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<1…20212223242526…34>
  • 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, …

    After 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, and can form the basis for a number of game types, one of which being [url=http://www. ...
    Dunny Dunny October 2015 Sinclair Basic
  • Text scroller and custom fontYesterday I was testing this text scroll routine taken from Jonathan Cauldwell's Intro Maker (labels have been inserted to allow partial code relocab…

    ...
    JP L_35387
    L_35413: DEC C
    L_35414: LD HL ...
    L_35425: RL (HL)
    DEC L
    DJNZ L_35425
    Alessandro Grussu Alessandro Grussu January 2016 Development
  • Matthew Smith's Andre's Night Off in C&VG - did he really write it?Despite it being written in BASIC, Andre's Night Off is not very good - so what happened exactly? Was the hyperbole surrounding the type-in so much h…

    ... to Z80 (Sinclair User 33 Dec 1984 pp89). So why turn ...
    SteveP SteveP February 2016 Games
  • Help! I'm learning Machine Code...Having decided to take the plunge and learn to machine code a while ago, I have started in earnest using the much recommended 'Mastering Machine Code…

    ... at 9C40:
    LD (5CB0), SP
    LD B, 01
    JR NZ, 5
    LD SP, (5CB0)
    RET
    INC ...
    namtip namtip February 2016 Development
  • 48K Memory MapHi, I'm having some trouble understanding the top of the 48K Memory Map. From reading elsewhere I have this as the memory map: 0 to 16383 - …

    ... the section marked 3Eh (62 DEC) mean?


    Thanks
    jonesypeter jonesypeter 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…

    ...
    [code]
    ld sp, hl
    pop af < ... pop hl
    ld sp, #(constant value of scanline start ... hl, bc
    ld sp, hl
    pop af ... pop hl
    ld sp, #(constant value of scanline start ...
    Sol_HSA Sol_HSA April 2016 Development
  • Detecting TR-DOS w/o relying on system variablesOK, I know it's much easier to do this simply by checking whether the BASIC program area has moved or some specific pattern in the sysvars etc (somet…

    ... ;Place RET to #4000.
    dec hl ;Set up the registers ...
    Hikaru Hikaru July 2016 Development
  • Basic Screen Shadow QuestionHello, I've been porting a game to the Spectrum from another platform. So far so good and I have per pixel screen scrolling working really nicely …

    ... ), b
    inc hl
    dec de
    ld a,d ... ), b
    inc hl
    dec de
    ld a,d ...
    pointblnk pointblnk August 2016 Development
  • Must be missing the point - machine code... Hi Folks, Trying my hand at machine code again but falling at the first hurdle. I hand crafted the following to run at address 62000 and the co…

    ... ), A
    INC H
    DEC C
    JR NZ, Loop2 ... /> INC L
    NOP
    DEC B
    JR NZ, Loop1 ...
    Paddy Coleman Paddy Coleman September 2016 Development
  • Starting lives for Space Raiders ?:) I was wondering if anyone could point me in the right direction for this please. I've examined the code quite a bit but I'm unable to quite figur…

    ... , (24611)
    [b]25962[/b] DEC A ;[i] < Lose a ... an odd wraparound effect (changing DEC A to INC A is ...
    spider spider November 2016 Games
  • Code optimisation! 16bit number to 5 digit stringJust for interest this one, any thoughts on how to make this as fast as possible? Little optimisations to this routine or a complete reimagining? …

    ... and do next digit
    dec l
    jp lp
    dec de ;decrease number counter
    R-Tape R-Tape December 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…

    ... ),A
    INC HL
    DEC BC
    LD A,B ...
    ivanb303 ivanb303 December 2016 Assembler
  • Scrolling loader counter in 85 T-States?Would it be possible to write a scrolling loader counter in 85 T-States? I have a custom screen load routine that loads attribute first, then the …

    ... a, $03 ; 07ts
    dlyloop: dec a ; 04ts
    jr nz ...
    FrankT FrankT February 2017 Assembler
  • 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…

    ... it on screen

    dec l ;back one cell to ...
    Ast_A_Moore Ast_A_Moore February 2017 Development
  • The HL Register Pair Naming. An Observation.This isn’t really a question or a tip. Just an observation about the naming convention of the registers in the Z80 CPU. It seems that every register …

    ... register pairs:

    [b]SP[/b]—[b]S[/b]tack ...
    Ast_A_Moore Ast_A_Moore March 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 […

