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<1…18192021222324…34>
  • Double height text...<p>Is here any good routines for printing a font double height?</p><p>I've concocted this ridiculous routine but I'm sure it can be done much better.…

    ... hl,15616;48384;15616
    loop
     inc hl
     inc ... hl
     inc hl djnz loop ld a,(hl)
    x1 ...
    daveysludge daveysludge June 2015 Development
  • Game completion challenge #1Here we go then. Everyone ready?<div><br></div><div>As it's the first one, I set the random game filter to a rating of 8/10 or higher so we're hopefu…

    ... really 'complete', though games that loop round are OK. I'm ...
    Morkin Morkin June 2015 Games
  • Fuse tests - INC BC causes contention delayHi all, In the FUSE test suite it has the following for the output of opCode 0x3 (INC BC): 0 MC 0000 4 MR 0000 03 4 MC 0001 …

    Hi all,

    In the FUSE test suite it has the following for the output of opCode 0x3 (INC BC):

    0 MC 0000
    4 MR 0000 03
    4 MC 0001
    5 MC 0001

    Where this is defined by:

    ...
    garethadams garethadams July 2015 Emulators
  • ZERO Emulator - BugsI have been using Zero emulator to experiment a few routines in assembly, since it has a somewhat usable debugger. However I believe I found a few b…

    I have been using Zero emulator to experiment a few routines in assembly, since it has a somewhat usable debugger.
    However I believe I found a few bugs, some in "zero" application, and some on emulation itself.

    The following example ...
    RMartins RMartins July 2015 Emulators
  • 1-Bit Sound AccuracyI'm hoping someone can give this snapshot a try on a real machine (just press enter to start the music): https://drive.google.com/file/d/0B6XhJJ33xp…

    ... slowed down the tone generation loop which theoretically drops the frequency ...
    Alcoholics Anonymous Alcoholics Anonymous September 2015 Development
  • New version emulator ZEsarUX 3.1Hi I have uploaded a new version of my emulator ZEsarUX on http://sourceforge.net/projects/zesarux I have improved accessibility support, no…

    ... />
    Fixed Inves ULA Colour Delay. It only affects bright
    chernandezba chernandezba October 2015 Emulators
  • Chompston Mazes in SpecBASAfter the discussion in ASH-II's Pacman thread, I checked out the link there about generating 2D Pacman style mazes. This one was quite good fun, …

    ... (x,y)=1 THEN
    LOOP
    ELSE
    LET m ... set to 1) then we LOOP around to get a new ... directions in it. Then we loop around for each builder. We ...
    Dunny Dunny October 2015 Sinclair Basic
  • Spectrum+ PiInspired by Hammer09'sd weekend project http://www.worldofspectrum.org/forums/discussion/comment/832342/ and Tynemouth Software's Spectrum+ Pi https:…

    ... to standard USB plug, keyboard loop cable into Pi (alternatively Pi ...
    JasonUK JasonUK October 2015 Sinclair Miscellaneous
  • How to Write ZX Spectrum Games - Jonathan CauldwellHello, I'm trying to improve my very basic level of assembler by reading the Jonathan Cauldwell guide. I'm fine with the basics LD, CP, and JP,…

    ... ,2
    call 5633
    loop
    ld de,string
    call 8252
    jp loop

    string defb 'ZX ...
    jonesypeter jonesypeter October 2015 Development
  • Issue 3B woesHello there, I currently have a Issue 3B for repairs around, it used to have broken upper and lower RAM, which I replaced with 41256-120 DRAMs (hac…

    ... it remains in a reset loop. During the whole thing no ...
    Shockwav3 Shockwav3 November 2015 Hardware
  • Drawing some spritesI figured I want to draw some sprites. My target was to do a 16x16 masked sprite. There's no clearing here, just drawing the sprites. My first ite…

    ... /> [/code]

    Turned inner loop to assembly, and got to ... in a frame. Unrolling the loop got to 18 sprites. Code ...
    Sol_HSA Sol_HSA November 2015 Development
  • Help With AY Music Program in BASICHi, last year I started writing a BASIC program for making and recording AY Music. I thought it would be easier than learning how to use Soundtracker…

    ... static text.
    2050 REM *** LOOP KEYSCANS BACK TO HERE *** Print ...
    RetroPhase2014 RetroPhase2014 December 2015 Sinclair Basic
  • Anyone else got a Roku player?I got a Roku media streaming player in the Post-Xmas sales, but so far I'm not that impressed. It has Netflix and YouTube on it, but my DVD player…

    ... or 3 ads on a loop)

    Does anyone know ...
    Grunaki Grunaki January 2016 Chit chat
  • Problem with BC corrupting after DJNZJust for fun, I'm messing around trying to get the level maps from Lemmings to display on the screen with machine code. It's been ages since I did an…

    ... ; DECREMENT THE LINE COUNTER AND LOOP
    ; I'm only trying ...
    mulder mulder January 2016 Development
  • New WYZTracker versionHello! New version of WYZTracker (and its player) available! New player features: [list][*]Song can loop to an specific pattern. [*]Drums can …

    ... :

    [list][*]Song can loop to an specific pattern.
    AugustoRuiz AugustoRuiz March 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…

    ... bookkeeping around the repeating inner loop).

