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<1…24252627282930…34>
  • 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
  • New version Emulator ZEsarUX-1.0Hi I have uploaded a new version of my Spectrum/ZX80/ZX81 emulator. This is a major stable version, with real timing for all the models and with hi-…

    ... memory, snow in border, colour ula delay, interrupt starts at video ... option to view CPU & ULA registers
    Added option to ...
    chernandezba chernandezba May 2014 Emulators
  • Spectrum items for saleI have many Spectrum items like Spectrum, Spectrum +, power adapters, Centronics Interface, Kempston Interface, Light Pen Interface(these are built b…

    ... they will still work), some ULA's,Z80 CPU,membranes, some ...
    techiecal techiecal May 2014 Sales
  • Spectrum+ keyboard issueHi I have a spectrum+ (issue 4s board) where the 1-5 keys do not work. I have replaced the membrane and checked for continuity. I have also tested …

    ... /> I have also swapped the ULA for a known woking one ...
    acsi acsi June 2014 Hardware
  • 48K keyboard issue48K issue 3b reads keys without... keyboard. Looking at recorded keys, problems seems to be with one data line - D1. It happens after a while since p…

    ... since powered. I will swap ULA, but any other ideas ?
    kpuchatek kpuchatek June 2014 Hardware
  • cause of 1 tstate differencethe sinclair faq, located at: [url]http://www.worldofspectrum.org/faq/reference/48kreference.htm[/url] says: "NB: Investigations in May 2004 have rev…

    ... with the same model of ULA. Some machines use the timings ... understood."

    After digging ULA for 10 years, I hope ...
    Arda Arda June 2014 Hardware
  • Microdrive-Microdrive incompatibility?Hi All! Finally I could get enough Microdrives and connecting blocks (or cable replacement) to make the largest storage configuration of the classic…

    ... the microdrives to check the ULA version/manufacturing date or the ... ISS4 board with LA15-302 ULA and edition 2 ROM. (the ...
    jimre jimre June 2014 Hardware
  • ZXDS 1.3.0Hello, I am really glad I can announce one more [URL="http://zxds.raxoft.cz"]ZXDS release[/URL] on this special day. The major new feature is the lo…

    ... feature is the long-demanded ULA+ emulation, which required way more ...
    Patrik Rak Patrik Rak July 2014 Emulators
  • Bypassing bits of faulty ULAs: the LOAD!Hi everybody, Recently I had a sick Spectrum sent to me. The symptoms were that the machine would run fine, except that it wouldn't load. The border…

    ... are probably thinking "Argh! The ULA has gone!". And indeed, ... . When I plug the ULA into a working machine, ... to stop us bypassing the ULA altogether? So I did. ... tape input instead of the ULA's pin (by which ... buffer enable back to the ULA pin 33 again (otherwise ...
    Spirantho Spirantho July 2014 Hardware
  • Differences between 128k+ and +3 RGB video circuitsHello, Have a bit of a dilema with some strange video results on my +3. Here's my setup: I have a RGB Scart to Component converter that is hooked up…

    ... /> When using my Speccy 128k+ heatsink model Picture and colors are ... are there between the 128k+(heatsink) video RGB and the Spectrum ...
    thomas3120 thomas3120 July 2014 Hardware
  • Toastrack refurbishmentYesterday I opened a drawer in my old desk and discovered 2 complete toastrack 128s and a board only for the same. As I already have a fully working…

    ... + case and adding a makeshift heatsink, unless anyone has another idea ...
    jamorski jamorski July 2014 Hardware
  • The ULA6C001E-5...Hi everybody, I have been continuing my Quest for the Holy ULA, and have today taken delivery of a ULA6C001E-5. Now, the -6 was used in Issue 3 boar…

    ... my Quest for the Holy ULA, and have today taken delivery ...
    Spirantho Spirantho August 2014 Hardware
  • 5v reg replacementHi all, Have been playing with one of my Issue 2 Spectrums and decided to replace the 5v regulator & heatsink with this wee switching reg I had lyin…

    ... replace the 5v regulator & heatsink with this wee switching reg ...
    IanJ IanJ August 2014 Hardware
  • Great to be back....and with fun to comeHi all, 1982: I bought a new 16k issue 2 in 1982, eventually got microdrives and a dktronics keyboard (version 1). Built a home made eprom programme…

    ... mount parts (except for the ULA which will be the original ...
    IanJ IanJ August 2014 Announcements
  • Question for ZX81 GurusI have an ISSUE 1 ZX81 with a 2C184E ULA. If I ever need to change it, can I use one of the newer 2C210E ULAs? If I can, are there any other mods th…

    I have an ISSUE 1 ZX81 with a 2C184E ULA. If I ever need to change it, can I use one of the newer 2C210E ULAs?

