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<1…891011121314…34>
  • random number generator without using rnd in basicwhat is the simplest way to generate random numbers in basic (0-255), without using the rnd statement? i also want it to always generate the same…

    ... generate random numbers in basic (0-255), without using the rnd statement ... ]

    Do you want 0-255 each number once before next ...
    Dr BEEP Dr BEEP November 2019 Development
  • How to store and recall a "window"?I would like to memorize and then restore a rectangular portion of a screen, pixels and attributes. To make things easier, this "window" would be sit…

    ... /> z = a
    FOR m = 0 TO 7
    FOR n ...
    Alessandro Grussu Alessandro Grussu February 2020 Development
  • this code wont give me a random starfieldim using a peice of code that ive copied from a book, ignore most of it as it is redundant. for some reason i get a strange random starfield instead …

    ... /> call random
    and 255[/code]

    Clearly, ... a random (0.255) value in A to (0..175). It ... 15, 31, 63, 127, 255). Secondly, even if it did ...
    Secondly, [code]AND 255[/code] is 1 less than ... full range of a byte (0..255).

    I ...
    BloodBaz BloodBaz July 2020 Assembler
  • this code wont give me a random starfieldim using a peice of code that ive copied from a book, ignore most of it as it is redundant. for some reason i get a strange random starfield instead …

    ... /> call random
    and 255[/code]

    Clearly, ... a random (0.255) value in A to (0..175). It ... 15, 31, 63, 127, 255). Secondly, even if it did ...
    Secondly, [code]AND 255[/code] is 1 less than ... full range of a byte (0..255).

    I ...
    digital digital July 2020 Assembler
  • Pseudocode for CIRCLE algorithm?Can anyone provide me with the pseudocode for the Spectrum's CIRCLE algorithm? My machine code knowledge isn't up to reading the ROM routine. I'm try…

    ... .. + 32767)
    ; A = radius (0..255); at 0 - point

    http://www ...
    Serzh Serzh August 2020 BASIC
  • ULAPLUS on ZX-Evo!It was really easy for us to add it. So it is here fresh in our repository: [url]http://pentevo.googlecode.com/svn/avr/current/default/zxevo_fw.bin[…

    ...
    BIT - effect
    0 - ULAplus palette on (1) / ... greyscale: on (1) / off (0) (same as turing the color ... />
    [code]0-2: Screen mode. 000= ... 5)
    100=screen 0, 101=screen 1, 011 ... FF
    LD A, ; 0..255
    OUT (C), A
    milkyway milkyway June 2021 Announcements
  • How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…

    ... ,1,ink,4,paper,2,"Text" ;my custom string
    defm ... ,3,paper,6,"Second Text"
    defb 255
    [/code]

    text anyway. Yeah, it's the ...
    Paradigm Shifter Paradigm Shifter June 2022 Development
  • How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…

    ... the string (either put a 0 byte at the end of ... this

    str db "text", 0

    or OR the ... this

    str dc "text" ; dc ORs the last byte ...
    Paradigm Shifter Paradigm Shifter June 2022 Development
  • How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…

    ... the string (either put a 0 byte at the end of ... this

    str db "text", 0

    or OR the ... this

    str dc "text" ; dc ORs the last byte ...
    Kotek Kotek June 2022 Development
  • How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…

    ... /> G db 0,60,126,126,255,255,255,255
    D db 255,255,255,255,126,126 ... ,60,0
    L ... 255,63,31,7,1,0,0,0
    LD db 0,0,0,0,0,0,255,255
    LG db 255
    Kotek Kotek July 2022 Development
  • New Functions for Sinclair BasicA total of 52 new functions can be added to Sinclair BASIC; 26 numeric functions (A-Z) and 26 string functions (A$-Z$). Owing to the internal structu…

    ... be converted into line 0 with POKE 23756,0). The more complicated ... dealing with 8-bit numbers (0-255) while their Beta BASIC equivalents ... [/i] = 8-bit positive integer (0-255)
    [i]posint16[/i] = ... 16-bit positive integer (0-65535)
    [i]string1[/i ...
    chev chev November 2004 Sinclair Basic
  • creating UDGs in BASIC?I've been playing around with BASin, which is glorious, and my BASIC knowledge is flooding back but for the life of me I cant remember how to make UD…

    ... ;

    10 for x = 0 to 7
    20 read ... /> 50 data (8 values from 0-255 etc)

    I've ...
    Bluce_Ree Bluce_Ree April 2006 Sinclair Basic
  • Pixel Explosion CodeJust a little snippet to cause explosive effects. It uses table lookups for the screen address, and can handle up to 32 pixel particles. A particle…

