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Search Again :: Adv Search 1000 results in 0.020s
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  • Screen corruption with devices on edge connector (grey +2)Hi, I've recently done a full capacitor replacement and replaced all 16x DRAM chips on my grey +2. Prior to this I would get a corrupted screen…

    ... I would get a corrupted screen after a few minutes of ... sitting at the +2 menu screen for several hours and it ... .pl) it starts up with screen corruption. Power it off, remove ...
    Megatron-UK Megatron-UK August 2020 Hardware
  • 48k Spec with composite video mod, screen adjustment possible?I've had a 48k Speccy with a composite video mod for a few years now, and although it works perfectly otherwise, the screen isn't centered correctly …

    ... it works perfectly otherwise, the screen isn't centered correctly - it ...
    Skaepoy Skaepoy August 2020 Hardware
  • Direct drive LCD screen - looking for information on previous projects people may have attempted.Hi All, My first post, so please forgive and guide if I've posted in the incorrect section. I'm a speccy user from way back in the 80's, but m…

    ... start again with designing the screen, so was working on building ... and captures writes to the screen location so as to build ... a coloured border around the screen.

    So kind ... also solve the problem around screen compatibility, and leave me with ...
    cj7hawk cj7hawk December 2020 Hardware
  • Screen RatioAn interesting thing happened with my photos on facebook of my Spectrum setup with my new OSSC (open source scan converter). Some made a fuss (in jes…

    ... big black borders on the screen, and it makes the text ...
    Scottie_uk Scottie_uk January 2021 Games
  • Extra screen in Jet Set Willy?I was online looking at screens from JSW when i came across a reference to an extra screen in JSW called April Showers that could be accessed by typi…

    I was online looking at screens from JSW when i came across a reference to an extra screen in JSW called April Showers that could be accessed by typing some code printed in Your Spectrum. Is this true? Has anyone came across this?
    zx1 zx1 March 2022 Games
  • New loading screen for VIXENIt had been a while since I had worked on a screen, so I got with this game whose cover art was its best part. Vixen [img]https://www.dropbox.c…

    It had been a while since I had worked on a screen, so I got with this game whose cover art was its best part.

    Vixen

    [img]https://www.dropbox.com/s/jbmxvnrnn5mp7vr/vixenx6.png?raw=1[/img]
    MAC_BG MAC_BG August 2022 Games
  • Fake screenshots? No - now it's REAL screenshotsOk then. A few weeks ago I said I will show You the new gfx-mode of Speccy and - here it is: [url="http://republika.pl/hooy_prg/hprg.zip"]http://rep…

    ... - the quickest instruction takes four tstates and that's how long ... ive almost got there, one screen works fine, appears instantaneously, but ... will be fast enough, screen compilers sure as hell arent ... States to copy a screen from a screen location and you only ...
    cyborg cyborg March 2003 Sinclair Miscellaneous
  • AMERICAN SPECTRUM FANS?Hi all. I was wondering, who many Spectrum-fans could live in America... I have many addresses in my zx-base, but not many of them belong to Americ…

    ... with a vertical frequency of 50Hz. NTSC format have a maximum ... lot of "snow" on the screen.
    princm princm May 2003 Sinclair Miscellaneous
  • AMERICAN SPECTRUM FANS?Hi all. I was wondering, who many Spectrum-fans could live in America... I have many addresses in my zx-base, but not many of them belong to Americ…

    ... with a vertical frequency of 50Hz. NTSC format have a maximum ... lot of "snow" on the screen.
    [/quote]

    @@ I ...
    superfo superfo May 2003 Sinclair Miscellaneous
  • Who want to remake Double Dragon?Seeing as the Speccy version was crap (see my review: [url="http://www.gamestyle.net/retro.php?article=31"]http://www.gamestyle.net/retro.php?article…

