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<1…21222324252627…34>
  • I feel they could have done this.After reading the ZX Spectrum ULA, I learned about how the ULA detects if the Z80 if going to access memory in the next cycle and stops it if the ULA…

    ... stops it if the ULA also wants to. Thinking ... contended.
    Alternatively, the ULA could provide some interface between ... memory, so that the ULA can read whenever it ... CPU's perspective, the ULA is a "write only" ... not write to the ULA too often (that buffer ...
    wilsonsamm wilsonsamm August 2015 Hardware
  • Interface 1 repair?Can the Interface 1 be repaired? The problem is that it is not recognised by (several) Spectrums, including ones that it worked on the last time I t…

    ... activity.
    Is this a ULA issue in the interface?
    Paul-J Paul-J August 2015 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 engineers ... make an exact copy of ULA and as so, there are ...
    brian-82 brian-82 August 2015 Hardware
  • Bit of cosmetic surgerySince my +2's ula gave up loading tapes I decided to get rid of the redundant cassette deck and give the speccy a make over, using some silver wheel …

    Since my +2's ula gave up loading tapes I ...
    madvanman madvanman August 2015 Sinclair Miscellaneous
  • [NEW] Retro Virtual Machine v1.0.0 for OSX released!!!!Here it is! Retro Virtual Machine v1.0.0 RELEASED!!!! Many thanks first to Patrik Rak for the PZX format and for their Z80 tests without which RVM…

    ... to pixel accuracy in the ULA emulation.

    Tape emulation ...
    jcgamestoy jcgamestoy September 2015 Emulators
  • Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …

    ... video modulator ripped out , the ULA and ROM missing as well ...
    harriusherbartio harriusherbartio September 2015 Hardware
  • Help: Not loading anythingBought a ZX Spectrum +, having some problems with it. The ear is not working at all, not even a searching tone (not sure of the correct terminology) …

    ... the IC1 (which is the ULA), this means a useless spectrum ...
    Van_Dammesque Van_Dammesque September 2015 Hardware
  • 48k not startingHi team, I have 2 48k's, one works (Issue 4s), one doesn't (Issue 4a). The non-working one appears to start, but not finish the RAM test. The pape…

    ... don't get warm, although ULA and CPU do... Is this ...
    neillsun neillsun September 2015 Hardware
  • Replacement speakers for 16/48K SpectrumsThought I'd share a source of replacement speakers for the 16/48K machines: http://uk.rs-online.com/web/p/miniature-speakers/7903975/ (Equivalent…

    ... are driven directly from the ULA (no TR7), so if fitting ... series to avoid loading the ULA ear/mic pin too much ...
    balford balford September 2015 Hardware
  • New version emulator ZEsarUX 3.1Hi I have uploaded a new version of my emulator ZEsarUX on http://sourceforge.net/projects/zesarux I have improved accessibility support, no…

    ... --quickexit

    Fixed Inves ULA Colour Delay. It only affects ...
    chernandezba chernandezba October 2015 Emulators
  • I recapped my 128K toastrack, installed stereo kit and detached audio from video, but...Hello fellow forumers! I'm seeking for help: I've finally decided to change all electrolytic capacitors of my 6U (with all Panasonics 105oC)... Af…

    ... of the stereo kit to ULA pins 34 and 35 was ... sure I didn't heat ULA much. However I may heated ...
    geosiou geosiou October 2015 Hardware
  • My Games and KeymapsI have made available keymap files for all of my game plus re-built a few to support ULA plus (because the Vega uses that and it made a few of them l…

    ... -built a few to support ULA plus (because the Vega uses ...
    Paul-J Paul-J October 2015 Vega
  • Wanted 6C001E-7 ULALooking to replace mine from a issue 4B, anyone got a working one spare in a bag of bits or know where I can get one?

    Looking to replace mine from a issue 4B, anyone got a working one spare in a bag of bits or know where I can get one?
    lesoleil70 lesoleil70 November 2015 Wanted
  • No contended memory?Sorry if this is a stupid question. But I'm trying to learn more about the ZX Spectrum. If I had a stock 48k Speccy and I could wave a magic wa…

    ... />
    For example, if the ULA could grab an entire scan ...
    cbmeeks cbmeeks November 2015 Development
  • Issue 3B woesHello there, I currently have a Issue 3B for repairs around, it used to have broken upper and lower RAM, which I replaced with 41256-120 DRAMs (hac…

    ... computer, issue persists when swapping ULA & CPU.

