would like announce SUMMER EXPRESS GAME COMPETETION: [B]Theme:[/B] a game [B]Deadline:[/B] 1st September 2010 [B]Target:[/B] ZX Spe…

    ... :[/B] ZX Spectrum 48 + AY (ULA+ allowed)

    [B]Rules ... is 48K zx with AY (ULA+ allowed)
    5) Basic, authoring ...
    Fikee Fikee June 2010 Development
  • LDIR timings in contended RAM?The 48K Spectrum technical reference page ([URL="http://www.worldofspectrum.org/faq/reference/48kreference.htm"]here[/URL]) describes the detailed ti…

    ... have to wait for the ULA to release the wait state ... ]next[/I] gap in the ULA wait states before it can ...
    ajmoss ajmoss June 2010 Development
  • DivIDE with gray +2 LOAD not workingI have 128+2 gray. It has faulty upper memory. PEEK 23733 shows 191. I wanted to use divIDE to load some test programs, but it always hangs when exec…

    ... 128+2 gray. It has faulty upper memory.
    PEEK 23733 ... not only memory can be faulty but also some lines.
    kpuchatek kpuchatek June 2010 Hardware
  • RGB to VGA convertor for ZX128/+2/+2A/+3David Luftner release source code (VHDL) of SCANDOUBLER for ZX128/ZX128+2/+2A/+3: [url]http://velesoft.speccy.cz/other/scandoubler-for-zx128_fixed_by…

    ... .4690 MHz from ZX board. ( ULA chip use 17.7345 MHz ...
    velesoft velesoft July 2010 Hardware
  • Issue 2 issue (...)Just acquired an issue 2 Spectrum 48 K, selled as working board, not working keyboard. Before testing it with a psu I opened the case and discovered …

    ... on z80 side facing the ula) just at the transistor plastic ... Service Manual that, related to ula 5c112 timing problems, speaks about ...
    Cignale Cignale July 2010 Hardware
  • Picture interference on red areas.I recently got a 48K Speccy off eBay, did a composite mode and it seemed to work OK, but then my TV had to go off for repair so I didn't use it for a…

    ... faults, e.g. an aging ULA or other components?
    joefish joefish July 2010 Hardware
  • Developing on Linux (Ubuntu 10.04)Ok, so I decided to install Ubuntu as my main OS, but keep XP as a bootable partition just in case I err mess up Ubuntu, :) I also have XP VM in Virt…

    ... even though I had some faulty hardware on my laptop lol ...
    polomint polomint July 2010 Development
  • ZX ULA Book releaseThe book is complete and with the printer. Once the proof copy is back and checked, and assuming no changes are required, I'll start shipping all you…

    The book is complete and with the printer.
    Once the proof copy is back and checked, and assuming no changes are required, I'll start shipping all your pre-orders.

    It's been an effort like no other I've experienced!

    To keep ...
    csmith csmith July 2010 Sinclair Miscellaneous
  • New stereo audio board for fitting on AY chip - interested?Hi, I developed a small board that fits on the AY chip inside 128K ZX Spectrums: [IMG]http://www.benophetinternet.nl/hobby/vanmezelf/stereo_audio.j…

    ... beeper sound right off the ULA or from the sound output ...
    bverstee bverstee August 2010 Hardware
  • Things I'd ask Chris Smith if he would give an interview about his book and researchGiven your current knowledge about the ULA interns, knowing what technology was capable to do those days, and knowing what people then and now would …

    ... your current knowledge about the ULA interns, knowing what technology was ... been possible using the same ULA model? In other words, would ... sprites, fit into a 6C001E ULA device? Did Altwasser push the ... ULA to its limits? Have you ...
    mcleod_ideafix mcleod_ideafix August 2010 Hardware
  • Spectrum hangs upWhat might be problem when my ZX Spectrum 48K (rubber keys) hangs up after few minutes play? It had memory problems but i changed (or an expert did i…

    ... that everything is OK. Also ULA is OK (i tested it ...
    lillaolle64 lillaolle64 August 2010 Hardware
  • Help with a zip problemI've downloaded a large file, in many zip parts (.zip, .z01, z02, etc), and the archived file (in the zip) is reported as corrupt when I try to unarc…

    ... report which file(s) is faulty, just tell me that the ...
    ewgf ewgf August 2010 Chit chat
  • Help and Advice with DivIDE PlusHi Guys, Really struggling to get any reliable actiivty with my DivIDE Plus and am looking for some pointers. I am trying to get it to work with on…

    ... tell which Spectrums have a faulty M1 bus line? Is it ...
    BloodBaz BloodBaz September 2010 Hardware
  • The Sadness of my Decaying Speccies.I've been avidly collecting ZX Spectrums since the late 90's and whilst at the time of the late 90's and early millennium my Spectrums and associated…

    ... to custom chips like the ULA when they get old? Will ...
    Scottie_uk Scottie_uk September 2010 Sinclair Miscellaneous
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Latest Posts

  • European Software Titles with an English version
    harriusherbartio on 12:06PM
  • How Do You Categorize Your Speccy Software and Games?
    harriusherbartio on 11:21AM
  • Fixed Speccy Software. And which games remained unfixed?
    harriusherbartio on 11:01AM
  • I am currently watching.....
    Paradigm Shifter on 12:49AM
  • New video about S-video modification on Issue two 48K Spectrum.
    Renegade on April 21
  • Happy 40th Birthday to the Amstrad CPC464!
    rich_chandler on April 21
  • Another Birthday! The Game Boy Is 35!
    mel the bell on April 21
  • Elusive Strategy Games done by the Smaller or less Prolific Software Houses.
    harriusherbartio on April 21
  • 1992 Spectrum Software
    harriusherbartio on April 21
  • +3 Disk drive motor
    AndyC on April 21

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