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  • No tea vicar on MB02Hello Folks, I have difficulties in getting "More tea vicar" (the free 128k version) running on the MB02. The game starts and you can choose control…

    ... anyway an ULA corrector in my Spectrum+2, so no snow at ...
    Speccyman Speccyman December 2012 Sinclair Miscellaneous
  • Correction of +2 hardware errorsThis is a collection of various pieces of information picked up from various places, including a lot from this forum. I have edited it and reworded i…

    ... CPU for eliminate ula effect known as "screen raining / snow effect"
    ula slow-down cpu with same ...
    velesoft velesoft January 2013 Hardware
  • TKMEM - the 128K interface for 16K SpectrumsHello all! Here in Brazil, we have made a small production of an interface, totally based on Velesoft?s memory expansion ([url]http://velesoft.speccy…

    ... (incompatible with Sinclair's ULA). This ULA has been cloned with CPLD ... mode, or even the different ULA, though?) with correct timings (either ... ').
    [*] Details on how the 'snow' caused by incorrect setting of ...
    zub zub January 2013 Hardware
  • Which type of Z80 cpu to use with ZX 48?Which type of Z80 cpu can I use with ZX 48? Only the 4 MHz cpu's or some with more MHz? Did not know if a 6 MHz cpu runs in a ZX 48 with 4 MHz. Mic…

    ... can get a bit of "snow effect" if you're using ... memory being seen by the ULA when it's reading video ...
    Winston Winston February 2013 Hardware
  • The "best" Z80?What's the best Z80 for Spectrums? I know there are differences between brands (Nec, Zilog, Thomson) and technologies (CMOS, NMOS), so what Z80 woul…

    ... you may get occasional unwanted "snow effect". The output impedance of ... separation resistors enough that the ULA sees some of the Z80 ...
    Winston Winston April 2013 Hardware
  • CyberbigI found out that Cyberbig is affected by snow effect in FBZX Wii. There is snow in the all screens except in the main menu. I checked that also Spe…

    ... yet included in FBZX. Also snow effect has been improved:
    snow effect since the ULA bug was fixed in ... />
    Fuse does not emulate snow effect.

    Few emulators ...
    Oibaf Oibaf April 2013 Games
  • CyberbigI found out that Cyberbig is affected by snow effect in FBZX Wii. There is snow in the all screens except in the main menu. I checked that also Spe…

    ... yet included in FBZX. Also snow effect has been improved:
    snow effect since the ULA bug was fixed in ... />
    Fuse does not emulate snow effect.

    Few emulators ... true, I remembered that the SNOW effect was for the +2 ...
    Ivanzx Ivanzx April 2013 Games
  • CyberbigI found out that Cyberbig is affected by snow effect in FBZX Wii. There is snow in the all screens except in the main menu. I checked that also Spe…

    ... .

    The Snow effect occours when the ULA thinks that the ...
    Oibaf Oibaf April 2013 Games
  • CyberbigI found out that Cyberbig is affected by snow effect in FBZX Wii. There is snow in the all screens except in the main menu. I checked that also Spe…

    ... />
    [quote]The ULA bug which causes snow when I is set ... and this interacts with the ULA accesing to a contended bank ...
    zx81 zx81 April 2013 Games
  • Faulty 48K Issue 3 motherboardHi I have a faulty Issue 3 motherboard and would appreciate it if somebody can steer me in the right direction of where to begin with the fault find…

    ... check the RAM ic's ULA, CPU and ROM?[/QUOTE]
    snow with the Spectrum switched off ... tested the RAM IC's, ULA, CPU and ROM by plugging ...
    Pierre Pierre April 2013 Hardware
  • Games with Music BugsI know there is already a thread about games with bugs (and indeed its a awesome thread), but I thought maybe it would be nice to open another one ju…

    ... 't, they suffer from rain/snow/ULA bug/whatever you want to ...
    Jmk Jmk May 2013 Games
  • Contended Memory woes...Hello All, An iccle problem I have and was hoping one of you fine WoSers could bail me out again... :) I've noticed that my emulator is running sli…

    [QUOTE=Woody;707957]The Z80 places IR ... the address bus then the ULA continues to see IR and ...
    introspec introspec June 2013 Emulators
  • SE BasicAfter 13 years of development I thought I'd run out of things to optimize, but it turns out I was wrong. However, I'm now running out of time to work…

    ... yet to reverse engineer the ULA, so my next-generation clone ... -in replacement for the original ULA based on it (still in ... stored palette
    [*]SCROLL?text scrolling
    [*]SOUND?play the AY ...
    chev chev October 2013 Sinclair Basic
  • ULA snow effectIt's wintertime, you know. [quote="http://ramsoft.bbk.org.omegahg.com/floatingbus.html"]when the I register falls in the range 0x40-0x7F then the UL…

    ... that when Woody and I were investigating the snow effect, Woody had code ... in all columns using the snow effect.

    Although we ... . I don't know if Woody improved the emulation further in ...
    Basher Basher January 2014 Development
  • ULA snow effectIt's wintertime, you know. [quote="http://ramsoft.bbk.org.omegahg.com/floatingbus.html"]when the I register falls in the range 0x40-0x7F then the UL…

    The Snow effect can affect all columns, both odd and even from Woody's experiments which I was a witness to - we had a fullscreen attribute-level vertical scroller at one point, which was entirely unintended but looked lovely :)

    D.
    Dunny Dunny January 2014 Development
  • ULA snow effectIt's wintertime, you know. [quote="http://ramsoft.bbk.org.omegahg.com/floatingbus.html"]when the I register falls in the range 0x40-0x7F then the UL…

    ... Snow effect can affect all columns, both odd and even from Woody ...
    antoniovillena antoniovillena January 2014 Development
  • Arkanoyd 2: Revenge of DohHow hard would it be to make the ball & the ship of a different color than the back ground, and so making this game playable?

