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Search Again :: Adv Search 1000 results in 0.014s
<1234567…34>
  • Exact emulation of the Snow effectAs the original post on another forum is outdated, and for those who don't know about that forum, I duplicate this info here: At the beginning of …

    ... the snow effect: at 16/48/128/+2 machines snow appears if register I ... a question of register R's participation in the snow effect.

    snow effect you need to make sure that the register I ...
    weiv weiv October 2022 Emulators
  • ULA RAS, CAS cycles, refresh and "snow effect"Hello everyone. I have a question, does anyone observed timings of RAS and CAS generated from ULA? I think there may be answer to where the "snow ef…

    ... be answer to where the "snow effect" comes from.

    I ... be 2 reasons for that effect:
    [LIST=1]
    [*]The ...
    brian-82 brian-82 November 2007 Development
  • ISR's in lower ram, a.k.a. the snow effect - did any game or demo ever use this?Hi all I've been curious to see what the 'snow effect' looked like in real life for a while now so today I wrote a quick IM 2 ISR in lower ram to wi…

    ... curious to see what the 'snow effect' looked like in real life ... for any kind of special effect or similar? I'm certainly ... ="http://homepage.ntlworld.com/cmonkey/snow.jpg"]Snow[/URL]
    [URL="http ... /matrix.jpg"]Green on black snow[/URL]

    [URL=" ...
    cmonkey cmonkey January 2012 Games
  • ULA bug and snowI am tryng to improve the snow emulation in FBZX wii but I do not have a real spectrum to test the results. I used the information taken from Harele…

    ... am tryng to improve the snow emulation in FBZX wii but ... writing in the ULA video register the second screen byte it ... cycle and if the I register is between 0x40 and x7F ... byte the value of R register.

    This emualtes the ...
    Oibaf Oibaf August 2012 Emulators
  • 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…

    ... /floatingbus.html"]when the I register falls in the range 0x40 ...
    A7-A0 = the R register of the Z80

    effect based on that [url=https ...
    Hikaru Hikaru January 2014 Development
  • MB02+ software and system developmentsThe following text was (before last modification) first published here: [url]http://www.sintech-shop.com/forum/board.php?boardid=20[/url] As discuss…

    ... RESIDOS:

    ULA snow effect (screen raining) is active on ... 128/+2(grey) if register I is set to same ... don't snow, and more russian games use register I set ... you can detect if register I is set to ... . This games crash on +2A/+3. If register I is set ...
    velesoft velesoft April 2008 Development
  • MB02+ software and system developmentsThe following text was (before last modification) first published here: [url]http://www.sintech-shop.com/forum/board.php?boardid=20[/url] As discuss…

    ... in RESIDOS:

    ULA snow effect (screen raining) is active on ... /48/128/+2(grey) if register I is set to same ... ZX48rom. This games crash on +2A/+3. If register I is set ...
    glancaster glancaster April 2008 Development
  • 48K games that don't work on a +2Not sure if there is already a thread about this but recently I've noticed some old 48K games will not run on my +2 - even in 48K mode. Examples are…

    ... routines will lead to a crash. The only way around ... $5C3B) will cause a crash even in 48 mode?[/I ... the 'snow' effect (setting I register between $40 and $7F) will crash a ... ROM is likely to crash on a different 128 ... issues, not really a crash. RAM pages 4-7 ...
    Jimmy Jimmy June 2008 Games
  • 48K games that don't work on a +2Not sure if there is already a thread about this but recently I've noticed some old 48K games will not run on my +2 - even in 48K mode. Examples are…

    ... the 'snow' effect (setting I register between $40 and $7F) will crash a 128 ... I have never seen the snow effect occur ever. (I have seen ...
    thingley thingley June 2008 Games
  • 48K games that don't work on a +2Not sure if there is already a thread about this but recently I've noticed some old 48K games will not run on my +2 - even in 48K mode. Examples are…

    ... the 'snow' effect (setting I register between $40 and $7F) will crash a 128 ... also possible to crash a 48K machine with the snow effect. But hey ...
    Bob Stains Bob Stains June 2009 Games
  • Games that crash because of contended memory.I find these are really annoying. You load up a game like Astro Marine Corps, Fantasy World Dizzy, Dizzy: Prince Of The Yolkfolk and so on (the init…

    ... hardware that causes a crash when the I register points into contended ... 3. I can see the snow effect but without other problems. Can ...
    zx81 zx81 July 2014 Games
  • The I register pointing to $40–$7f causes ULA snow and a crash. Or does it?I have heard it from numerous sources, including a few members of this forum, that 128K/+2 machines crash if the I register points to a range of $40–…

    ... Spectrum, the snow effect kicks in if the I register is in the ... contended, so the snow effect kicks in. (The code will “crash” if you ... know as the ULA snow effect, not an actual crash.

    Haven ...
    Ast_A_Moore Ast_A_Moore February 2018 Development
  • The I register pointing to $40–$7f causes ULA snow and a crash. Or does it?I have heard it from numerous sources, including a few members of this forum, that 128K/+2 machines crash if the I register points to a range of $40–…

    ... state which cases cause snow and which actually crash the ULA. So ... register when a contended RAM bank is paged in causes the snow effect ... . Whether it leads to a potential crash or not ... If you see snow, you might get a crash as well; if ...
    Ast_A_Moore Ast_A_Moore February 2018 Development
  • The I register pointing to $40–$7f causes ULA snow and a crash. Or does it?I have heard it from numerous sources, including a few members of this forum, that 128K/+2 machines crash if the I register points to a range of $40–…

    ... I register pointing to $40–$7f causes ULA snow and a crash. Or ... the crash is different to the snow effect.

