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Search Again :: Adv Search 1000 results in 0.003s
<1234567…34>
  • 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/…

    [quote="RMartins;864136"]Straight LDI, solution with 16T per 8 ... />
    From my experiments, using LDI solution, without flicker, synchronizing just ... /> NOTE: rollover right side of buffer is off by one pixel ...
    Maziacs Maziacs 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/…

    [quote="RMartins;864235"]Thanks for your ... start.
    - loop unrolled LDI block once
    - added ... extra POP HL, for each LDI Block.
    [/quote]
    buffer will not rotate, and ... to the right of current buffer offset.
    [/quote]
    catmeows catmeows 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/…

    ... /> Sure :)

    [quote="RMartins;864324"][quote="Hikaru;864259"]As ... />

    [quote="RMartins;864324"]I'm trying to ... br />

    [quote="RMartins;864324"]For ATTR, one can ... faster than a straight LDI copy from buffer, due to the ...
    Hikaru Hikaru June 2016 Development
  • MakeTZX DMA Buffer Overrun ?Okay folks, Does anyone know why I get DMA Buffer Overruns when using MakeTZX. Could it be anything to do with my SB Enironment string or anything …

    ... know why I get DMA Buffer Overruns when using MakeTZX. Could ... it possible to change the buffer at all ?

    Just ...
    Andrew Barker Andrew Barker January 2003 Sinclair Miscellaneous
  • 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 …

    ... /> b) Sprites drawn on buffer
    c) Buffer copied to screen
    Instead of LDIR or multiple LDI's I have used the ... copyies the background into the buffer, draws the sprites and when ...

    ; Fill Back buffer with a bright stripy pattern ...
    robpearmain robpearmain September 2004 Development
  • Buffer AdventureQuite a few months ago, probably this year but well before the 60-day history kept on eBay, I was outbid on a copy of Buffer Adventure by someone who…

    ... outbid on a copy of Buffer Adventure by someone whose user ...
    Battle Bunny Battle Bunny September 2005 MIA/STP/SDP
  • 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…

    ... discovered that the Spectrum screen buffer format that allows only two ...
    vilcans vilcans November 2005 Sinclair Miscellaneous
  • The ZX printer buffer in +3 modeI have a few programs on .DSK images that were transferred from Timex disks, but some of them have code starting at 23296. Most of the time the code …

    ... crash and use the printer buffer area while in +3DOS? I ...
    zxbruno zxbruno December 2008 Sinclair Miscellaneous
  • 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…

    ... of writing data to a buffer and then writing this ?back ... buffer? to the screen. Can the ... screen be drawn from the buffer without flicker ? If not, what ...
    Mr Millside Mr Millside June 2009 Development
  • Question on copying screen bufferHi, Al my prevoius games were copying graphics directly to screen memory starting at 16384. Now I'm experimenting with screen buffer where I could d…

    ... I'm experimenting with screen buffer where I could draw my ... just copying static image from buffer to screen after HALT.
    Ralf Ralf December 2009 Development
  • Contention: LDI vs LD (ss), rAccording c.s.s. FAQ: instruction LD (ss),r breakdowns as pc:4,[b]ss:3[/b] and LDI as pc:4,pc+1:4,hl:3,[b]de:3,de:1 x 2[/b] can anyone explain why …

    ... ]ss:3[/b]
    and LDI as pc:4,pc+1 ... explain why WRITE operation in LDI introduces two delays? or that ...
    Fikee Fikee February 2011 Development
  • Push/Pop data copyingWe all know that stack pointer cheese and push/pop is faster to move data than LDIR - which in turn is slower than unrolled LDI's anyway. I rewrote …

    ... turn is slower than unrolled LDI's anyway.