    If I can, are there any other mods that need done at the same time for it to work?
    rune rune August 2014 Hardware
  • IO Ports (Spectrum)Hi all, Working on a new Spectrum interface card I have the prototype powered up and basically working.......but I want to play with the IO addressi…

    ... they are used by the ULA and the zx printer.......so ...
    IanJ IanJ August 2014 Hardware
  • Spectrum Issue 2 - TR6 ReplacementI've just got my hands on an Issue 2 ZX Spectrum, that needed some repairs. The picture quality after doing a composite modification was pretty shodd…

    ... addresses a problem with the ULA but nothing more specific.
    retrogamemart retrogamemart August 2014 Hardware
  • Short Circuit Damage?Hey Spectrum fans, Currently trying to diagnose what is wrong with my 48K Issue 4B ZX Spectrum. The initial problem was the fact it would not boot -…

    ... message.

    Testing the ULA in another Spectrum board showed ... the ULA worked fine.

    I ...
    Tekno Venus Tekno Venus August 2014 Hardware
  • Best version of SE Basic for use in real 48K machineAs title really. :) I did a search but I'm still confused a bit. :( I've seen a few versions, namely 'SE Basic 0.80a' which has the nice 'bar' abov…

    ... to do away with the heatsink ? I mailed for one but ...
    spider spider August 2014 Hardware
  • Better arrangement for video memory?While doing some documentation work for the ZX-Uno project, I compared the advantages of the weird layout of the ZX Spectrum against a linear layout.…

    ... , what would happen if the ULA would have arranged the display ... performs better than the original ULA layout, at least for displaying ...
    mcleod_ideafix mcleod_ideafix September 2014 Development
  • My attempt to restore the CPU clock signalI know Winston has already got this, but I can't see any thread with details about it. Only wanted to share my (still early) results. I'm not taking…

    ... signal, filling the gaps where ULA stops it, and yet, maintaining ... in sync with the internal ULA and the CPU, without relying ...
    mcleod_ideafix mcleod_ideafix September 2014 Hardware
  • 48k - Why Won't it Buzzzz?Hi WOS ;) I bought a load of Spectrum games off eBay and thrown in for good measure was a 48k 1984 Issue 6a circuit board that I was told was for sp…

    ... ; bars). I've placed the ULA, ROM and Z80 in other ...
    retrogamemart retrogamemart September 2014 Hardware
  • Video fault on issue two ZX boardI've trawled the Internet and drawn a few blanks as to where to look to resolve the fault with my issue two board. I'm hoping a few of you knowledgea…

    ... I hope means that the ULA is all okay. The board ...
    Wiggs Wiggs September 2014 Hardware
  • 48K misplaced coloursHello to everybody! Slowly recapping a otherwise working Issue 6A 48K. All new caps aroud LM1889, 7805 and DC-DC converter, which improved ripple an…

    ... . Still have to change C28 (ULA smoothing capacitor). However, there are ...
    Falco-F8L Falco-F8L September 2014 Hardware
  • Spectrum sometimes boots with graphic issuesA while ago, my Spectrum 48K (issue 3B) broke down after fiddling with a brand new joystick interface in combination with DivIDE. Today I tested the …

    ... />
    I tried to swap ULA with my otherwise broken Spectrum ...
    carlsson carlsson September 2014 Hardware
  • Wanted: ZX81 caseJust found my old Issue one ZX81, ULA type 8120 (no other markings on the chip). Looking for a case to put it in and hopefully restore to full worki…

    Just found my old Issue one ZX81, ULA type 8120 (no other markings on the chip). Looking for a case to put it in and hopefully restore to full working order.

    Cheers guys
    DEATH DEATH September 2014 Wanted
  • QL microdrive units (x2)Found two old microdrive units I ripped out of a QL many moons ago. Just the bare units, no fancy cases etc. I have NO idea if they're any use for …

    ... if they work.

    ULA 2G007E, 8344 date code on ... one, ULA 2G007E date code 8348 on ...
    DEATH DEATH September 2014 Sales
  • Issue 6 repair with a twist...(Starting with a slight grump - the forum ate my first attempt at this so this'll probably end up being a bit terse :)) I got a Issue 6 48K machine …

    ... I started wondering whether the ULA was flaky, or if there ...
    balford balford September 2014 Hardware
  • JHCon 2014Hello, not sure if this is the right category but JHCon 2014 will take place[B] from 28. to 30.11.[/B] at usual place - gymnasium in Jindrichuv Hrad…

    ... modes of TC2048/2068 PAL ULA
    --- add a proper Basic ...
    Factor6 Factor6 October 2014 Announcements
  • Weird symptom number 2...I got a new keyboard membrane for my Spectrum+ plugged it in and low and behold the weird left to right printing of the copyright message disappeared…

    ... tests passed, keyboard, RAM, ROM, ULA, IRQ etc.

    After ...
    Korinel Korinel October 2014 Hardware
<1…24252627282930…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
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    John Elliott on April 21
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    rich_chandler on April 21
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    mel the bell on April 21
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  • +3 Disk drive motor
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