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  • ZX-Assembler version 0.8 (beta) releasedDear readers, yesterday I've published ZX-Assembler in its first version 0.8. It offers you some interesting features, even if I know there are …

    ... br /> org 24000
    ld hl,50000
    ld de,55000 ... />
    org 24500
    push hl
    call 24000
    pop ... address counter jumps up and down.

    Imagine, the ... Z80 instructions e.g. ld hl,50000 may be converted into ...
    clausjahn clausjahn August 2015 Emulators
  • Crash office in Ludlow.I'm off to Ludlow soon and thought I'd take a walk passed to old Crash magazine office. I believe that it was located at 1 / 2 King street. I took a …

    ... />
    The later building was down Temeside 2 minutes from were ... !2e0!7i13312!8i6656!6m1!1e1?hl=en
    Dave_C Dave_C August 2015 Sinclair Miscellaneous
  • z80 assembly helpEver since I was a child I wanted to program my zx81 then my zx spectrum + 2. However, it was such a mystical beast and I only ever used BASIC not kn…

    ... br /> [code]
    ld hl, ycoord ; hl now holds the address "ycoord ... "
    dec (hl) ; decrease the value stored ... move the address one location down), but rather "dec (ycoord ... the two lines "ld hl, ycoord / dec (hl)".

    ...
    lunarul lunarul September 2015 Development
  • 40 Column Printing RoutineI've written a 40 column printing routine, which I'd like to share... It's my first piece of 'public' code so go easy on me! I don't think it is a…

    ... nibble ;
    ; hl - screen address ;
    hl ; save hl in de
    ld hl ... hl), a ; store on screen
    inc h ; move down ...
    Kiwi Kiwi September 2015 Development
  • Games not compatible with the 128+ & grey +2Like the +2A & +3 thread, there are a few games that do not work correctly on the original 128+ and the grey +2. Two games that I know of that wil…

    ... hl,num and is harmless
    notjp ldir ; copy the decrypter down ...
    inc hl ; go past the ... inc hl
    inc hl
    ld (dcrlp+1),hl ; hl is now ... length
    ldir ; copy pokes down
    ;
    jp ldgme ; ...
    jp jp October 2015 Games
  • Full-screen 32 columns bicolor engine NIRVANA+I'm glad to announce the release of [b]NIRVANA+ ENGINE[/b], providing support for bicolor graphics (multicolor 8x2) in 32 columns for all standard Sp…

    ... ;

    __asm
    ld hl,(_dummy)
    ld de,(_dummy ... (_VDPControlPort),a

    ld hl,(_dummy)
    ld de,(_dummy ... asm definition of NIRVANA_start comes down to "defc NIRVANA_start = 64995". The ...
    Alcoholics Anonymous Alcoholics Anonymous December 2015 Brand new software
  • Small Machine Code Routines Which Maybe UsefulAs part of creating Flynn's Adventure in Bombland I created a lot of little routines to do all sorts of things. A lot of these I created based on inp…

    ... br /> add hl,hl
    add hl,hl
    add hl,hl
    add hl,bc
    ex de,hl ;now HL at screen, DE at graphic ... br /> add hl,bc
    ld a,(hl)
    inc hl
    ... ld h,(hl)
    ld ...
    R-Tape R-Tape December 2015 Development
  • Spectrum Screen RAM layoutHi there The spectrum screen layout is rather odd. It seems to be arranged into 3 256 byte groups. If I have an x (horizontal) coordinate (from…

    ... 256 to it to move down one pixel row within that ... in HL, which is equivalent to adding 256, to move down one ... the character cell. To move down to the next character position ...
    joefish joefish December 2015 Development
  • Spectrum Screen RAM layoutHi there The spectrum screen layout is rather odd. It seems to be arranged into 3 256 byte groups. If I have an x (horizontal) coordinate (from…

    ...
    ;
    nextlinedown: ;move DE down a line on screen
    HL at ATTRS
    ld a ...
    R-Tape R-Tape December 2015 Development
  • British Foods not generally available in the USQuality Street! --Haven't had that since I was a child Trifle! --Same Shreddies! --No malted wheat cereal as far as I know

    ... &oe=UTF-8&hl=en-gb&client=safari ... &oe=UTF-8&hl=en-gb&client=safari ... been there. Used to go down there and Weston-Super-Mare ... and they'd knocked it down and built flats. They seemed ...
    Grunaki Grunaki January 2016 Chit chat
  • British Foods not generally available in the USQuality Street! --Haven't had that since I was a child Trifle! --Same Shreddies! --No malted wheat cereal as far as I know

    ... &oe=UTF-8&hl=en-gb&client=safari ... &oe=UTF-8&hl=en-gb&client=safari ... been there. Used to go down there and Weston-Super-Mare ... and they'd knocked it down and built flats. They seemed ...
    Scottie_uk Scottie_uk 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…

    ... br /> [code]
    MAIN LD HL,50213 ; MAP START ADDRESS
    ADD HL,BC ; GET TO THE ... br /> CALL LOWER ; DROP DOWN A SCREEN LINE
    ... THE MAP
    LD HL,22528 ; FIRST ADDRESS OF ... SCREEN ATTRIBS
    LD (HL),A ; LOAD THAT ADDRESS ...
    mulder mulder January 2016 Development
  • Variable sized tiles /tile routineHow would you do a variable sized tile routine where the tiles have position variables too? Thanks would be interested to learn :)

    ... /> Loop:
    ld hl,tiles
    call drawlocation< ... /> drawlocation:
    ld e, (hl) ;- READ A BYTE - X POS ... OF WORD
    inc hl ;- MOVE FORWARD
    ... pop hl

    ld de,4 ;move down to ... of tiles
    add hl,de
    jp ...
    alienbanana alienbanana January 2016 Development
  • Opus DiscoveryWould anyone have any materials about programming the Opus Discovery disk? I know it overrides ROM and uses microdrive commands, but I am more into b…

    ... /> 1. These params are laid down in a table which (default ... activated. The exact address in HL depends on the ROM version ...
    roko roko February 2016 Development
  • 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…

    ... /> [code]
    ld a,(hl)
    (some logical, arithmetic or ... left/right operation)
    ld (hl),a
    [/code]And ... a loop which cycles HL through all addresses that ... Spectrum).