    I ... if throwing over a screen buffer version instead, which is a ... . Could also break the screen buffer into 2x1 blocks and keep ...
    Gedlion Gedlion March 2011 Development
  • Jet Set Willy Turbo edition!Improve the speed of the game with just a few pokes! Do the standard CLEAR 32767 : LOAD "" CODE to get at the BASIC loader (see Your Spectrum issue …

    ... screen with a series of LDI instructions. The game now moves ... the back-buffer wasn't kept in contended memory) The LDI instructions ...
    Jimmy Jimmy May 2011 Sinclair Miscellaneous
  • Byte-order backbufferThis is a tool for Z80 coders who wish the Spectrum screen had a serial layout. It runs as an interrupt mode 2 service routine and uses POP and PUSH …

    ... the serial (or byte order) buffer at 57484 to the Spectrum ... developed as BorderTrix, and b) LDI is faster than POP/PUSH ...
    chev chev April 2012 Development
  • Disabling the +3 disk buffer; yes, but how?I would like to disable the +3 disk buffer in order to retrieve those 4K from the machine's RAMdisk. By reading the computer manual and some posts on…

    ... to disable the +3 disk buffer in order to retrieve those ...
    Alessandro Grussu Alessandro Grussu February 2013 Sinclair Basic
  • Using the stack to blit bufferI was using a ldir to blit my back buffer to the screen RAM, and it was working pretty well if not rather slow. After reading about using the stack …

    ... ldir to blit my back buffer to the screen RAM, and ... like:

    ld sp, buffer
    pop af
    pop ...
    Atari_Jetman Atari_Jetman February 2014 Development
  • From RAM to dim v$() "video buffer" SPEED UP!Hi! This question is related to "quick RAM copy using LET in Basic" ([url]http://www.worldofspectrum.org/forums/showthread.php?t=44296[/url]). Wel…

    ... *20) DIM variable for "video buffer".
    - A zone of RAM ... /make my v$ string "video buffer" for paint whole level screen ...
    Hark0 Hark0 March 2014 Sinclair Basic
  • LDI questionWhen using LDI (or LDD) is it possible to access the value that is transfered from (HL) to (DE), or does the Z80 use an internal data cache to store …

    When using LDI (or LDD) is it possible to access the value that is transfered from (HL) to (DE), or does the Z80 use an internal data cache to store it?
    MatGubbins MatGubbins March 2014 Development
  • Scrolling Bi-Colour Engine for 4-Player GamesJust putting this code up for people to have a look at. Far from finished. Should simply compile and run a bit of a demo. Only good for 128K and +…

    ... /> [CODE]
    ; Bi-Colour Scrolling-Buffer Game Engine for Four Player ... X to address

    ldi
    ld a,(hl)
    inc l
    ldi
    ldi ;draw two pixel rows
    joefish joefish March 2014 Development
  • Double-Buffer ScreenFor my Alien Breed Speccy re-write I decided to use a Double Buffer (DB) or 'Back Screen' to draw all the game action onto, before shuffling the whol…

    ... decided to use a Double Buffer (DB) or 'Back Screen' to ...
    LuMan LuMan April 2014 Development
  • Double Buffer UtilityHi Folks, I've been experimenting with double buffering on a 48k Speccy for a small project I'm working on. After reading lots of good advice here…

    ... self.createBuffer() #1 - Create the buffer
    self.specifyCodeAddress() #2 - Specify ...

    #1 - Create the buffer
    def createBuffer(self):
    KrazyKattapilla KrazyKattapilla August 2014 Development
  • Jetset Willy ATTR Buffer 2Does anyone understand how Jetset Willy uses the system vars area as screen ATTR buffer 2? H5C00 D23552. Thanks

    Does anyone understand how Jetset Willy uses the system vars area as screen ATTR buffer 2?

    H5C00 D23552.

