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<1…18192021222324…34>
  • Machine Code Microdrive File LoaderI've been experimenting with transferring games to run from microdrive. Typically I like to see a loading screen while things are happening, and I li…

    ... ;
    main1 ld (err_sp),sp
    ld hl,main2
    ld (hd_11),hl ... djnz tabinc
    ld de,jumptab
    ld bc,rom2tab-rom1tab ; ...
    ;
    ld a,"M"
    ld (l_str1),a ; signify ... br /> ld h,(ix+$56)
    ld (hd_0d),hl
    ld e,(ix ...
    jp jp June 2010 Development
  • Optimize this assembly?Aiming for Variable*192 -> HL In the first case, I came up with the obvious method - *128 +*64: [code] ld a, (variable) ;13 ld h,0 ; 7 ld l,…

    ... />
    [code] ld a, (variable) ; 13ts
    ld h, a ; 4ts
    xor a ; 4ts
    srl h ; ... /> ld b, h ; 4ts
    ld c, a ; 4ts
    srl h ; ... 8ts
    rra ; 4ts
    ld l, a ; ...
    Marko Marko August 2010 Development
  • Optimize this assembly?Aiming for Variable*192 -> HL In the first case, I came up with the obvious method - *128 +*64: [code] ld a, (variable) ;13 ld h,0 ; 7 ld l,…

    ... ].

    [CODE]ld a, (variable)
    ld b, a
    rra ... .5

    rrca
    ld b, a

    and ... , b
    and %00111111
    ld h, a[/CODE]

    T ... ) clear carry flag
    13 LD A, (NN)
    10*4 ...
    ajmoss ajmoss August 2010 Development
  • Optimize this assembly?Aiming for Variable*192 -> HL In the first case, I came up with the obvious method - *128 +*64: [code] ld a, (variable) ;13 ld h,0 ; 7 ld l,…

    ... instead:
    [CODE]ld a, (variable)
    ld b, a
    rrca ... , b

    rrca
    ld b, a
    and %11000000 ... , b
    and %00111111
    ld h, a

    ; 59 T ...
    ajmoss ajmoss August 2010 Development
  • Optimize this assembly?Aiming for Variable*192 -> HL In the first case, I came up with the obvious method - *128 +*64: [code] ld a, (variable) ;13 ld h,0 ; 7 ld l,…

    ...
    ld a,(val) ;13
    ld h,a ;4
    ld l,0 ...
    rr l ;8
    ld h,a ;4
    ;=60
    Grimmy Grimmy August 2010 Development
  • Optimize this assembly?Aiming for Variable*192 -> HL In the first case, I came up with the obvious method - *128 +*64: [code] ld a, (variable) ;13 ld h,0 ; 7 ld l,…

    ... ,a ;4
    ld a,(val) ;13
    ld h,a ;4
    rr l ;8
    ld h,a ;4
    ;=57
    Metalbrain Metalbrain August 2010 Development
  • Optimize this assembly?Aiming for Variable*192 -> HL In the first case, I came up with the obvious method - *128 +*64: [code] ld a, (variable) ;13 ld h,0 ; 7 ld l,…

    ...
    ;xor a ;0
    ;ld l,a ;0 - Replace these ... ,0 ;7
    ld a,(val) ;13
    ld h,a ;4
    rr l ;8
    ld h,a ;4
    ;=56
    LD A,(VAL) anywhere I please ...
    Gedlion Gedlion August 2010 Development
  • Keyboard demoHere's a preview of a new keyboard for the special fx engine. Press any key to start/restart. [url]http://dl.dropbox.com/u/9498358/fire_keyboard.sn…

    ... /> rrca
    rrca
    ld h, a
    and $e0
    or $58
    ld h, a
    ex af, af ... />
    ld a, h
    sub $08
    ld h, a
    ld a, l ... />
    ld a, h
    add a, $08
    ld h, a
    FrankT FrankT August 2010 Development
  • Keyboard demoHere's a preview of a new keyboard for the special fx engine. Press any key to start/restart. [url]http://dl.dropbox.com/u/9498358/fire_keyboard.sn…

    ... RRCA
    RRCA
    LD H, A
    AND $E0
    OR $58
    LD H, A
    EX AF, AF ...
    LD A, H
    SUB $08
    LD H, A
    LD A, L ...
    LD A, H
    ADD A, $08
    LD H, A
    FrankT FrankT August 2010 Development
  • Keyboard demoHere's a preview of a new keyboard for the special fx engine. Press any key to start/restart. [url]http://dl.dropbox.com/u/9498358/fire_keyboard.sn…