    ... it in perspective the screen is drawn at 50hz making the sample ...
    cyborg cyborg July 2003 Games
  • Beta versions of Fuse 0.6.2 and libspectrum 0.2.1 availableDear all, The Fuse team is pleased to announce the release of a beta version of the upcoming 0.6.2 release of Fuse and the Fuse utilities, as well a…

    ... it is possible to switch screen modes midway through drawing the ... screen.
    [/quote]

    This ... display modes on a single screen (only one mode per scanline ... is the exact number of tstates after an interrupt that the ...
    Fred Fred January 2004 Emulators
  • whats your second favourite retro computerOk i'm going to assume that for most of us here the speccy is our favourite number 1 retro computer,its the best home computer in the world etc etc :…

    ... were to copy a Spectrum screen (6912) the unrolled loop would ... the pushes.

    At 50Hz and 1MHz, able to copy ...
    Alcoholics Anonymous Alcoholics Anonymous March 2004 Games
  • T.I.M. - A New Interlace - Demo for DOWNLOADHere's something that's been in the works for quite a while ( mostly in my head ) and recently I've aquired assistance to help it come to fruition. …

    ... refresh rate which is not 50Hz

    looking at your ... more than 1/3 of screen for game...
    last summer ...
    Fikee Fikee April 2004 Development
  • T.I.M. - A New Interlace - Demo for DOWNLOADHere's something that's been in the works for quite a while ( mostly in my head ) and recently I've aquired assistance to help it come to fruition. …

    ... the display to full screen. This sort of thing ... trick to get full screen resolution yet requiring half ... compared to the normal 50Hz. I'm not sure ... (Double buffering allows one screen to have blank odd rows ... drawn in each on each screen update).

    ...
    Alcoholics Anonymous Alcoholics Anonymous April 2004 Development
  • Game loop design?Having some thoughts on how to design the game loop and could do with some hints and tips from folks who have done it before! It's all about how to …

    ... at a rate less than 50Hz as drawing graphics is generally ... 're trying to render at 50Hz as this leaves very little ... this:

    prepare first screen
    enter IM2 routine
    exit IM2
    --back to screen drawing function
    finished drawing ...
    cyborg cyborg July 2004 Development
  • Pixel setting / general speccy codingi just started doing some cross-coding with the [url="http://www.bigfatpanda.fsnet.co.uk/z80.html"]Z80 SNA assembler[/url] and an emulator, and this …

    ... of the start of a screen line is the fastest there ... />
    takes 19 tstates ,as opposed to 24 tstates.

    So ...
    dmsmith dmsmith August 2004 Development
  • need help with speed optimization. this procedure draws a sprite with mask from memory onto the screen with x-coordinate in pixels. it doesn't shift sprites in realtime, it just uses …

    ... x 32 masked sprite: 16084 tstates.

    No ... DE,(SCRADR) ; taking precalculated screen address where to draw sprite ... /> LD (SCRADR),HL ;store screen address for sprite drawing
    * Routine to Generate a screen address table
    * SCRTAB must ...
    dmsmith dmsmith August 2004 Development
  • Interrupts details questionSuppose I am writing a game and I want to use interrupts to measure time, draw the screen without flicker, maybe to poll keyboard etc. What kinds of …

    ... x 32 masked sprite: 16084 tstates.

    No attempt has ... off the sides of the screen."

    [url="http://www ...
    cispasoiu cispasoiu August 2004 Development
  • Interrupts details questionSuppose I am writing a game and I want to use interrupts to measure time, draw the screen without flicker, maybe to poll keyboard etc. What kinds of …

    ... few Spectrum games have a 50Hz update rate (is there more ... by 4 char sprites on screen at once? Not many... those ... have > 8 sprites on screen usually make the majority of ...
    Alcoholics Anonymous Alcoholics Anonymous August 2004 Development
  • I would like to write emulatorHi guys, I'm new to this forum but I realise that you must get loads of posts from people asking "how do I write an emulator" so I'll try and be spe…

    ... the speccy updates its screen every 69888 Tstates?
    - 2. Any chance ...
    MadDoc MadDoc September 2004 Development
  • I would like to write emulatorHi guys, I'm new to this forum but I realise that you must get loads of posts from people asking "how do I write an emulator" so I'll try and be spe…

    ... the speccy updates its screen every 69888 Tstates?
    [/quote]
    ... it *finishes* at 69888 TStates on a 48k. That value ... emulator should update the screen after 69888 TStates.