    ... /> ld l,b ; l=xpos (0-255)
    ld h,screen_xpos_table/256 ... ,1,0,1,0,1
    defb 118,96,-1,0,0,1,0,1 ... ,-1,0,2,0,1
    defb 128,96,0,-1,0,2,0,1 ...
    robpearmain robpearmain September 2006 Development
  • z88dk Help neededI'm starting my tests with z88dk from a very simple example from a tutorial in speccy.org. It works fine but when I make the smallest modification t…

    ... br />
    struct sp1_Rect cr = {0, 0, 32, 24};

    main ... , 16, 0, 0);
    p.dx = 0;
    p.dy = 0;
    sp1_Invalidate ... &cr, p.frameoffset, 0, 0, p.dy, p.dx);
    0, 0, enemigos[i].dy, enemigos[i ...
    Emlyn_Hughes Emlyn_Hughes January 2009 Development
  • Need help with interrupts againI'm fighting to understand how interrupts code handling works I'm trying to set my simple own interrupt routine, as I don't want to be dependent on …

    ... *256+N) (N: random value 0-255)
    ;it is memory area ... 23296-23551 filled with 255
    ;so the intterrupt ... start will be at address 255*256+255 = 65535
    ;the ... next byte from 65535 is byte 0 which ...
    Ralf Ralf November 2009 Development
  • Z88DK/SP1 library u_malloc() questionHi All, It may possibly be more appropriate for me to post this on the Z88DK forum, but I know quite a few WoSSers have used Z88DK, so here goes:- …

    ... /> DEFB 255, 0,255, 0,255, 0,255, 0
    DEFB 255, 0,255, 0,255, 0,255, 0

    DEFB 1,254, 0, 3, 0,253 ... /> DEFB 255, 0,255, 0,255,
    Digital Prawn Digital Prawn December 2010 Development
  • A z88dk + sp1 demo (with source)Since nowadays people are still wondering about how difficult it is to make something in z88dk, I thought I just put a very simple demo to show how e…

    ... }, {0,128,120,2,0}, {0,128,56,2,0}, {0,96,88,2,0}, {0,96 ... ,120,2,0},
    {0 ... ,96,56,1,1}, {0,160 ... ,88,2,0}, {0,160,120,2,0}, {0,160,56,2,0}, {0,0,0,2,0 ...
    Timmy Timmy January 2012 Development
  • Random number from a rangeHow can I generate in assembly a random number from a range, let's say 0-21 or 0-57? There are generators which make it 0-255. By using bit masks I…

    How can I generate in assembly a random number from a range, let's say 0-21 or 0-57?

    There are generators which make it 0-255.

    By using bit masks I can make it 0-127,0-63,0-31 and so on. But what if my range isn't that "equal"?
    Ralf Ralf September 2012 Development
  • What's the correct Spectrum colour palette?Prompted by the recent SCR-to-GIF conversion thread, I was pondering writing one in Z80 assembler. As I did a LZW compression routine a while ago tha…

    ... 0 0 0 0 0 0
    BLUE 0 0 202 0 0 255
    RED 202 0 0 255 0 0
    MAGENTA 202 0 202 255 0 255 ...
    Battle Bunny Battle Bunny November 2012 Development
  • Elliptical ChallengeSubsequent to the recent "Graph Plot" thread, I wrote this general purpose ellipse drawing routine which will plot (although it doesn't actually use …

    ... x coordinate - 0-255
    k = CHR$ centre y coordinate - 0-255
    ... a = CHR$ 1/2 length of x axis- 1-255 ... /2 length of y axis- 0-255
    ellipse = address of ... = xh
    rst $28 ; : 0.5,b,1,a2,xh ...
    Battle Bunny Battle Bunny November 2012 Development
  • Optimal shifting for set pixel?Hi, I'm optimizing my set pixel code. For speed. But without using partitioned memory (i.e. a table on 256 byte boundary) I have optimal memory addr…

    ... ,#x ; symbolic. a is x (0->255)
    and #7 ; remainder ... of division by 8 (0->7 ... counter
    xor a ; a=0
    scf ; our shift bit ...
    tstih tstih May 2014 Development
  • Boomshine in SpecBASHere's a little game called "Boomshine": [url]http://www.k2xl.com/games/boomshine/[/url] It's a really nice, relaxing puzzle game about exploding b…

    ... HSV f,blobs(f,7),255,255
    90 LET blobs(f ... )=-1: LET gamestate=0: LET wongame=0: LET np=0
    140 REM ... ;=target AND wongame=0 THEN PALETTE HSV 0,180,255-palinc,palinc: INC ... DEC palinc,4: PALETTE HSV 0,180,255-palinc,palinc: IF palinc ...
    Dunny Dunny November 2014 Sinclair Basic
  • 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
  • Elite - Galaxy Creator Pokes.So 8 meagre galaxies are not enough for you? Tired of visiting the same old 2048 planets over and over? Say no more, these "Galaxy Creator" pokes wil…

    ... . Simply pop a number between 0-255 behind one or all of ...
    Ersh Ersh February 2016 Games
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