    ... RRCA
    RRCA
    LD H, A
    AND $E0
    OR $58
    LD H, A
    EX AF, AF ...
    LD A, H
    SUB $08
    LD H, A
    LD A, L ...
    LD A, H
    ADD A, $08
    LD H, A
    kgmcneil kgmcneil September 2010 Development
  • Machine code issue...Hi Folks, My trials with MCODE continue and I am stuck. I wrote the following program in BASIC to simply POKE an attribute byte in to a "box" on th…

    ... e.g.

    [CODE] LD HL,(64000)
    SLA HL ... /> [code]
    ld a,(64000)
    ld h,0
    ld l,a
    Dr BEEP Dr BEEP September 2010 Sinclair Basic
  • Machine code issue...Hi Folks, My trials with MCODE continue and I am stuck. I wrote the following program in BASIC to simply POKE an attribute byte in to a "box" on th…

    ... /> [code]
    ld a,(64000)
    ld h,0
    ld l,a
    Paddy Coleman Paddy Coleman September 2010 Sinclair Basic
  • ccompletly baffeled machine codeHi everyone, BEFORE you ask i have not asked help for loads of problems i have recently now encountered and i figured the problems out myself, hones…

    ... LD A,B
    AND $F8
    ADD A,$40
    LD H ... ,A
    LD A,B
    ... ADD A,C
    LD L,A
    RET< ...
    rich_chandler rich_chandler September 2010 Sinclair Miscellaneous
  • ccompletly baffeled machine codeHi everyone, BEFORE you ask i have not asked help for loads of problems i have recently now encountered and i figured the problems out myself, hones…

    ... /> LD A,B
    AND $F8
    ADD A,$40
    LD H ... ,A
    LD A ,B
    AND ...
    Robin Robin September 2010 Sinclair Miscellaneous
  • Sprite RoutineI was wondering if anyone could point me in the direction of a really basic example of a per-pixel sprite routine? Preferably commented. The screen …

    ...

    DrawBall
    LD A,(DE) ;one line of ... L

    LD A,(DE) ;read graphics source ... /> INC H ;go to new line
    LD A,H
    ... AND 00000111B
    OR A ;h=0 ... /> LD A,H
    SUB 8
    LD H,A; decrease h if we ...
    Ralf Ralf October 2010 Development
  • Opinion on new 128K only gamesHello, Being new to the WOS community, I am unclear on the attitude towards 128K only software, that is; Is there a strong need to support the 48K m…

    ... />
    ld hl,tsklist_ptr
    ld a,[hli]
    ld h,[hl]
    ld l ... />
    ld hl,sprlist_infront_ptr
    ld a,[hli]
    ld h,[hl]
    ld l ... />
    ld hl,sprlist_behind_ptr
    ld a,[hli]
    ld h,[hl]
    ld l ...
    ASM ASM October 2010 New game ideas
  • Spectrum 128K RS232 to PC serial cableIf you have read some of my recent posts then you will know that I am eager to link my Spectrum +3 to a PC. This will be done by wiring a standard PC…

    ... /> zx232 di ; *IMPORTANT*

    ld a,e ; Check for NULL ... (c),a
    ld bc,49149
    ; ld a,01000000b ; Input ( ...

    ; ------------

    data ld d,4 ; 38400 BAUD
    ld l,a
    ld a,h
    xor a,0ABh
    ld h,a ...
    ASM ASM October 2010 Hardware
  • Spectrum 128K RS232 to PC serial cableIf you have read some of my recent posts then you will know that I am eager to link my Spectrum +3 to a PC. This will be done by wiring a standard PC…

    ... 16384 to 65279. The last 256 BYTES are reserved for the ... be used to store those 256 bytes and a small Z80 ... db 33,0,65 ; ld hl,16384+256
    db 17,0 ... ,255 ; ld de,65280
    db ... 1,0,1 ; ld bc,256
    db 0EDh,176 ; ldir ...
    ASM ASM October 2010 Hardware
  • Print text in assemblyHello, a perhaps simple question: I would like to print a text string on the screen and I wonder how to do that in the most easy way? I seem to re…

