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  • 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…

    ... ] I wonder if the snow effect might be another clue ... on.

    The ULA is responsible for generating the ... address range that the ULA is supposed to generate RAS ... clock is held by the ULA, and this disrupts the ... being generated by the ULA for its own video ...
    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…

    ... think it is because the ULA starts applying the contention only ... those T states (thus the snow effect) as well as why ...
    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…

    ... think it is because the ULA starts applying the contention only ... those T states (thus the snow effect) as well as why ... less contention than the 48K ULA (specifically, it applies contention only ... is active, whereas the 48K ULA applies it under all circumstances ...
    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…

    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
  • Project: M.u.l.e.Wokani came up with a great idea about trying an open-development approach for spectrum games, and I thought why not try with a game I have under dev…

    ... d_ScrollStart() is called to start scrolling the message and d_ScrollStop() is ... called to stop scrolling. The message to be ... memset(disp, 0, 32); // clear horizontal scanline
    disp += 0x0100; // next ...
    Alcoholics Anonymous Alcoholics Anonymous October 2007 Development
  • Broken SpectrumsChaps ( & Mrs Death ), I was looking at getting some dynamic ram chips for the next phase of the Harlequin stuff, and I started thinking...... I've…

    ... into exactly what causes the snow effect.
    Jrok ... doing some real spectrum ULA traces so I can ... I want to reproduce the ULA RAS/CAS generation and ... work out about the ULA, along with the speculative ... oddities in a "Sinclair ULA Internals" paper. I thought ...
    csmith csmith October 2007 Hardware
  • MULTITECH pictures[url]http://velesoft.speccy.cz/data-gear.htm[/url]

    ... port #FE work too, but ULA draw border only each 4T ... (press key "1") and scrolling is unstable, ULA is too slow for ...
    velesoft velesoft October 2007 Hardware
  • What was a Z80 computer capable of ?I have always wondered, and maybe the techy people on here could answer, with what you know about the Z80 processor, was the spectrum hampered by the…

    ... do more.

    The ULA reads the display file to ... take care of the sprites / scrolling / text printing all by itself ...
    Alcoholics Anonymous Alcoholics Anonymous November 2007 Hardware
  • FPGA Spectrum is aliveMy FPGA Spectrum that I started to work on year ago is in 90% ready. I have fixed DDR controller so I can read from it and write to it. I've run som…

    ... /> 3. All glue logic and ULA imitation implemented in FPGA (Spartan ... resolution (and as a result horizontal sync frequency) is two times ...
    brian-82 brian-82 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…

    ... how the snow effect works.

    Basically, the ULA is ... 16K and hence the snow.

    Summay: ULA generates RAS for ... refresh pulses....... So will my ULA replacement ;-) )

    Watch ... mini-book "The ZX Spectrum ULA" which will be out ...
    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…

    ... makes me sure that they (ULA engineers) were aware of the ... they used that mechanism as ULA reads from all 128 rows ... read access, one bug -> snow effect)
    brian-82 brian-82 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…

    ... refresh pulses....... So will my ULA replacement ;-) )[/QUOTE]

    Note ... TC2048 at least displays the snow effect - I haven't had ...
    Fred Fred 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…

    ... TC2048 at least displays the snow effect - I haven't had ... is subtly different the to ULA and Z80 RAS/CAS interaction ... with different timings to the ULA.

    When I get ...
    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…

    ... me sure that they (ULA engineers) were aware of ... used that mechanism as ULA reads from all 128 ... read access, one bug -> snow effect)[/QUOTE]

    ... Z80, so neither the ULA or Z80 will be refreshing ... 0x4000-0x7fff, but the ULA _does not_ contend T2, ...
    csmith csmith November 2007 Development
  • another c64 vs. Speccy site...[url]http://c64vsspectrum.com/[/url] 25 years and we are still brawling.. ;)

    ... do as far as vertical scrolling games went...

    [QUOTE ... talking about [B]minimal[/B] ULA improvement only, not something demanding ... issues raised regarding rejigging the ULA lost me a bit... i ...
    TMR TMR January 2008 Games
  • What are the best shoot-em-ups for the Spectrum?I mean, besides Zynaps. That's pretty much a given.

    Dominator was pretty cool when I was younger, but playing it recently I find the constant wibble wobble type noise in the background really annoying and the vertical scrolling levels are shite compared to the horizontal ones.
    dm_boozefreek dm_boozefreek February 2008 Games
  • Which is the best spectrum to have ?Just wanted to know which is the best Spectrum to have as i know some have more bugs than others. All i wanted it for was to play games on both 48k …

    ... - Sound output and the ULA-Corrector (no snow in Russian demos). Another ...
    Speccyman Speccyman March 2008 Hardware
  • Punch up! Bruce Everiss mauled by the internet over why Imagine collapsed.I couldn't see this posted here so I thought I would post it. It kept me amused for at least half an hour. Bruce Everiss on his blog claims piracy br…

    ... screens thanks to a modified ULA.

