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  • Little experiment in ULA+Just tried Image 2 ULAPlus and this is the result: View it: [url]http://jbacteria.antoniovillena.es/48s?scarlett.tap[/url] Download it (you must ex…

    Just tried Image 2 ULAPlus and this is the result:

    View it:
    [url]http://jbacteria.antoniovillena.es/48s?scarlett.tap[/url]

    Download it (you must execute in a supported emulator like SpecEmu):
    [url]http://jbacteria. ...
    antoniovillena antoniovillena October 2011 Development
  • Definitive Replay Attendance List 2011There's not too long to go until Replay 2011 in Blackpool, so I thought I would make a separate thread to list WOS members who say they're going to t…

    ... of the definitive ZX Spectrum ULA book, ISBN-13:978-0 ...
    Spector Spector October 2011 Announcements
  • Improving the Spectrum +2's Cassette RecorderHi people, Nice techie question here! I have a Spectrum +2 (grey). Actually, I have several. I'm trying to get this particular one to load tapes be…

    ... />
    I looked at the schematic, and I can see the ...
    Spirantho Spirantho October 2011 Hardware
  • Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…

    ... />
    I have verified the ULA (5C112E-3) works by testing ...
    Spectrum and a working ULA from another Spectrum produces the ... back!) It does seem the ULA becomes slightly hotter than usual ... CPU and ROM
    and ULA, with the expected 470ohms resistance ...
    Zorn Zorn November 2011 Hardware
  • New ZX-ULA2An upgraded / replacement ULA for the Sinclair ZX81 is now available. The ZX-ULA2 is a direct replacement for the standard ULA used in the Sinclair …

    An upgraded / replacement ULA for the Sinclair ZX81 is ... direct replacement for the standard ULA used in the Sinclair ZX81 ... home computer.

    The ULA is a custom chip designed ...
    rwap rwap December 2011 Sales
  • Repairing another Issue 2 48K Spectrum.I said at the start of the other thread that I've got another one of these and I've started investigating it. The board is more-or-less exactly the …

    ... they were exactly the same. ULA unplugged, I applied power again ...
    Zorn Zorn December 2011 Hardware
  • ATOM HDD interface for SAM COUPEHere is original old schematic of ATOM HDD interface: [url]http://8bit.yarek.pl/interface/sam.atom/atom.gif[/url] My first ATOM: [url]http://velesof…

    Here is original old schematic of ATOM HDD interface:
    [ ...
    velesoft velesoft December 2011 Hardware
  • Faulty Interface one, IF1Dear all, as I have already mentioned in a different thread my IF1 stopped working for no special reason. I went through the service manual and chec…

    ... oscillator at pin 5 from ULA. There is 8Mhz available.
    maskenlos maskenlos January 2012 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 transistor that pulls the ULA's /IOREQ line high when ... like this or was the ULA bug corrected for the +2 ...
    Zorn Zorn January 2012 Hardware
  • divIDE x Spectrum clonesAnyone has a Spectrum clone and did a test with divIDE? Here in Brazil we have 2 Spectrum clones (TK90X and TK95) that are almost 95-99% compatible w…

    ... know that our ROM and ULA are slightly different of the ...
    Turrican Turrican January 2012 Hardware
  • Faulty rubber speccy - advice neededHello all speccy hardware gurus :) Recently I moved to a new flat and after a long time have some space (and time) to dig out my old Speccy hardware…

    ... lower ram chips... maybe even ULA...

    Of course, when ... them, and confirmed that the ULA from the faulty mbo worked ...
    deckard deckard January 2012 Hardware
  • SCRplusAnn: SCRplus 0.19, with a user-friendly GUI (based on GTK+). Converts images to ZX Spectrum format. Supports ULA+ format, Timex 8x1 attributes, YUV…

    ... to ZX Spectrum format. Supports ULA+ format, Timex 8x1 attributes, YUV ...
    AY Chip AY Chip January 2012 Development
  • Harlequin clone...PCB manufactured!Using Chris Smith's detailed schematics and project notes from the Harlequin... a Speccy fan in the United States by the name of Don (Superfo) has de…

    ... the basis for understanding the ULA, and all the timing quirks ... of the Spectrum ULA, and the later work Chris ... Smith did to produce the ULA book).