    ...
    PRINTA LD L,A
    LD H,0
    ... PRTA_1
    LD HL,(PRTPOS)
    LD A,H
    RRCA< ... A,$40
    LD H,A
    LD A,B
    ...
    rich_chandler rich_chandler October 2010 Development
  • Rotating Register PairsWhat's the best way to rotate left (or right) a register pair, so that (eg.) FE76 becomes E76F (or 6FE7)? I presume that passing the intermediate bit…

    ...

    test_array ld hl,array
    ld de,0123h ; 12 BIT ... l ; *Store array pointer
    ld d,h ;

    inc hl ...
    ld a,(hl) ; 34h
    ... dec hl
    ld l,(hl) ; 12h
    ld h,0 ; 0012h
    ASM ASM October 2010 Development
  • Games in machine codeHi everyone, How do go about doing multiple shots like a machine gun, do you have to store every x and y position of each bullet? When you kill som…

    ... />
    lz77: ld [stack_ptr],sp
    ld sp,hl
    add ... /> or a,$D0
    ld h,a
    jp .loop< ... br /> .lz5: ld a,[bc]
    ld [de],a
    ld [hli],a ... ld a,h
    and a,$0F
    or a,$D0
    ld h ... ,a

    ld a,b
    ASM ASM October 2010 Development
  • Spectrum 128K RS232 to PC serial cableIf you have read some of my recent posts then you will know that I am eager to link my Spectrum +3 to a PC. This will be done by wiring a standard PC…

    ... ,h
    jr nz,fail

    ld de,mode ; Header
    ld ... ,fail
    ld a,(check+1)
    cp a,h
    jr ... L?
    exx
    ld a,h
    exx
    cp a ... /> jr nz,fail ; CRC H?

    ld a,(mode) ; Exec?
    ASM ASM November 2010 Hardware
  • Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …

    ... =start of font
    LD H,0
    LD L,A
    ADD ...
    OR #58
    LD H,A
    LD A,(ATTRP) ; Get current ... screen
    LD A,H
    ADD A,7
    LD H,A ; Step ... to next 1/3 of screen
    SAVEP LD ...
    Jonathan Harston Jonathan Harston November 2010 Development
  • Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …

    ... =start of font
    LD H,0
    LD L,A
    ADD ...
    OR #58
    LD H,A
    LD A,(ATTRP) ; Get current ... screen
    LD A,H
    ADD A,7
    LD H,A ; Step ... to next 1/3 of screen
    SAVEP LD ...
    Jonathan Harston Jonathan Harston November 2010 Development
  • Why doesn't my routine work?I have a "level" defined by 504 bytes (28 squares across x 18 squares down) I'm trying to write a routine that will take an X,Y coordinate in pixels…

    ... /> in assembly:
    [code]
    ld a, (x)
    and %11111000 ... /> ld a, (y)
    ld l, a
    ld h, 0
    ld d, h
    ld ... /> add hl, hl ;*28
    ld de, displacement
    add hl ...
    Fikee Fikee December 2010 Development
  • Recent talk of developing new SpectrumsHi all, I can see from a few threads on here that some Wossers like Vasil and Aien 8 are interested in developing more powerful Spectrums or improvi…

    ...
    [CODE]
    inc h
    ld a,h
    and 7
    jr nz, cont
    ld ... ,cont
    ld a,h
    sub 8
    ld h,a
    ... like
    [CODE]
    ld a,32
    add l ... /> ld l,a
    ld a,0
    adc h
    ld h,a ...
    TVzombie TVzombie January 2011 Hardware
  • Recent talk of developing new SpectrumsHi all, I can see from a few threads on here that some Wossers like Vasil and Aien 8 are interested in developing more powerful Spectrums or improvi…

    ... someting like
    [CODE]
    ld a,32
    add l ... br /> ld l,a
    ld a,0
    adc h
    ld h,a ... with:

    [CODE]
    ld a,32
    add l ...
    ld l,a
    jr nc ... of:

    [CODE]
    ld de, 32
    add hl ...
    Metalbrain Metalbrain January 2011 Hardware
  • Recent talk of developing new SpectrumsHi all, I can see from a few threads on here that some Wossers like Vasil and Aien 8 are interested in developing more powerful Spectrums or improvi…

    ... ,othersegbranch
    ld a,h
    sub 8
    ld h,a
    ...
    ld a,h
    sub 8
    ld h,a
    ...
    and 0F8h
    ld h,a
    ...
    [/CODE]
    TVzombie TVzombie January 2011 Hardware
<1…18192021222324…34>

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