    I'm sure ... could implement hi-res colour, scrolling and sprites too, but seeing ...
    Matt_B Matt_B April 2008 Sinclair Miscellaneous
  • Games with Parallax ScrollingI loved that effect. It gave a false depth to the game.. To me a game with parallax scrolling was a better game. How wrong I was.. anyway, a list of…

    ... , and then have vertical or horizontal attribute stripes which span the ... make things interesting - of your scrolling area; needless to say, these ...
    XTM of TMG XTM of TMG May 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…

    ... developers to "see" what the ULA was doing. When port 255 ... data being generated by the ULA as it displays the screen ... affects any game, but the 'snow' effect (setting I register between ...
    Jimmy Jimmy June 2008 Games
  • what were the things the Speccy architecture was good for?I don't know a hell of a lot about all the different computers hardware and I wanted to know if the way the Spectrum was built lent itself to certain…

    ... ]I take it all scrolling effects (vertical and horizontal?) are better on ... this as the officially supported scrolling is only to the character ... machines support dual playfield parallax scrolling, although it's possible to ...
    Matt_B Matt_B November 2008 Sinclair Miscellaneous
  • what were the things the Speccy architecture was good for?I don't know a hell of a lot about all the different computers hardware and I wanted to know if the way the Spectrum was built lent itself to certain…

    ... /> I take it all scrolling effects (vertical and horizontal?) are better on ... limitations, speccy can offer good scrolling (Ghost'n'Goblins, Cobra, Zynaps ...
    Fikee Fikee November 2008 Sinclair Miscellaneous
  • CSSCGC 2008 has now officially begunFor coming last in the 2007 crap game compo, I have the honour and privilege of hosting CSSCGC 2008! I have now put up the CSSCGC 2008 website at …

    ... and now handles

    scrolling of screen with adding and ... /> Still to be done:
    horizontal movement (working on it now ...
    Dr BEEP Dr BEEP December 2008 Games
  • Difference in emulator screen sizes and coloursSeeing as Greencard's gone out drinking... I've done a comparison between Spectaculator and ZXSpin. ZXSpin's full screen with border is taller than S…

    ... /../faq/reference/pinouts.htm#ULA"]ULA[/URL]; both the interrupt ... /../faq/reference/pinouts.htm#ULA"]ULA[/URL] has started displaying ... /../faq/reference/pinouts.htm#ULA"]ULA[/URL] has been observed ... pixels, then border, then horizontal retrace, and then border ...
    rich_chandler rich_chandler December 2008 Emulators
  • 4116 DRAM for 48KSomeone told me I got faulty RAM in my broken 48K. They should be 150ns, right? What would be a good place to buy them from?

    ... perfectly stable, but showed some 'snow' on screen. Somehow the Z80 ... , but screen data for the ULA got chewed up sometimes. Tried ... when the ULA reads / writes to the lower RAM. Snow gone, normal ...
    RetroTechie RetroTechie December 2008 Hardware
  • 4116 DRAM for 48KSomeone told me I got faulty RAM in my broken 48K. They should be 150ns, right? What would be a good place to buy them from?

    ... perfectly stable, but showed some 'snow' on screen. Somehow the Z80 ... , but screen data for the ULA got chewed up sometimes.[/QUOTE ...
    mcleod_ideafix mcleod_ideafix January 2009 Hardware
  • 4116 DRAM for 48KSomeone told me I got faulty RAM in my broken 48K. They should be 150ns, right? What would be a good place to buy them from?

    ... ) fixes it!

    The snow is data "leaking" from the ... ROM onto the data the ULA is reading for the screen ...
    Phu Phu January 2009 Hardware
  • 4116 DRAM for 48KSomeone told me I got faulty RAM in my broken 48K. They should be 150ns, right? What would be a good place to buy them from?

    ... that the "snow" dissapeared when I cooled a bit the ULA. It ... came that the ULA I was using ... ). Replacing the ULA with a -6 model solved the snow problem.
    mcleod_ideafix mcleod_ideafix January 2009 Hardware
  • 4116 DRAM for 48KSomeone told me I got faulty RAM in my broken 48K. They should be 150ns, right? What would be a good place to buy them from?

    ... that the "snow" dissapeared when I cooled a bit the ULA. [/QUOTE ... "defect" ULA to GND. Does the snow disappear even if ULA is hot ...
    ingo ingo January 2009 Hardware
  • 4116 DRAM for 48KSomeone told me I got faulty RAM in my broken 48K. They should be 150ns, right? What would be a good place to buy them from?

    ... the "snow" dissapeared when I cooled a bit the ULA. It ... the ULA with a -6 model solved the snow problem.
    snow effect when the ULA had warmed up ... away if I let the ULA cool down.

    ULA.

    The ULA is designed ...
    Phu Phu January 2009 Hardware
<1…17181920212223…34>

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