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<1…21222324252627…34>
  • a few questions1. When will emulators use pc vga capabilities to emulate the uhf tv output accurately including phosphoric delay and crosstalk synchronization 2. W…

    ... hardware interlace like the spectra ula+ or zx prism

    morcar morcar November 2013 Sinclair Miscellaneous
  • Tricky ZX RepairHello guys, This time I put my hands on a very nice Issue 3 16K, upgraded to 48K. To bertter explain "nice", it is absolutely mint, not a scratch on…

    ... .

    Hmmmm... swapped the ULA, but it also worked perfectly ... puzzled. Apart from ROM and ULA, there's nothing else on ...
    Falco-F8L Falco-F8L December 2013 Hardware
  • Black Screen Spectrum 48kWas working ok, it came to me in a Fuller FDS keyboard, I had a nose inside and found a floating power lead connected to the keyboard, I removed that…

    ... />
    Update: Tried another working ULA and it's not that ...
    OttO OttO December 2013 Hardware
  • I'm rich! (not really)In the post today, as well as the odd Christmas card, was a letter purporting to be from a Mr Zhang at China CITIC Bank (a real person working at a r…

    ... 's own email domain. A typical "I'm writing to tell ...
    Battle Bunny Battle Bunny December 2013 Chit chat
  • Interesting 48K failureI thought I'd recount a failure I've not seen mentioned before that I saw tonight while fixing a 48K issue 6 board. The background: The initial fail…

    ... the Z80.
    3. Intermittent ULA fault (easily testable - since the ... IOREQ high thus preventing the ULA from seeing odd numbered I ... was never fixed inside the ULA - TR6 instead became part of ... an NMOS output), causing the ULA to sometimes see spurious IO ...
    Winston Winston December 2013 Hardware
  • MISTER BEEP - the NEW ZX48 album 2014 "Chromospheric Flares"Hi mates. So. Here it is. Something like 2 years after the previous one - here is my new ZX Spectrum album "Chromospheric Flares". [img]http://mi…

    ... (jack) through 1-bit transducer - ULA chip.
    Sometimes it sounds ... of ZX SPECTRUM (jack) through ULA chip - the 1-bit transducer ...
    Mister Beep Mister Beep January 2014 Announcements
  • Using even ports for input?I've been looking for unused ports to use with my clashbasher interface. I understand that the spectrum only considers A0 when decoding its input p…

    ... socket.

    However the ULA is decoupled from the Z80 ... so the resistors between the ULA and the Z80 would be ... between the z80 and the ULA.

    As long as ...
    Basher Basher January 2014 Hardware
  • Which Windows Emulator will support SPECTRA?I want to start crossdeveloping games for SPECTRA, but it is a pain in the ass to save the TAP on USB Stick or SD Card and test them on my eMac SP Em…

    ... .html[/url]
    Everybody supports ULA+ which is still not available ...
    LCD LCD January 2014 Emulators
  • Timex Compute TC2048 loading problems solvedHi everybody, I've just finally fixed a TC2048 that had numerous problems. Once I'd changed all the RAM, the CPU and the ULA (surface mounted, for a…

    ... RAM, the CPU and the ULA (surface mounted, for added joy ... 0.7V threshold that the ULA uses to detect a tape ... .
    So, of course, the ULA just read a logic high ...
    Spirantho Spirantho January 2014 Hardware
  • Issue 2 with 5C102E + cockroach on eBay(Posted here and not sales as it's not mine :)) Came across [URL="http://www.ebay.co.uk/itm/151225493166"]this[/URL] earlier - early Issue 2 board, …

    ... 2 board, complete with 5C102E ULA and dead cockroach. Looks from ...
    balford balford February 2014 Hardware
  • Help with an issue 2Hello friends, Today, sadly, my issue 2 board lost his 5c112 ULA, and on my spares list I only had a 6c one that worked fine after swapping it. Now I…

    ... 2 board lost his 5c112 ULA, and on my spares list ...
    Pluto63 Pluto63 February 2014 Hardware
  • ZX Spectrum 48K board Issue Two - spider modI have a working Spectrum 48K Issue Two for sale on Amibay. It?s an early version with an ULA 5C102E and the "spider-mod" fitted. [URL="http://www.a…

    I have a working Spectrum 48K Issue Two for sale on Amibay. It?s an early version with an ULA 5C102E and the "spider-mod" fitted.

    [URL="http://www.amibay.com/showthread.php?t=57438"]http://www.amibay.com/showthread.php?t=57438[/URL]
    schombi schombi February 2014 Sales
  • Refactoring the ULAplus HDL descriptionFor the ZXUnio project, I'm refactoring the Verilog code I wrote two years ago to describe the ULA and the ULAplus devices. When I've taken this code…

    ... years ago to describe the ULA and the ULAplus devices. When ... it turned to be the ULA/ULAplus datapath.

    The ... modules were in the original ULA (light yellow), what modules were ... .

    This is the ULA/Timex/ULAplus datapath schematic (click ...
    mcleod_ideafix mcleod_ideafix February 2014 Hardware
  • Issue 3B suddenly goes black and whiteAnother 3B I have here had a faulty ULA, swapped that out for another and hurrah! Works! New keyboard membrane and composite mod later I load a game…

    ... have here had a faulty ULA, swapped that out for another ...
    Macc Macc February 2014 Hardware
  • ZX Spectrum 48K+ Audio out, Speaker, Volume controlI have this lovely ZX which a friend gave me kindly two years ago. I cleaned him well and after a year he stopped working, so I did a full recap and …

    ... and I bought from Ben ULA, ROM, CPU and some RAM ...
    VincentGR VincentGR March 2014 Hardware
  • Using 256 color emulator to remove color clash & update graphicsWhat are your thoughts in using 256 color emulation (like [url]http://www.emulatronia.com/emusdaqui/spec256/download-eng.htm[/url] ) but limiting the…

    ... color mode for example? Or ULA+ ?
    Simply use the ZX ...
    4throck 4throck March 2014 Games
  • Spectrum Not Responding to Keyboard InputHello, sorry if this thread is not in the correct place, This is my first post and I'm not sure where to post this type of thread. :lol: Anyway, I r…

    ... Keyboard membrane, or IC1 (the ULA chip).

