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<1…16171819202122…34>
  • Ninjaman 8-way scrolling 50Hz multicolour demo :-)Here's a demo I've been working on for a while. The goal was to make the best scrolling routine possible on a humble 48K ZX Spectrum. I was origin…

    ... , which is what allows vertical scrolling. It [i]may[/i] be ... execute. Too late, and the ULA will already have read in ... the old attributes before the ULA read them.

    The ...
    Kayamon Kayamon November 2015 Development
  • ZX Spectrum Sprite chipHi everyone. As I said some time ago, I wanted to make a 'virtual' Sprite chip for the ZX spectrum, on my ZEsarUX emulator. The idea is to make so…

    ... . Even little things like the scrolling would seem extremely unlikely without ... very minimum, completely replacing the ULA. The sprites seem even less ...
    AndyC AndyC November 2015 Emulators
  • ZX Spectrum Sprite chipHi everyone. As I said some time ago, I wanted to make a 'virtual' Sprite chip for the ZX spectrum, on my ZEsarUX emulator. The idea is to make so…

    ... . Even little things like the scrolling would seem extremely unlikely without ... very minimum, completely replacing the ULA. The sprites seem even less ...
    Timmy Timmy November 2015 Emulators
  • ZX Spectrum Sprite chipHi everyone. As I said some time ago, I wanted to make a 'virtual' Sprite chip for the ZX spectrum, on my ZEsarUX emulator. The idea is to make so…

    ... Even little things like the scrolling would seem extremely unlikely without ... very minimum, completely replacing the ULA. The sprites seem even ... br /> [/quote]

    ULA+ was emulation only, now it ... be room in the new ULA for added functions).
    ...
    BiNMaN BiNMaN November 2015 Emulators
  • ZX Spectrum Sprite chipHi everyone. As I said some time ago, I wanted to make a 'virtual' Sprite chip for the ZX spectrum, on my ZEsarUX emulator. The idea is to make so…

    ... hardware.

    Consider your scrolling for example: you need to ... you aren't replacing the ULA you need to allow it ...
    AndyC AndyC November 2015 Emulators
  • ZX Spectrum Sprite chipHi everyone. As I said some time ago, I wanted to make a 'virtual' Sprite chip for the ZX spectrum, on my ZEsarUX emulator. The idea is to make so…

    Okay, the screen scrolling is tricker. But the sprites ... hardware logic in a expanded "ULA". So no problems with memory ... the conventional part of the "ULA" logic.

    [b][i ...
    1024MAK 1024MAK November 2015 Emulators
  • ZX Spectrum Sprite chipHi everyone. As I said some time ago, I wanted to make a 'virtual' Sprite chip for the ZX spectrum, on my ZEsarUX emulator. The idea is to make so…

    ... an add-on chip to ULA overlaying the original screen. Not ... it is possible to add scrolling text mode plane(s) but ...
    maiki maiki November 2015 Emulators
  • Vega ARM SOC?I read that the core of the new Vega was an ARM SOC. I thought it would have been an FPGA. But it seems it's an ARM running an emulator. Anyone kn…

    ... during the first effect (snow screen, then eyes scrolling up, then the ... phrase "GET DOWN" scrolling down). This also happen in ...
    mcleod_ideafix mcleod_ideafix December 2015 Vega
  • Nirvana+ - Which games would you reproduce?Which games would you reproduce using Nirvana+ Early single screen or non-scrolling arcade games that could utilise the Nirvana+ engine for enhanc…

    ... /> Early single screen or non-scrolling arcade games that could utilise ... /> Rod-Land 1990 Jaleco
    Snow Bros. - Nick & Tom 1990 ...
    Rebelstar Rebelstar June 2016 New game ideas
  • Sinclair ZX Spectrum 128My loving mum has brought me back one of these beauties from a carboot sale but I'm haven a slight problem with it I CAN'T FIND THE ON SWITCH!!!!!…

    ... /> Fitted a heatsink to the ULA chip in order to keep ... chip without bugs - [removes snow effect (ULA rain) from certain games and ...
    murtceps murtceps November 2016 Sinclair Miscellaneous
  • How would you approach parallax?So ... there is this trick by Joffa that we all know...of waiting for the ULA to reach certain pattern on the screen using the IN command. And then s…

    ...

    If I start scrolling the screen when screen ray ... an IN detecting sequence of ULA bytes with certain pattern) then ... besides RLD for 2 pixel scrolling?

    This is ... up with for 2 pixel scrolling.

    [code]
    ;; ...
    tstih tstih December 2016 Development
  • Contended memory article on WikipediaYeah, apparently there's one. https://en.m.wikipedia.org/wiki/ZX_Spectrum_Contended_Memory [quote] However, the ULA must wait for a Z80 read or wr…

    ... nothing to do with ULA contention, "snow" or the ULA being unable to ...
    BloodBaz BloodBaz December 2016 Sinclair Miscellaneous
  • ZX 128+ RGB Scart - ghosting,patterns,flickeringHi all, I have a ZX Spectrum 128+ with RGB Scart (from TheSinclairShop bought ages ago) hooked on a 40' Samsung Smart TV. Awful ghosting, silly p…

    ...
    2nd approach:
    ULA's CSYNC (DIN pin 4 ... bad with a lot of snow!! By now I was ... they all suspected the ULA or TEA2000 and suggested ... reason that killed the suspected ULA and "that" reason could ... kill a second ULA...