    The most obvious ...
    Sol_HSA Sol_HSA April 2016 Development
  • Yerz ZX Spectrum gig in "Polikultura" festival, May 2016, KrakowHi, there was my tiny chiptune concert in Krakow, 20 May 2016, within the Festival of Culture and Media "Polikultura" organized by Jagiellonian Un…

    ... special effects
    - Korg Monotron Delay
    - Casio SA-47
    Yerzmyey Yerzmyey May 2016 Sinclair Miscellaneous
  • Death Wish 3... does it have an end?Does anyone know if Death Wish 3 has an end? Or is it just an endless loop of killing bosses and thugs untill you get killed? Can anyone confirm if …

    Does anyone know if Death Wish 3 has an end? Or is it just an endless loop of killing bosses and thugs untill you get killed?
    Can anyone confirm if it has an end?
    Danae's Fan #1 Danae's Fan #1 July 2016 Games
  • Why doesnt this work???Simple piece of code wont do as it should, just want to fill the top 22 lines of screen with an attribute value (150) but it wont have any of it. Som…

    ...
    ld bc,704
    loop
    ld a,150
    inc de
    djnz loop
    ret
    [/code]
    daveysludge daveysludge October 2016 Development
  • Flicker-free animationTrying to create flicker-free screen update, but... Where I'm wrong? [url="https://dl.dropboxusercontent.com/s/pfywhfejfmwt2zq/test_128.sna"]Snaps…

    ... />
    start:
    ei
    loop:
    halt
    call swap_video ... /> call draw_keep

    jr loop

    ; --------------
    keeper:
    Bedazzle Bedazzle October 2016 Development
  • Graphics program in AssemblyHi so I think I'm getting the hang of this so I've done this program. It writes directly to the screen. I'm using ZX Spin. [code] LD HL,16384 LD B,…

    ...
    LD B, 255
    loop
    LD (HL),170
    INC HL
    DJNZ loop
    RET[/code]
    This ...
    ivanb303 ivanb303 October 2016 Assembler
  • ZX Spin and a question or two......Not really used Spin before since Spectaculator covers everything I need - except now I have need of an easy to use assembler. Downloaded several, n…

    ... like:

    [code]
    LOOP LD A,(HL)
    CP ...
    INC HL
    JR LOOP
    [/code]


    DEATH DEATH November 2016 Emulators
  • 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…

    ... /> LD BC, 6144

    Loop:
    LD A,0
    OR C
    JR NZ, Loop
    RET

    To ...
    ivanb303 ivanb303 December 2016 Assembler
  • Random Numbers, USR Return Values & Timing BASICI've been trying out Jon Ritman's random number routine, published in Your Sinclair Aug'87. Apart from a timing comparison I also did a frequency ana…

    ... goes, after deducting the test loop processing overhead, RND took 8 ... "9994 REM"), to get the loop overhead. The timing for that ...
    Battle Bunny Battle Bunny January 2017 Sinclair Basic
  • A sped up pixel-shift routine for 1-byte–wide spritesHere’s an optimized (for speed) real-time sprite shifting routine for sprites that are one byte wide. It uses no memory variables for storage of inte…

    ... ; HL
    pop bc ;restore loop counter
    djnz msl_draw_loop ;rinse ...
    Ast_A_Moore Ast_A_Moore February 2017 Development
  • Copying a single character from one place to another?[code] ORG 33000 LD A,8 LD HL,16384 LD BC,256 LD DE, 18432 LOOP: PUSH AF LD A,(HL) LD (DE),A ADD HL, BC POP AF DEC A JR NZ,LOOP REST […

    ...
    LD DE, 18432
    LOOP:
    PUSH AF
    LD ... /> DEC A
    JR NZ,LOOP
    REST
    [/code]
    ivanb303 ivanb303 March 2017 Assembler
  • ZXSCLZF - Yet another Screen CompressorQuick disclaimer before I continue, this compressor does not shrink screens as small as some of the others posted here, in particular the very good z…

    ... br /> //
    // =========
    // main loop
    // =========
    while(zxlayout(buffer ...
    djnz _ulzfa010 ; 13/8t - loop
    _ulzfa020:
    ;;
    ... /> ;;
    ;; clean up before loop
    pop hl ; 10t - bring ...
    TomD TomD April 2017 Development
  • z88dk sp1lib with fzxThe numbers dont seem to display properly? fzx by itself works [quote] // for targets supporting fzx // zcc +zx -vn -startup=31 -O3 -clib…

    ... , colourSpr);
    }

    // Main Loop
    joys = 0;
    setupkeyboard ...
    slenkar slenkar June 2017 Development
  • how does this multiplication routine work?taken from chuntey wordpress: imul ld e,d ; HL = H * D ld a,h ; make accumulator first multiplier. ld …

    ... why does it repeat the loop 8 times no matter what ...
    slenkar slenkar July 2017 Assembler
<1…18192021222324…34>

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