    Any ...
    Shockwav3 Shockwav3 November 2015 Hardware
  • New Game: R-Swype Reloaded[img]http://s10.postimg.org/sldc6znah/rswype_preview.png[/img] Heavily reworked version of the 2013 css crap game entry, originally written for th…

    ... will work on any decent ULA+ emulator. Keyboard and joystick versions ...
    daveysludge daveysludge December 2015 Brand new software
  • Spectrum +2A floating bus portHi As I discovered in the past, Spectrum +2A (and probably +3) do have floating bus port. But it is not shown on all unused ports, only on some po…

    ... have the byte that the ULA reads
    (with bit 0 ...
    chernandezba chernandezba January 2016 Hardware
  • Question of contentionI'm not desperate to go digging through technical descriptions in depth, but one thing bugs me about the Speccy's video contention model - and that's…

    ... the amount of data the ULA is extracting from the RAM ... .

    So can the ULA access memory faster than the ... pixels, not 8, so the ULA must be fetching 4 bytes ... />
    So why does the ULA appear to fetch data in ...
    joefish joefish January 2016 Hardware
  • Bizarre ZX Spectrum faults (also possibly relevant to Spectranet compatibility problems).I'm attempting to repair an issue 4A 48K ZX Spectrum and am encountering some very strange problems. For my own records I've given this computer the …

    ... /> I tried another 6C001E-7 ULA, taken from a working issue ... perfectly when fitted with the ULA from ZX285.

    I ... so long as a Spectrum ULA is not faulty, it has ...
    Zorn Zorn February 2016 Hardware
  • Fixing broken link on arkanoid pagehello the link on this page: http://worldofspectrum.org/infoseekid.cgi?id=0000255 for "Super Noid Christiaan Kras 2002 PC/Windows in progres…

    hello

    the link on this page:

    http://worldofspectrum.org/infoseekid.cgi?id=0000255

    for "Super Noid Christiaan Kras 2002 PC/Windows in progress (link dead?)"


    links to: http://www.div-arena. ...
    MikeDX MikeDX February 2016 Updates
  • New version emulator ZEsarUX-4.0Hi I have uploaded a new version of my emulator ZEsarUX 4.0. You can download it from the project web page: http://sourceforge.net/projects/…

    ... Redefine keys setting
    Added ULA early/late timings setting
    ULA" book
    Fixed cursor keys ...
    chernandezba chernandezba March 2016 Emulators
  • Non working issue 3BGuys Hope you can help me here (or maybe, someonene from Europe could take a look at it? I've already tried different ULA, CPU, ROM and low RAM (…

    ... /> I've already tried different ULA, CPU, ROM and low RAM ...
    mRqS mRqS April 2016 Hardware
  • So for my first trick...I'm sure people have already used the AD724 or AD725 on other 8 bit machines, and i know the Harlequin uses the 724, but not seen anyone trying to us…

    ... the output straight off the ULA, bypassing the TEA2000 completely. The ... from pin 1 of the ULA.

    Output should be ...
    Peter Mulholland Peter Mulholland April 2016 Hardware
  • ZX Diagnostics v0.33 releasedHi everyone, I'm pleased to announce the release of v0.33 of zx-diagnostics. This release contains the following changes: - ULATest: Detect …

    ... />
    - ULATest: Detect and show ULA type, and new TR6 check ... : New addressing test - check that ULA does not respond to OUT ... joysticks to select test card/ULA test as well as soak ...
    balford balford April 2016 Hardware
  • +2 Gray ProblemI'm trying to repair a +2 gray that behaves differently at every boot up. Some rare times I can get the selection window but pretty soon the characte…

    ... /> I already tested a new ula but problem didn't go ...
    gtsamour gtsamour May 2016 Hardware
  • Issue 4A, tests complete fine but get odd crashing problemHi all, I've got an issue 4A which has had all of its lower RAM replaced, TR4, TR5 as well as its CPU. It originally had quite high voltages (20-3…

    ... tried swapping the CPU and ULA with a known working machine ...
    Jet5y Jet5y May 2016 Hardware
  • Which Is The Best Breakout?: Tonic Tile (ST) vs Giganoid (Amiga)Well last months "Which Is Best?" saw Speedball go against Speedball 2, in the end it was Speedball 2 that one the battle,...BUT it wasn't a landslid…

    ... (ST) vs Giganoid (Amiga),...no Arkanoid votes please ;-)

    All ...
    ZEUS ZEUS June 2016 Chit chat
  • ZX81 working ULAAnyone got or a reproduction they'll part with ?

    Anyone got or a reproduction they'll part with ?
    lesoleil70 lesoleil70 June 2016 Wanted
<1…21222324252627…34>

Latest Posts

  • European Software Titles with an English version
    harriusherbartio on 12:06PM
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    harriusherbartio on 11:21AM
  • Fixed Speccy Software. And which games remained unfixed?
    harriusherbartio on 11:01AM
  • I am currently watching.....
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    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
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  • +3 Disk drive motor
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HitBox

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ula 7.3K 13K

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