    Some pictures ...
    Winston Winston January 2012 Hardware
  • Broken +2 (Grey), need helpHello, I got a broken +2, and as I have tons of them working, I want to repair it without fear :D When I power up the machine the I see a horizontal…

    ... /> I replaced the ula first, and tested the ula on another board ...
    Arda Arda February 2012 Hardware
  • Cheetah Midi interface for ZX SpectrumHi, does anyone know how to get this hardware? [URL="http://www.worldofspectrum.org/hardware/feat36.html"]http://www.worldofspectrum.org/hardware/fe…

    ... /> or does anyone have the schematic of that interface including software ...
    ingo ingo February 2012 Wanted
  • SpiffyBecause there aren't enough emulators already... [url=https://github.com/ec429/spiffy]Spiffy[/url] is my 48k Spectrum emulator, for Linux. Right no…

    ... ]

    Right now the ULA timings aren't perfect; to ...
    AY Chip AY Chip February 2012 Emulators
  • Chaosmongers has a big rant.Just received this Cronosoft related email today:....... [quote] >Hello, >I enjoy the idea of releasing new games for older platforms but... >I h…

    ... the new technologies and add ULA+ colour palettes to the game ... games modified by me for ULA+:
    >[url]http://www ... the new technologies and add ULA+ colour palettes to the game ...
    chaosmongers chaosmongers March 2012 Games
  • My head hurtsCan't sleep. Head hurts :( I've been sitting here all night doing schematic diagram stuff in an attempt to bore myself to sleep but that's not helpe…

    Can't sleep. Head hurts :(

    I've been sitting here all night doing schematic diagram stuff in an attempt to bore myself to sleep but that's not helped.
    guesser guesser March 2012 Chit chat
  • Strange behaviour in real hardware but not in emulatorsWell, at least not in any emulator I've tried. I've been reported by fellow forum member Macc that both our Maritrini Monster Slayer and Retroworks'…

    ... problem in emulators, unlike the ULA snow effect which can be ... between $C0 and $FF, the ULA gets confused and crashes can ...
    na_th_an na_th_an March 2012 Emulators
  • Microdrive units with weak (not dead) ULAs...Hi everybody, I've got a Microdrive unit here. It didn't work. It does now (actually, it was the ribbon had broken and the ground had lost contact, …

    ... just kept spinning as the ULA never told it to stop ... .
    I also have another ULA that exhibits similar behaviour - it ... we can get this poor ULA back up to speed? Anything ... signal before going into the ULA. It's the output that ...
    Spirantho Spirantho March 2012 Hardware
  • Lot's of Sinclair parts and sparesI have really a lot spares at home, like: - ULA's - All kinds of RAM chips Many of these parts have already been tested. Most of these parts are pu…

    ... spares at home, like:
    - ULA's
    - All kinds of ...
    bverstee bverstee March 2012 Sales
  • The impossible made possibleSome years ago Miguel Angel Rodriguez Jodar and I developed the PC Keyboard Interface (still available at SellMyRetro.com). The interface however wa…

    ... are no resistors between the ULA (matrix array) and the Z80 ...
    bverstee bverstee March 2012 Hardware
  • 48K's and bad DivIDE compatibilityI have had some 48K boards and complete machines in the past which didn't work fully with a DivIDE interface. The reason for that always was a Z80 pr…

    ... .
    I also tried other ULA's, but the problem is ...
    bverstee bverstee March 2012 Hardware
  • Speccy 48K working only as B&WMy 48K rubber key was working OK after a composite video mod (showing colors). But now it has no colour anymore. It only shows images in B&W. With pr…

    ... cause this? Is a bad ULA?
    My 48K is not ...
    Turrican Turrican April 2012 Hardware
  • Spectrum 48k Issue 4S?I just recieved a Spectrum 48K that had the bottom case from an issue 1 and the top half from a later issue, and the main board is 1983 Issue 4S. I a…

    I just recieved a Spectrum 48K that had the bottom case from an issue 1 and the top half from a later issue, and the main board is 1983 Issue 4S. I am curious in what way it differs, as there are no schematic for issue 4S on this site.
    Johan1973 Johan1973 April 2012 Hardware
  • Intermittent reset on 48K (issue 4S)I'be been fighting an intermittent selfreset the whole day. Changed ULA - did not help. Tested TR6 as i could and compared the reading with another…

    ... whole day.

    Changed ULA - did not help.


    ULA temp is about 48-50C ...
    ArtemKuchin ArtemKuchin May 2012 Hardware
  • Imperica Horizons - The whole weekend :-)So now it's all over, I'll do a quick writeup... It all started for me at 5.20 am. Getting to London from Devil's Island isn't so easy now that Aer …

    ... his work on the Spectrum ULA, colour timing tricks and the ...
    Winston Winston May 2012 Sinclair Miscellaneous
  • Zx 48k after the ic7805 other problemHi everyone, i am Tiago from Portugal, and i am trying to repair a Zx Spectrum 48K. the machine didn't do anything, no image, no sound, nothing. The…

    ... do now? Is it RAM? ULA?
    how can i check ...
    tiago tiago May 2012 Hardware
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ula 7.3K 13K
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