    Break down problem in smaller problems, once ...
    RetroTechie RetroTechie March 2016 Development
  • Best beeper player with good trade-off between sound quality and CPU timeHi all.. I'm toying with the idea of writing a small demo/intro on the 48k Speccy. Last time I did this I cheated and used an AY add-on but this t…

    ... same pattern is followed. Set HL = song address, call tritone to ... , use the return value in HL to play the next row ... . If HL = 0 after the tritone call ... loop had to be slowed down so an adjustment to tempo ...
    Alcoholics Anonymous Alcoholics Anonymous March 2016 Development
  • ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …

    Knocked four bytes off, down to 104 bytes. Relocateable and ... do something like;
    LD HL,returnaddress
    LD (zx7ret+1 ... ),HL
    JP zx7
    returnaddress:< ...
    FrankT FrankT April 2016 Brand new software
  • Function with push and popIm trying to see if I understand push and pop when it comes to using to pass parameters to functions: [code] LD HL,16384 LD A,5 Push AF Ld A…

    ... about fastcall functions half way down this page:
    https:// ... /> ld hl,5
    push hl
    ld hl,7
    push hl
    push hl
    ld hl,buffer ; address to write ... string to
    push hl
    ld hl,12345 ; number to ...
    Alcoholics Anonymous Alcoholics Anonymous 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…

    ... tends to be slowed down to very insane ... /> [code]
    ld sp, hl
    pop de
    pop ... pop de
    pop hl
    ld sp, #(constant ... start + 12)
    push hl
    push de
    Hikaru Hikaru 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…

    ... large bunch of POP HL: LD (NN),HL. 13T/byte uncontended, same ... of POKEing the LD HL,NN: PUSH HL thing effectively...)[/color]
    down to very insane numbers by ... whole instruction that's slowed down, or just the write part ...
    Hikaru Hikaru 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…

    ... bunch of POP HL: LD (NN),HL. 13T/byte uncontended ... contiguous you can get down to 10.5T/byte ... bunch of "LD HL,nn; PUSH HL" instructions. Drawing into ... would update the "LD HL,nn" instructions and change ... changing the particular "PUSH HL" instructions back to " ...
    gp2000 gp2000 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…

    ... large bunch of POP HL: LD (NN),HL. 13T/byte uncontended, ... -contiguous you can get down to 10.5T/byte ... a bunch of "LD HL,nn; PUSH HL" instructions. Drawing into ... and an ADD HL,rr for stepping down a line, or ... routines are further slowed down by the need of ...
    Hikaru Hikaru April 2016 Development
  • Rainbow Generator for 48K Spectrum using PUSHThis is what I came up with from [B]gasman[/B]'s suggestions. It's stable in ZXSpin and ZX32 simulating a 48K Speccy. Anyone like to try it on the …

    ... time with:

    POP HL
    POP AF
    POP ... time:

    LD SP,HL
    PUSH AF
    EX ... DE,HL
    LD SP,HL
    PUSH BC ... if you want to go down the self-modifying code route ...
    joefish joefish May 2016 Development
  • Where could I buy a B1367Y transistor in the UK?I'm after a B1367Y transistor, must be T-220 package type that can be mounted to a heatsink. Anybody know where I can buy them in the UK? Tried Googl…

    ... a hard transistor to track down probably why the last owner ... ://translate.google.co.uk/translate?hl=en&sl=pl& ... ://translate.google.co.uk/translate?hl=en&sl=pl& ...
    Your Spec-chum Your Spec-chum June 2016 Chit chat
  • Character Based SpritesHi, I'm working through Jonathan's excellent guide to writing games, and have mastered the animation of single UDGs. Before or move onto Pixel…

    ...
    draw_tile ;arrive with HL pointing at graphic, DE at ...
    call nextlinedn ;move DE down one line
    djnz ptlp ... colour_tile ;DE pointing at attributes, HL at colours

    ... ex de,hl ;better with HL at attributes, DE at ...
    daveysludge daveysludge July 2016 Development
  • Reading sequential key pressesI am thinking about writing a quick game and have an idea that requires me to read alternate key presses. I’m thinking along the lines of Daley Thomp…

    ... br /> ld hl, flag
    ld (hl), e ; ... /> Loop ld e, (hl)
    ld bc, 57342 ... have been up and down
    xor e ... />
    ld (hl), a ; a will be ...
    Mr Millside Mr Millside July 2016 Development
  • Reading sequential key pressesI am thinking about writing a quick game and have an idea that requires me to read alternate key presses. I’m thinking along the lines of Daley Thomp…

    ... doing XOR E, or XOR (HL).
    XOR will toggle the ... keys have been up and down
    xor e
    jp ... keys have been up&down.
    If no keys are ...
    RMartins RMartins July 2016 Development
<1…18192021222324…34>

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