    Primary the snow is ... The contents of the refresh register (R) are placed on address ... the contents of the interrupt register (I) is put on ...
    1024MAK 1024MAK February 2018 Development
  • The I register pointing to $40–$7f causes ULA snow and a crash. Or does it?I have heard it from numerous sources, including a few members of this forum, that 128K/+2 machines crash if the I register points to a range of $40–…

    ... No crash.
    2. Odd banks produce the ULA snow effect; even ...
    1. No crash
    2. No ULA snow

    Additional ... I could not cause a crash, but other factors (aside ... snow effect is triggered not just by setting the interrupt register to ...
    Ast_A_Moore Ast_A_Moore March 2018 Development
  • Grey +2 with lines on some games on RGB connectionHi Everyone, Is it OK if I ask a question? I dug my +2 out of the loft after far too many years about a month ago, and I have finally got it ba…

    More info on the ULA rain/snow effect: https://www.worldofspectrum.org/forums/discussion/55839/the-i-register-pointing-to-40-7f-causes-ula-snow-and-a-crash-or-does-it/p1
    Ast_A_Moore Ast_A_Moore May 2019 Hardware
  • Grey +2 with lines on some games on RGB connectionHi Everyone, Is it OK if I ask a question? I dug my +2 out of the loft after far too many years about a month ago, and I have finally got it ba…

    ... rain/snow effect: https://www.worldofspectrum.org/forums/discussion/55839/the-i-register ... -pointing-to-40-7f-causes-ula-snow-and-a-crash-or ...
    AD-RS1600i AD-RS1600i May 2019 Hardware
  • Is spectaculator emulating the +2 correctly?i remembera few games that would crash when running in 128K mode, due to a bug in the hardware of the grey +2, hence it being replaced with the +2a. …

    ... />
    As Woody says, the snow effect appears when I is set ... this even with 'emulate ULA snow' turned on?)

    The ... toast rack 128 didn't crash in any of these cases ...
    Jon Needle Jon Needle August 2003 Emulators
  • RealXThis may be a dumb question but will RealX ever get released?

    ... idea to update your snow effect documentation on your site ... of the I register and the R Register, combined to ... because when the I register falls in the range ... /> A7-A0 = the R register of the Z80
    [/ ... obviously test RealSpec's snow effect as there is none, ...
    Dunny Dunny July 2006 Emulators
  • Help make Retro Gamer greatI'm more than happy with the articles that are now appearing in Retro Gamer, but I want it to become far more of a hub for the retro community than i…

    ... confirmed how the spectrum ULA snow effect work - lots of people with ... that warm, and an interesting effect occurs. Hot air rising from ... a kind of circulating refridgeration effect, known as the "cycle ... see is when the IR register pair is cycled through to ...
    Dunny Dunny March 2007 Games
  • Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…

    ... get the "Snow Effect" with particular values of the I register.

    csmith csmith September 2007 Emulators
  • Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…

    ... get the "Snow Effect" with particular values of the I register.[/QUOTE]

    In fact, I thought the snow effect happens ... />
    I wonder if the snow effect might be another clue on ...
    Patrik Rak Patrik Rak September 2007 Emulators
  • Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…

    For anyone interested in implementing the snow effect, this 48K machine here uses ULA address for A15-A7, and R register for A6-A0. That slightly contradicts the Ramsoft docs (R for A7-A0 stated there), but there you go...
    Woody Woody September 2007 Emulators
  • ULA RAS, CAS cycles, refresh and "snow effect"Hello everyone. I have a question, does anyone observed timings of RAS and CAS generated from ULA? I think there may be answer to where the "snow ef…

    ... will show you how the snow effect works.

    Basically, the ... refresh cycle when the I register is at that magic range ... lower 16K and hence the snow.

    Summay: ULA generates ...
    csmith csmith November 2007 Development
  • ULA RAS, CAS cycles, refresh and "snow effect"Hello everyone. I have a question, does anyone observed timings of RAS and CAS generated from ULA? I think there may be answer to where the "snow ef…

    ... read access, one bug -> snow effect)[/QUOTE]

    If you ... following as proof that the snow effect has nothing to do with ... , but is a contention side-effect and is not required?
    register is set to a particular ...
    csmith csmith November 2007 Development
  • list of ZX games with raining effect(ula snow)If you know any ZX games with raining effect in screen, then add game name to list. I know about this games only: (tested on real ZX128+2 - grey) 4x…

    ... game set register I to value #BF-#FF then raining effect will ... (set in OPTIONS menu "ula snow effect")

    VELESOFT
    velesoft velesoft April 2008 Games
  • Pretty CrashesTo make a 48K spectrum crash spectacularly and beautifully enter the following into basic. Also works on a 128k in 48k mode though not quite as prett…

    ... the I register to the RAM will cause the ULA snow effect, and ...
    Matt_B Matt_B September 2010 Sinclair Basic
  • What model next ?Hi All I already have two 48k rubber kyed 48k Spectrums and a Grey +2 What to get next. ZX Spectrum + ZX Spectrum 128 Toast Rack ZX Spectrum +3

    ... internal structure (equations). Raining/snow effect will fixed if RFSH ... /OUT instructions)
    - disable snow effect(raining) on videoram
    ... write only (software not crash after read port #7FFD). ... +2A (not contended). Snow effect in videoram is fixed ( ...
    velesoft velesoft December 2010 Hardware
  • Emulating the 128KeIt occurs to me that I wasn't frequenting WoSf when I created the 128Ke standard, which means some people haven't heard of it. Here it is: [url]http…

    ... ports doesn't crash the machine
    no snow effect
    no I ...
    chev chev April 2011 Emulators
<1234567…34>

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