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  • BIFROST* ENGINE 1.2 released!Another improved version of the BIFROST* ENGINE is now available! Download it here: [url]http://www.worldofspectrum.org/infoseekid.cgi?id=0027405[/u…

    ... looped code and a moveable buffer pointer, and 28-wide if ... 's still copying from a linear buffer. Using LD/PUSH it might ... . Kind of like Joffa's screen scrolling, but on a line ... all 192 rows of the screen, except the processor time and ...
    joefish joefish July 2012 Brand new software
  • RCS (Reverse Computer Screen)[B]RCS[/B] ("Reverse Computer Screen", or simply SCR written backwards) is a small utility I'm about to release, that reorders bytes from the ZX-Spec…

    ... of screen banners) - and stored it as character blocks, rather than linear ... on 1/3 of the screen. (Run it three times - once ... each third - for a whole screen of course). You could do ... bad to use the screen as its own buffer.

    How ...
    Gedlion Gedlion January 2013 Development
  • What would you do with four joysticks?Anyone got some inspiring ideas for four-player games, or twin-stick two-player games..? I can think of, for four players: [I]Warlords[/I] (Atari) […

    ... in the middle of the screen, with four 4x12 player ... /> The colour map is a linear buffer that is actually 32 characters ... pixel pattern over the entire screen (like 00001111 for 4x2 pixel ... pass. That way if the screen scrolls, they will automatically be ...
    joefish joefish October 2013 New game ideas
  • filled shape creating codeDevelopment is continuing well on a resurrected project of mine from about 20 years ago. Speed and size optimizations are going well along with displ…

    ... .

    Drawing line in linear buffer, inner loop:
    add hl ... />
    XOR-fill from linear buffer to screen:
    pop de
    xor ...
    Alone Coder Alone Coder October 2013 Development
  • 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…

    ... same difficulty to do a linear buffer as it is to do ... check if you go off screen adds directly to the execution ... it against any rectangle on screen :) But admittedly, that results from ... speculated that the non-linear order of the buffer spreads out the ...
    Alcoholics Anonymous Alcoholics Anonymous May 2014 Sinclair Miscellaneous
  • 64x48 monochrome big pixels display ideaHi. I was playing with this idea of having a simple 64x48 bytes buffer, 1 byte per pixel, then a renderer which would take that buffer and render it…

    ... copy pixels from linear buffer to screen would be trivial:< ... ; copy 48 lines from buffer to screen
    REPT 2 ... big pixels, using a linear buffer to store attributes, ... from this linear buffer and modifies attributes on screen every 4 ...
    Einar Saukas Einar Saukas December 2014 Development
  • 64x48 monochrome big pixels display ideaHi. I was playing with this idea of having a simple 64x48 bytes buffer, 1 byte per pixel, then a renderer which would take that buffer and render it…

    ... routine to copy pixels from linear buffer to screen took 50,142 T ... -states. Therefore copying entire buffer to screen will be 49,698 T ... / 29 = 1,713 pixels on screen one-by-one every frame ... to more than 55% of screen. This probably makes sense for ...
    Einar Saukas Einar Saukas December 2014 Development
  • 64x48 monochrome big pixels display ideaHi. I was playing with this idea of having a simple 64x48 bytes buffer, 1 byte per pixel, then a renderer which would take that buffer and render it…

    ... 's the point of this buffer business?[/QUOTE]

    ... to update almost the entire screen before displaying it again. ... simply use NIRVANA and update screen directly. :)

    Unless ... time to also copy from linear buffer would not cost anything ...
    Einar Saukas Einar Saukas December 2014 Development
  • Advices for double buffering ?Hi, I'm currently coding graphics routines for a forthcoming game, I use a double buffer (the dummy screen is at $e000, the code at $8000) to pro…

    ... top to bottom in a linear fashion behind the raster ... the case, copying the buffer behind the raster is still ... the top of the screen area at around 15K ... no reason to reduce the screen size. A fullscreen SP ... likely drawn most of the screen. They aren't gonna ...
    Hikaru Hikaru September 2015 Development
  • Let's copy buffers!Figured I'd do some double buffered graphics, so I can render for several frames before displaying stuff. Yes, I mean on a 48k speccy, so no 128k spe…

    ... push af

    ; calculate screen address at right side

    ; read 12 bytes from linear buffer (right side)
    buffer2:
    ; write 12 bytes to screen (right side)
    ld sp ...
    Einar Saukas Einar Saukas April 2016 Development
  • Let's copy buffers!Figured I'd do some double buffered graphics, so I can render for several frames before displaying stuff. Yes, I mean on a 48k speccy, so no 128k spe…