    ... , BC
    POP AF
    DEC A
    JR NZ,LOOP ...
    ivanb303 ivanb303 March 2017 Assembler
  • SpecBAS 0.900 ReleasedAgainst my better judgement, here's 0.900. It's got lots and lots new, but mostly the new shiny is the editor. You can indent your code, you can e…

    ... you like
    Inline inc/dec/mul/div to LET - LET ...
    Dunny Dunny April 2017 Sinclair Basic
  • High score table routineI wrote this general purpose high score table routine. It stores 5 scores and displays them alongside the player names, which are 8 characters long. …

    ... new player's name...
    DEC A ; ...otherwise decrement A until ... A
    RET Z
    DEC A

    MOVE_2:
    RET Z
    DEC A

    MOVE_1:
    Alessandro Grussu Alessandro Grussu July 2017 Assembler
  • Power Play Joystick InterfacePower Play Joystick Interface for the ZX Spectrum. This is a Kempston compatible interface. Address decoding Any IO address where A5 is low... …

    ... use port 1F hex = 31 dec = 00011111 bin.

    Joystick ...
    1024MAK 1024MAK July 2017 Hardware
  • Flood Fill IssueHi Folks, Came across the following Flood Fill routine by John Metcalf: [code]; scanline fill by John Metcalf ; call with d=x-coord, e=y-coo…

    ... ,goright 60021 28 0D
    dec d 60023 15
    rlc ... B6 EA
    dec e 60046 1D
    dec e 60047 1D ...
    Paddy Coleman Paddy Coleman August 2017 Development
  • 1k Chess (was the 924 bytes thing!)Hi, I've decided to do a major rewrite of large parts of the code for the isometric Chess thing that I've been messing with. It got to the point, …

    ... /> restore_lp0:
    rl (hl)
    dec l
    djnz restore_lp0
    Arkannoyed Arkannoyed September 2017 Development
  • Is it safe to use TSTACK and OLDSP from a USR nnnnn environment?Hi guys, I've recently revived an old project of mine which gives the Spectrum +3 a new set of customised menus (see this thread [url="https://www.wo…

    ... up my own store for SP, and a small area for ...
    The_Bert The_Bert October 2017 Development
  • Other than using attributes what other ways to detect collisions, when using char based movement?So I'm slowly working out the bits and pieces to write a game completely in assembly. I've been using attributes when writing in BASIC to detect whet…

    ... :
    add hl,bc
    dec a
    jr nz,LOOP ...
    ivanb303 ivanb303 November 2017 Development
  • Free ZX Spectrum inspired comedy show on Wednesday 6 Dec in BirminghamA bit short notice, I know, but myself and some other comedians will be over in the Gunmaker's Arms from 8pm with free stand-up comedy. The main sho…

    A bit short notice, I know, but myself and some other comedians will be over in the Gunmaker's Arms from 8pm with free stand-up comedy.
    The main show is Laura Monmoth's LGBTQZX. It's a show that's fuelled by a love of retrogaming and it's previously ...
    peteprodge peteprodge December 2017 Sinclair Miscellaneous
  • No-tearing (“vsync”) Full Screen FadeSeeing as most screen fades exhibit visible tearing, I wrote my own routine which does away with that problem. Simple, effective, short, and fully re…

    ... custom IM2 routine
    1$ dec de ;until we reach active ... it alone, if 0
    dec c ;else, decrement INK
    Ast_A_Moore Ast_A_Moore December 2017 Development
  • Arkanoid vs Giganoid (Amiga) - Which Is Best?Hi everyone and welcome to the December 2017 edition of the "Which Is Best?" and the last of the 2nd series (started back in Dec' 2015). Last month …

    ... 2nd series (started back in Dec' 2015).
    Last month I ...
    ZEUS ZEUS December 2017 Chit chat
  • Gauntlet II vs Ranarama - Which Is Best?Hi everyone and welcome to the December 2017 edition of the "Which Is Best?" and the last of the 2nd series (started back in Dec' 2015). Last month …

    ... 2nd series (started back in Dec' 2015).
    Last month I ...
    ZEUS ZEUS December 2017 Chit chat
  • Ghosts 'n Goblins vs Ghouls 'n Ghosts - Which Is Best?Hi everyone and welcome to the January 2018 edition of the "Which Is Best?" and the first of the 3rd series (started back in Dec' 2015). Last month …

    ... 3rd series (started back in Dec' 2015).
    Last month I ...
    ZEUS ZEUS January 2018 Games
<1…20212223242526…34>

Latest Posts

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