    Thanks
    stevebroad stevebroad September 2014 Sinclair Miscellaneous
  • Buffer to screen - how much?[FONT=Calibri][SIZE=3]I am starting to build a new game and am researching different ways to accomplish what I need to do. My question is, is it poss…

    ... possible to copy a back buffer of size 4096 bytes to ...
    Mr Millside Mr Millside September 2014 Development
  • Screen buffer Tip from Raff CeccoRaff very kindly gave me this tip: "Incidentally, I remembered a trick I used on the Z80 for extra speed: When clearing the screen buffer, it was a…

    ... />
    When clearing the screen buffer, it was actually much quicker ...
    alienbanana alienbanana October 2014 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…

    ... /> In all routines, the source buffer is linear (not in screen ... /> ldi
    ldi
    ldi
    ldi
    ldi
    ldi
    ldi
    ldi
    ldi
    ldi
    ldi ...
    Sol_HSA Sol_HSA April 2016 Development
  • Cool program - buffer delayHere's something fun I wrote tonight thought I'd share. It's essentially a simple buffer delay. A building block for many things. https://www.drop…

    Here's something fun I wrote tonight thought I'd share. It's essentially a simple buffer delay. A building block for many things.

    https://www.dropbox.com/s/rk4q1xu2k2mkk62/BufferTest.z80
    ivanb303 ivanb303 November 2016 Sinclair Basic
  • Mojon Twins MK2 and lighting effectsDoes anyone have any experience in getting the overlay.h working in the MK2 engine. There were several games written in the churro that used the ove…

    ... lit overlay on splib2's buffer

    ... ldi
    ldi
    ldi
    ldi
    ldi
    ldi
    ldi
    ldi
    ldi
    ldi
    ldi ... />
    ; DE -> buffer, HL -> ovl_halo

    andydansby andydansby June 2017 Development
  • 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…

    ... to draw sprites to the buffer?

    E. ... screen where you copy your buffer to,
    it is ...

    if the buffer was copied to the screen ... to draw sprites to the buffer, and then have them ... br /> draw background on buffer (or just clear it)
    slenkar slenkar June 2017 Development
  • [Asm] Is this nested loop faster than LDIR or a bunch of unrolled LDI's?Hi all. I'm learning Z80 asm on Speccy 48K, and to start with I decided to write my own "CLS" routine (without relying on ROM calls or LDIR) as a lea…

    ... a partially unrolled set of LDI's (let's say 5 ...
    ST1 ST1 November 2018 Development
  • Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…

    ... -1 (edit) clears the input buffer.

    I also typed ...
    ld hl, scr_out_row
    ldi
    ldi
    ret

    buffer pos to be set
    ; work out buffer insert address
    ld hl ...
    Paradigm Shifter Paradigm Shifter August 2022 Development
<1234567…34>

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Related Threads

  • MakeTZX DMA Buffer Overrun ?Okay folks,<br /> <br /> Does anyone know why I get DMA Buffer Overruns when using MakeTZX. Could it be anything to do with my SB Enironment string …
  • double buffer or not ? (dizzy games)What method did they used, to animate <br /> the objects in game ?<br /> I am still puzzled about this thing<br /> <br /> Catalin
  • Buffer AdventureQuite a few months ago, probably this year but well before the 60-day history kept on eBay, I was outbid on a copy of Buffer Adventure by someone who…
  • 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…
  • The ZX printer buffer in +3 modeI have a few programs on .DSK images that were transferred from Timex disks, but some of them have code starting at 23296. Most of the time the code …
  • 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…
  • Contention: LDI vs LD (ss), rAccording c.s.s. FAQ:<br /> <br /> instruction LD (ss),r breakdowns as pc:4,[b]ss:3[/b]<br /> and LDI as pc:4,pc+1:4,hl:3,[b]de:3,de:1 x 2[/b]<br /> …
  • Disabling the +3 disk buffer; yes, but how?I would like to disable the +3 disk buffer in order to retrieve those 4K from the machine's RAMdisk. By reading the computer manual and some posts on…
  • DivMMC clock bufferI have completed the first DivMMC EnJOY today:<br /> [url]http://www.worldofspectrum.org/forums/showthread.php?t=44238[/url]<br /> <br /> But there i…

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