    ... push af

    ; calculate screen address at right side

    ; read 12 bytes from linear buffer (right side)
    buffer2:
    ; write 12 bytes to screen (right side)
    ld sp ...
    Einar Saukas Einar Saukas April 2016 Development
  • Let's copy buffers!Figured I'd do some double buffered graphics, so I can render for several frames before displaying stuff. Yes, I mean on a 48k speccy, so no 128k spe…

    ... for the routine and the buffer RAM is in uncontended memory ... as performing conversion from linear buffer to wierdo Speccy screen format is to ...
    Mysterion Mysterion April 2016 Development
  • P.O.W.As far as I know, a port of P.O.W. (Prisoners of War) from NHK, doesn't exist. [img]https://cld.pt/dl/download/61d19b5e-453b-489c-b17b-d3ed6fccd594/…

    ... do it. Assuming the active screen area is 20 characters high ... , as long as your buffer copy is linear, this 'crossing the beams ...
    Hikaru Hikaru June 2016 Development
  • P.O.W.As far as I know, a port of P.O.W. (Prisoners of War) from NHK, doesn't exist. [img]https://cld.pt/dl/download/61d19b5e-453b-489c-b17b-d3ed6fccd594/…

    ... it. Assuming the active screen area is 20 characters high ... as long as your buffer copy is linear, this 'crossing the ... area.
    - Copies buffer to screen memory using set of LDIs ... .
    - Buffer is conveniently ROM ...
    RMartins RMartins June 2016 Development
  • P.O.W.As far as I know, a port of P.O.W. (Prisoners of War) from NHK, doesn't exist. [img]https://cld.pt/dl/download/61d19b5e-453b-489c-b17b-d3ed6fccd594/…

    ... the beginning of your active screen area, vertically

    ... the active screen area
    2. Screen update starts (buffer copy). This ... s done in the usual linear fashion the two can ... updated screen frame
    4. Presumably by this time your buffer ...
    Hikaru Hikaru June 2016 Development
  • Fast way to clear the screen ?So I was wondering fastest way to clear the screen. I've tried this and this works but is it better than CLS ? LD HL,16384 LD BC, 6144 Loop…

    ... you'll probably need a buffer screen in memory anyway. Drawing ... you have several lines on screen.

    In such ... clearing Spectrum screen at 16384 as copying the buffer onto it ... of actual screen memory. If you make your buffer linear, then drawing ...
    Ralf Ralf December 2016 Assembler
  • off screen bufferwhen using an offscreen buffer is the memory copied to the screen in a way that makes it easier to draw sprites to the buffer? E.g. Lets say you…

    ... procedure which will copy buffer to screen and take into account ... the way you organised the buffer ... games would be:
    - linear (next horizontal line data is ... - just the same as Spectrum screen memory is organised

    Ralf Ralf June 2017 Development
  • How to improve my program using oversized numbersI'd like my dice program to print out the number four times bigger than normal if possible. Anyone know how to do this? Or I could write a sub rou…

    ... the printer buffer, and since it’s linear (unlike Speccy’s screen memory ... doesn’t have a printer buffer.

    I used this ...
    Ast_A_Moore Ast_A_Moore July 2017 BASIC
  • Raster effects - quick questionHi Guys Just a quick question regards what the ULA is doing as its drawing each scan line. Assuming the beam has finished drawing the border, am I…

    ... the top line of the screen; synchronising itself with memory writes ... . engine doesn't use a linear buffer of colour data. The data ...
    joefish joefish August 2019 Development
  • Raster effects - quick questionHi Guys Just a quick question regards what the ULA is doing as its drawing each scan line. Assuming the beam has finished drawing the border, am I…

    ... the size of the active screen area for performance reasons, which ... attribute values from my own linear buffer of 32x24 bytes into video ... attribute values from my own linear buffer, now modified to 32x48 bytes ... at a time from the buffer into a register, it seems ...
    Dax Trajero Dax Trajero August 2019 Development
  • Screen$ +3 disk to tape helpHi, I have several full screen pictures of my +3 disks (Screen$). How can I transfer these pictures onto tape without losing the last to lines beca…

    ... />
    I have several full screen pictures of my +3 disks ... (Screen$).