    [ ... br /> [quote]

    TStates are just a measurement of ...
    Dunny Dunny September 2004 Development
  • Smooth Color Masked Sprites using fast page flip on 48kHere is a quick demo of using char based sprites using the Page flip method: a) Background is copied to buffer b) Sprites drawn on buffer c) Buffer …

    ... />
    With regard to the screen flip portion of the code ... 4 as opposed to 6 tstates.

    In fact using ...
    dmsmith dmsmith September 2004 Development
  • Slightly OT : Xbox emulationI'm interested if anyone here uses a modded Xbox for emulation purposes. I like the idea of using a console rather than a PC for playing games, but I…

    ... most emu`s as the screen update is spot on at ... dog pc emu`s (causing screen tearing and other problems). [/quote ... 60Hz because the TV is 50HZ, but are you saying that ...
    Spector Spector September 2004 Emulators
  • Wanted: Code to wait until Border has been drawnWhen my IM2 interrupt fires, I want to wait until the ULA is past the first line of display before drawing. I know I need to wait about 14300T after…

    Define "when the screen is about to refresh". The ... 48K machine) tstates before the top-level pixel of the screen (as ... waits 14112 ( = 14336 - 224 ) + n tstates, then changes the border colour ... line indicate the number of tstates which have elapsed since ...
    Philip Kendall Philip Kendall September 2004 Development
  • Can Anyone explain sprites in Jet Pac/Atic Atac etcJet Pac was 16k, and yet the sprites were impressively fast. I notice they had a slight flicker at times, but were notmally pretty flicker free. W…

    ... would shave a good few tstates off its worst case timing ... draws the sprite on the screen, rather than calling it.
    dmsmith dmsmith October 2004 Development
  • Sprites flickeringI am trying to write a Spectrum game in machine code. I am still a beginner in programming, however I did much progress recently, i believe. Now I am…

    ... your sprite to the screen before the raster has ... 128 + 64) * 224 = 43008 tstates. The 64 is the number ... to the top of the screen (display file). Using ... + 55 + 64) * 224 = 40992 tstates in which to draw your ... +2 etc. take 228 tstates per screen line. Hope this is ...
    dmsmith dmsmith October 2004 Development
  • Sprites flickeringI am trying to write a Spectrum game in machine code. I am still a beginner in programming, however I did much progress recently, i believe. Now I am…

    ... can perform operations not involving screen, like keyboard reading, data calculating ... i must count how much tstates they take
    3. when ...
    Ralf Ralf October 2004 Development
  • Sprites flickeringI am trying to write a Spectrum game in machine code. I am still a beginner in programming, however I did much progress recently, i believe. Now I am…

    ... able to do in 40000 tstates is dependant on a number ... top 2 thirds of the screen to be used. One way ...
    dmsmith dmsmith October 2004 Development
  • NTSC Spectrums?Being in the U.S., I missed the whole ZX Spectrum thing in Europe in the 80's. I've never seen an actual ZX Spectrum. I know that in the states the…

    ... Amiga 1084 RGB analog screen? It goes 50Hz fine w/ my Amiga ...
    blakespot blakespot November 2004 Sinclair Miscellaneous
  • Will Spectrum run @ 60Hz?Sorry to overlap w/ my other recent post, but want to know, if I grab a Spectrum and use it in America with a voltage converter or a different power …

    So are you saying that it will work at 60Hz and everything will run too fast and the screen's vblanking will be off, etc?

    (I have a RGB screen capable of 50Hz and 60Hz display).

    Please let me know.



    bp
    blakespot blakespot November 2004 Sinclair Miscellaneous
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