    I ...
    geosiou geosiou February 2017 Hardware
  • 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 ...
    Renegade Renegade April 2017 Hardware
  • ULA+Does the ULA+ have to be on before writing a palette? In the examples I've seen, they all enable the ULA+ before writing the palette. Maybe I sh…

    ... and try to generate ula+ colours from that set ... [code]
    HTML Colour Name ULA+
    Black  0
    ... br /> FloralWhite  255
    Snow  255
    Yellow  252< ... Personally, I find the ULA+ editor built into Spin ...
    GReW GReW April 2017 Development
  • ZX Spectrum Next Kickstarter Launchedhttps://www.kickstarter.com/projects/1835143999/zx-spectrum-next

    ... russian clones before. OTOH the ULA+ got significant support despite nobody ... you get unrestricted any-window scrolling with blitter too, not the ... usual limited hardware scrolling done separately.

    [quote ...
    Lethargeek Lethargeek May 2017 Sinclair Miscellaneous
  • ZX Spectrum Next Kickstarter Launchedhttps://www.kickstarter.com/projects/1835143999/zx-spectrum-next

    ... clones before. OTOH the ULA+ got significant support despite ... familiar with.

    ULA+ with significant support? Some new ... as promised in real ULA replacements. I think the ... not the usual limited hardware scrolling done separately.
    [/quote ...
    Alcoholics Anonymous Alcoholics Anonymous May 2017 Sinclair Miscellaneous
  • im looking for a horizontal scroll routinehi, im looking for a horizontal scroll routine. i read somewhere that you can do it with at 'to' statement, somewhere in a print routine. althoug…

    ... $".

    All of the scrolling is done in these two ... . The graphics info for each "snow-capped mountain peak" uses 18 ... of 140 secs is for scrolling 128 "mountains" (ie. 4 screens ...
    Battle Bunny Battle Bunny June 2017 Sinclair Basic
  • What is the maximum fps the spectrum can achieve?I have been doing some reading and from what I understand the Spectrum outputs a PAL signal, but that means it will display @50fps or @25fps? If t…

    ... memory being used by the ULA and will take effect immediately ... have a 50fps frame rate? Scrolling games with a complex enough ...
    AndyC AndyC August 2017 Hardware
  • Interrupts, 16k Spectrums and snowI'm writing something for the 16k Spectrum and I want to use interrupts. The avilable documentation doesn't seem clear enough for me to figure out ho…

    ... may be affected by the ULA reading screen data at the ... restrictions/limitations and affects (including snow) that affect the 48k in ...
    1024MAK 1024MAK August 2017 Development
  • Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…

    [quote="Woody;921301"]I've added preliminary ... found, BC = port (Sinclair ULA: #FFFF, Amstrad ULA: #0FFD)
    ; CF=1 ...
    Hikaru Hikaru September 2017 Development
  • Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…

    ... ]Arkanoid[/i], etc.)
    Mark (Woody) is almost done implementing this ... value currently read by the ULA ORed with 1 (i.e ... intervals (that is, when the ULA is drawing the border or ...
    Ast_A_Moore Ast_A_Moore September 2017 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–…

    ... which cases cause snow and which actually crash the ULA. So it ...
    AndyC AndyC 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–…

    ... which cases cause snow and which actually crash the ULA. So it ... is paged in causes the snow effect. Whether it leads to ... now—is, If you see snow, you might get a crash ...
    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–…

    ... ]crash[/b][es the] [b]ULA[/b] immediately.”[/quote]

    snow. He did leave out an ...
    Alcoholics Anonymous Alcoholics Anonymous 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–…

    ... ]crash[/b][es the] [b]ULA[/b] immediately.”[/quote]

    snow. He did leave out an ... .relative-path.com/zx/files/ULA%20Snow%20Crash.tap"][u][b ...
    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–…

    [quote="Woody;934556"]There's [url="https:// ... only there along with the snow. So, the rule of thumb ... seems to be: avoid the snow, and you’ll avoid crashes ...
    Ast_A_Moore Ast_A_Moore February 2018 Development
  • Writing own emulator: Contention questionsHi! (I don't know if this message should be here or in Hardware) I'm trying to write my own emulator just for the sake of it, and I'm having pr…

    The Z80 puts IR on the bus during the refresh cycle, which is why it can come into play as part of the contention (and why it can confuse the ULA and generate "snow")
    AndyC AndyC April 2018 Emulators
  • Manic Scroller!You're the king of Manic Miner around these parts? Finished it a thousand and one times with one arm tied behind your back? Looking for a new challen…

    ... years to the day after Woody's [url="https://groups.google ... and scrolling message.

    A big thank you to Woody for ... slightly modified title screen and scrolling message. It is now released ...
    jetsetdanny jetsetdanny December 2018 Games
  • Found my old Manic Miner scrolling hackI don't remember if I put this old hack here on WoS so [URL="http://homepage.ntlworld.com/e.tinney/manic.szx"]here's a snapshot[/URL]. Be impressed w…

    ... years to the day after Woody's [url="https://groups.google ... and scrolling message.

    A big thank you to Woody for ... more information about the game. Woody's original snapshots are also ...
    jetsetdanny jetsetdanny December 2018 Games
<1…16171819202122…34>

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