    ... signs of a faulty ULA chip are. Are there ... not seen any replacement ULA chips. In the event ... cannot remember exactly what ULA is on the board however ... for a certain model ULA.) Tomorrow I will check ...
    CornishManicMiner CornishManicMiner March 2014 Hardware
  • Heatsink's for ZX SpectrumAre heatsinks usefull for the chips are used in ZX Spectrum's On eBay I saw some heatsinks for ULA's, 3 for +/- 8 dollar's. And I want to know are th…

    Are heatsinks usefull for the chips are used in ZX Spectrum's
    On eBay I saw some heatsinks for ULA's, 3 for +/- 8 dollar's. And I want to know are those usefull or useless? Will the cheaper vga heatsinks also do the job?
    Reinier Reinier March 2014 Hardware
  • Help needed with calculating screen addressesCan anyone help me finally crack Jonathan Cauldwell's screen addressing calculator and, more to the point, is the reason I'm struggling because this …

    ... /> That said, here is a typical y,x coordinate and the ...
    Jagd Tiger Jagd Tiger April 2014 Development
  • For leespoons - 'Schr?dinger'For [B]leespoons[/B] - 'Schr?dinger'. Here's the concept - a platform or maze game in the top two thirds of the screen with obstacles to negotiate a…

    ... operated. The objective is your typical gaming fayre of collecting objects ...
    joefish joefish April 2014 New game ideas
  • Totally random idea for the hardware nuts to exploreWhen it comes to multi-player games, how hard would it be to generate a second display from a single Speccy, instead of trying to link up machines, s…

    ... , based on the ideas behind ULA+ and SPECTRA. When the Z80 ... using a spare ordinary 48K ULA to turn the contents of ... Speccy cope with writing to ULA-contended memory of an external ... chippery, or just a spare ULA from a dead Speccy and ...
    joefish joefish April 2014 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…

    ... Timex-multicolour functions from the ULA+ specification[/B].

    ... we can actually get internal ULA+ upgrades, it would have ... probably be best if the ULA+ OUT commands that control the ... without much support. And yet ULA+ seems to be something people ...
    joefish joefish April 2014 Hardware
  • Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…

    ... wrong power supply as the ULA had a bit missing and ...
    Brian Brian April 2014 Hardware
  • what video leads were available for 128+toast rack at the timei just wondered if anyone knows what original video leads were available for the toast rack at the time it came out,were they sinclair or 3rd party a…

    ... safe leads that wouldnt blow ula`s or anything else up ...
    zedexspectrum zedexspectrum April 2014 Hardware
  • Toastrack key sound but no imageGot a toaster that had a bad ULA, replaced that with one out of a grey +2 (Im sure ive done this in the past and it was ok), now i get the menu up bu…

    ... toaster that had a bad ULA, replaced that with one out ...
    Macc Macc April 2014 Hardware
  • 48k no beeper sound (again!)Got three 48k+ here, all of which have the same exact problem, no sound out the beeper, same problem as detailed [URL="http://www.worldofspectrum.org…

    ... however the same solution, replaced ULA's to no avail and ... tried the original ULA's in a known worker ...
    Macc Macc April 2014 Hardware
  • Using VAC PSU in DC deviceHaving fixed the dead Issue 3B, I began to wonder about the PSU that came with it. It was pretty obvious what had killed the poor Spectrum as the PSU…

    ... and upper RAM, partially dead ULA and lifted trace from CPU.
    protek protek April 2014 Hardware
  • Yellow issue 4A keyboard madnessNote sure if this is a similar problem to the one CornishManicMiner has, but one of my yellow issue 4A boards is driving me crazy. I had it in variou…

    ... the Saga). I replaced the ULA and all was working when ...
    schombi schombi May 2014 Hardware
  • HDMI generation by cloning video ram(coming from [url]http://www.worldofspectrum.org/forums/showthread.php?p=768257&posted=1#post768257[/url]). A thing I was brainstorming about.. Why …

    ... /> No more need for a ULA ;)
    bverstee bverstee May 2014 Hardware
  • 48K: Half of copyright message in the middle of the screen?!Issue two. Has 74LS08 over the Z80, but the ULA is 5C112E-3 (I think this should be a 5C102E??? - I have one, but I'm not sure if it is working, at l…

    ... over the Z80, but the ULA is 5C112E-3 (I think ... not possible without (a) working ULA, CPU, ROM and lower memory ... added 74LS08 go to the ULA, but are loose. They were ...
    georgedb georgedb May 2014 Hardware
<1…21222324252627…34>

Latest Posts

  • I am currently watching.....
    Paradigm Shifter on 12:49AM
  • New video about S-video modification on Issue two 48K Spectrum.
    Renegade on April 21
  • Fixed Speccy Software. And which games remained unfixed?
    John Elliott 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
  • European Software Titles with an English version
    harriusherbartio 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
  • Celebrity deaths...
    mel the bell on April 20

HitBox

Word Docs Hits
typical 2.1K 2.2K
ula 7.3K 13K
faults 719 811

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