    ... from Arkanoid 1 plus the scrolling background (when you pick up ... post:
    That Rick Dangerous ULA plus screenshot looks like a ...
    XTM of TMG XTM of TMG January 2014 Games
  • We could design the LokiWouldn't it be great... if this community would develop what Sinclair himself started but was never finished: a successor of the 128K with 'cartoon l…

    ... /> Add-ons like Spectra and ULA+ are interesting as they're ... /> ZX Uno even has the ULA Plus implementation!

    [QUOTE ... "wishing" is permitted, then hw scrolling + raster IRQ :-D[/QUOTE]
    bverstee bverstee March 2014 Hardware
  • ZX Alien BreedNot sure if this has been mentioned already (I did trawl the threads but couldn't see anything :smile: ), but I've always hankered after a Speccy Ali…

    ... see any problem in using ULA+ with it, as you can ... /> So you could do smooth scrolling with no color clash, IF ...
    4throck 4throck March 2014 New game ideas
  • Space Harrier new loading screenHi, The original screen: [IMG]https://dl.dropboxusercontent.com/u/2616449/spectrum/SpaceHarrier.png[/IMG] and my new version: [IMG]https://dl.dro…

    ... ? was to used sprite-specific scrolling routines, which would only change ... a version for the original ULA to go with the screenshot ...
    zub zub April 2014 Games
  • Fuse 1.1.1 releasedOn behalf of the Fuse team, I am pleased to announce the 1.1.1 release of Fuse. The changes from the recent 1.1.0 are relatively minor, mostly correc…

    ... is part of the ULA and the ULA is contended.

    ULA+ ports...[/QUOTE]

    Well ... the contention would be. Although Woody guessed it correctly. Given that ... plug-in board and because Woody used the 48 timings instead ...
    chev chev May 2014 Emulators
  • Spectrum screen layoutSeeing the thread on displacement I was wondering why the spectrum had the stupid screen split into three sections and the addresses for each section…

    ... book, 'The ZX Spectrum ULA: How to Design a ... of the CPU or a 'snow' effect on screen). A ... CPU completely whilst the ULA is drawing the pixel ... When drawing the screen, the ULA reads four bytes of memory ... constraint imposed by the ULA and the DRAM refresh ...
    zub zub May 2014 Sinclair Miscellaneous
  • 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 ;)[/QUOTE]

    Well, that ... could detect OUTs and mimic ULA plus palette and multicolour, and ... step with the 50Hz refresh, scrolling games like Cobra and Hysteria ...
    joefish joefish May 2014 Hardware
  • Test screens for ZX PrismNot sure that this is *really* the right section for this request, but it's relating to new hardware I'm developing so let's start it off here - a mo…

    ... enhancement to get working, after ULA+ palettes, is hardware multicolour ... QUOTE]

    ULA+ palettes will come later after ... Between that time and ULA+'s specification being finalised ...
    Features like hardware scrolling are interesting ideas, and I ...
    JeffB JeffB July 2014 Hardware
  • Worst purchaseThere's a lot of talk about the bestest games out there but which one was your worst purchase? I bought Barbarian II for the princely sum of ?10 (a …

    ... would maybe benefit from a ULA+ makeover to separate out some ... visibility problems. Although the character scrolling would still be quite choppy ...
    joefish joefish November 2014 Games
  • Detecting flash mode inversionsIs is possible to detect with certainty when flashing characters change from normal to inverted and vice-versa?

    ... to find which state is ULA in :) Can't we force ... ula to make a mistake and ... about it's internals? Like snow? floating bus?
    Arda Arda November 2014 Development
  • Timing_Tests-48k_v1.0 results...Hello All, I ran these [URL="http://www.zxspectrum4.net/op_timing.php"]tests[/URL] on my emulator and some of the tests failed.. so I tried it on a …

    ... passes both Timing test and Woody test suite, with zero errors ... ..

    Here's what Woody said about it:
    [url ... features is support for undocumented ULA artefacts (four bright shades), which ...
    Pegaz Pegaz November 2014 Emulators
  • 128K Spectrum - can't figure out what's wrongLong time no post :) So I have this 128K Spectrum (+2 ROMs) that I cannot for the life of me figure out where the problem lies. Let's take a look a…

    ... for the pin contacts, the ULA is sitting in 2x24pin turned ... I power-cycled), not showing snow, ROM data, etc.

    Phu Phu December 2014 Hardware
  • ZXMAK2Hi everyone, I'm glad to present you the latest version of my emulator - ZXMAK2 :) There are a lot of changes were made since the last topic about t…

    ... length for Spectrum 48 late ULA;
    - added beeper DAC/MIC ... the SpecEmu, which supports undocumented ULA behavior (ULA artefacts option), such as ... some resample filter for smoother scrolling experience at 60hz refresh rate ...
    Pegaz Pegaz February 2015 Emulators
  • Emulator refresh ratesOkay, I'm going to ask a really lame, beginner question ;) Zx Spectrum refreshes screen 50 times per second. I'm running emulator on PC which says …

    ... be processing the Speccy's ULA rendering of the screen at ... last one, which will blur scrolling but mainly reduce the flicker ...
    joefish joefish February 2015 Emulators
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