    How can I ...
    Stephen Stephen February 2001 Sinclair Miscellaneous
  • Most nice Loader ScreenHi, What is the better loader screen from speccy games?? or simply which is the screen you more remember.. I remember a lot the screen$ from Roboc…

    Hi,

    What is the better loader screen from speccy games?? or simply which is the screen you more remember..

    I remember a lot the screen$ from Robocop and HeadOverHeels.. also GreenBeret.
    Javier Alca?iz Javier Alca?iz March 2002 Games
  • Screen PreloadersDid any of you chaps write your own spectrum games or applications. If yes , did any of you guys manage to get a preloading screen going..... Its …

    Did any of you chaps write your own spectrum games or applications.

    If yes , did any of you guys manage to get a preloading screen going.....

    Its been a mystery to me , how to do this.
    ozonic ozonic April 2002 Games
  • Identify game - flip-screen mazeI was playing this game in the mid-80s, I would say. It was a flip-screen game, a bit like Jet Set Willy in that regard, although it was viewed from …

    ... say. It was a flip-screen game, a bit like Jet ... small gaps.

    Each screen was a bit of a ...
    pelago pelago May 2002 Games
  • Screen$ ScreensaverDoes anyone know where I can get a screensaver called "Screen$" that apparently simulates a Speccy loading?

    Does anyone know where I can get a screensaver called "Screen$" that apparently simulates a Speccy loading?
    Zagreb Zagreb August 2002 Sinclair Miscellaneous
  • windows loading screenhello all, anyone got a windows98 bootup screen that looks like a spectrum tape loading screen? Will be cool isn't it? Imagine...a grayish screen, w…

    ... , anyone got a windows98 bootup screen that looks like a spectrum ... tape loading screen? Will be cool isn't ... ?

    Imagine...a grayish screen, with the sinclair copyright line ...
    newbie88 newbie88 October 2002 Sinclair Miscellaneous
  • Solution for overwritten stack in 48k SNA filesIt has been known for quite some time now that the 48k SNA file format has one serious fault, which is described in the file formats section on the W…

    ... buffer or something, so the next time annomalies appear on the screen ...
    Anonymous Anonymous October 2002 Emulators
  • Which game has best ending screen?Spectrum games lacks ending screens mostly, but there may be some brilliant games with very good ending screens/demos. I'm now searching for them. I…

    Spectrum games lacks ending screens mostly, but there may be some brilliant games with very good ending screens/demos. I'm now searching for them.

    I like ending screen of captain blood and rainbow islands 2. I know there are better ones.
    Arda Arda October 2002 Games
  • Manic Miner - your favourite screenThis is one of the most famous games, and the reason why is becasaue it's one of the best. The screens are so stylishly done and brilliantly structur…

    ... . But what is your favourite screen out of the 20 you ...
    Spector Spector November 2002 Games
  • Spectrum +3 fault - flashing screen on power onHi ive just bought a +3 When I power it on the power led and disk drive led come on. The screen just flashes black and white around the border, almos…

    ... led come on.
    The screen just flashes black and white ... does not show the diag screen,
    and I dont see ...
    mlasham mlasham December 2002 Sinclair Miscellaneous
<1…567891011…34>

Latest Posts

  • Your Favorite Magazine Cover Tapes.
    Your Spec-chum on 2:19PM
  • Where to Buy the New or Fairly Recent , Excellent ZX Spectrum Games Software?
    Your Spec-chum on 1:34PM
  • i am currently listening to........
    mel the bell on 11:34AM
  • Mis-labeled cassette titles or a name change?
    harriusherbartio on 11:06AM
  • Ways to preserve Speccy Tapes in the loft
    harriusherbartio on 10:58AM
  • Fixed Speccy Software. And which games remained unfixed?
    harriusherbartio on 10:47AM
  • Minor British Sports that did become games on the ZX Spectrum
    harriusherbartio on 10:30AM
  • How to return to basic properly from ASM
    Paradigm Shifter on 1:54AM
  • Frankie's ZX Spectrum Digouts
    Zup on April 8
  • Elusive Strategy Games done by the Smaller or less Prolific Software Houses.
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  • Return of Speccy screen buffer formatI recently discovered that the Spectrum screen buffer format that allows only two colours in an 8x8 pixel block has made its return in a slightly dif…
  • Writing to the screen from a bufferI?m designing a game and am spending a bit of time trying different ideas before I commit my self. I?m currently thinking of writing data to a buffer…
  • Question on copying screen bufferHi,<br /> <br /> Al my prevoius games were copying graphics directly to screen memory starting at 16384. Now I'm experimenting with screen buffer whe…
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