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  • Learning Assembly LanguageHow easy would it be to learn assembly language for someone who has a decent grasp of Basic? I mean how long do you think it would take before I coul…

    ... /> ld h,0
    add hl,de ; HL points into sprite frame table ...
    ld e,(hl)
    inc hl
    ld d,(hl) ; DE = address of ... a,(de) ; Same again...
    inc de
    xor (hl)
    ld (hl),a ...
    ASM ASM 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…

    ... hl, hl ;*2
    add hl, de ;*3
    add hl, hl ;*6
    add hl, de ;*7 ...
    add hl, hl ;*14 ...
    add hl, hl ;*28 ...
    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]
    ld de, 32
    add hl,de
    [/CODE]

    Metalbrain Metalbrain January 2011 Hardware
  • Sprites masterclassHi All, You guys are probably tired of explaining sprites but I'd like to clarify a few things if possible. I've sorted the vertical aspect of scro…

    ... hl,de
    ld a,(hl)
    xor c
    ld (hl),c ;hl, ... ld e,a
    add hl,de
    inc l ;display in ... ld e,a
    add hl,de
    inc l
    ... hl,de
    ld a,(hl)
    xor c
    ld (hl),c ;hl, ... ld e,a
    add hl,de
    inc l ;display in ...
    R-Tape R-Tape February 2011 Development
  • Zombie Zombie Loading SchemeA quick check of the [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0005866"]Zombie Zombie[/URL] loader identifies it's the RAPID LOADING SYS…

    ... de ; 5d1d d5 $0bts
    push de ; 5d1e d5 $0bts
    ld hl ... 76 00 $0ats
    add hl, de ; 5d39 19 $0bts
    push ... ; 5d9f c1 $0ats
    pop hl ; 5da0 e1 $0ats
    inc ... ; 5e0e 00 $04ts
    inc hl ; 5e0f 23 $06ts
    l_5e10 ...
    jp jp February 2011 Infoseek database
  • yeah - unix for zx spectrumI started a new hobby project. An operating system for ZX Spectrum. A unix clone. Talked to my friend about it and he asked me what if after I'm done…

    ... 2
    ;; affects
    ;; hl,bc,de,af,af'
    ;; ------------------------------------------------------------
    ... e,a
    add hl,de
    ld a,(hl) ; a now has ... a
    ld hl,_kbd_buffer
    add hl,de ; hl points to kbd buffer ...
    tstih tstih March 2011 Development
  • RFC: 64 column font codeIn BASIC, type CLEAR 49999 then import the code at 50000. Then type RANDOMIZE USR 50000. This will create a new channel and attach stream #4 to it. A…

    ... hl, hl ; multiply
    add hl, hl ; by
    add hl, hl ; eight
    sbc hl, de ; subtract DE ... to get original x7
    ld de ... ; offset to FONT
    add hl, de ; HL holds address of first byte ...
    chev chev March 2011 Development
  • SE Basic Type-ins^Pete suggested creating a sticky thread for SE Basic discussion. I thought a Type-ins thread might also be useful. Up to the mods if they want to ma…

    ... hl,hl
    add hl,hl
    add hl,hl
    ld de,font_1-$0100
    add hl,de ...
    push hl ... hl,de
    add hl,de
    add hl,de

    next:
    ex de,hl
    chev chev April 2011 Sinclair Basic
  • Why I hate the 80's.Everything that I hate about the 80's can be summed up by the loading screen for this game. [url]http://www.worldofspectrum.org/infoseekid.cgi?id=000…

    ... ://translate.google.com/translate?hl=de&sl=de&tl=en& ...
    XTM of TMG XTM of TMG April 2011 Chit chat
  • Why I hate the 80's.Everything that I hate about the 80's can be summed up by the loading screen for this game. [url]http://www.worldofspectrum.org/infoseekid.cgi?id=000…

    ... ://translate.google.com/translate?hl=de&sl=de&tl=en& ...
    mile mile April 2011 Chit chat
  • yeah - unix for zx spectrumI started a new hobby project. An operating system for ZX Spectrum. A unix clone. Talked to my friend about it and he asked me what if after I'm done…

    ... the optimal way to compare hl to de (both always unsigned)? i ... easier way. something like sbc hl,de and then using some flags ... flag might work but if hl or de has msb equal to ...
    tstih tstih April 2011 Development
  • yeah - unix for zx spectrumI started a new hobby project. An operating system for ZX Spectrum. A unix clone. Talked to my friend about it and he asked me what if after I'm done…

    ... the optimal way to compare hl to de (both always unsigned)? i ... easier way. something like sbc hl,de and then using some flags ... flag might work but if hl or de has msb equal to ...
    AndyC AndyC April 2011 Development
  • yeah - unix for zx spectrumI started a new hobby project. An operating system for ZX Spectrum. A unix clone. Talked to my friend about it and he asked me what if after I'm done…

    OR A; SBC HL,DE

    Then Zero set if equal, Carry set if DE greater, else no carry.
    Woody Woody April 2011 Development
  • Proportional Print Routine...Hi Folks, Does anyone know of a good proportional printing routine for the ZX Spectrum? Ideally I am looking for something that prints with charact…

    ... before
    ; calculation
    sbc hl,de ; the difference between the start ...
    ; in HL
    ex de,hl ; store the offset in DE

    ld hl,strms ; store ...
    chev chev May 2011 Sinclair Basic
  • Proportional Print Routine...Hi Folks, Does anyone know of a good proportional printing routine for the ZX Spectrum? Ideally I am looking for something that prints with charact…

    ... hl, hl
    add hl, hl
    add hl, hl
    add hl, de
    add hl, de
    add hl, de ...
    ex de, hl ...
    Dr BEEP Dr BEEP May 2011 Sinclair Basic
  • New game! Nanako in CJMC for ZX81!Yup, that's true. We've been busy in crafting a nice, small, simple library to code games in text mode (this is, standard, unexpanded) for the 16K ZX…

    ... begin: ld hl,screen
    ld (16388),hl
    ; ... /> ld de,20
    add hl,de
    ld (hl),255
    ld hl,(16388) ;hires file ( ...
    low: add hl,de ;next hires line
    Dr BEEP Dr BEEP May 2011 Brand new software
  • Back to BASIC[U][B]Archaeology guide to programs compiled used MCODERII.d[/B][/U] After various people have been talking about "Frank'n'stein" I decided to finis…

    ... 209
    EX DE, HL ; 28083 235
    LD (HL), E ; 28084 115 ... 209
    EX DE, HL ; 28093 235
    LD (HL), E ; 28094 ... 209
    EX DE, HL ; 28103 235
    LD (HL), E ; 28104 ... ; 28176 167
    L_6E11: SBC HL, DE ; 28177 237 82
    JP ...
    Jimmy Jimmy May 2011 Development
  • Back to BASIC[U][B]Archaeology guide to programs compiled used MCODERII.d[/B][/U] After various people have been talking about "Frank'n'stein" I decided to finis…

    ... A ; 29833 167
    SBC HL, DE ; 29834 237 82
    JP ... A ; 29847 167
    SBC HL, DE ; 29848 237 82
    JP ... 0
    POP DE ; 29902 209
    ADD HL, DE ; 29903 25
    EX DE, HL ; 29919 235
    SBC HL, DE ; 29920 237 82 ...
    Jimmy Jimmy May 2011 Development
  • Print TextHow do i print text on the bottom left row(memory location in attribute 23295) of the screen in assembly? I understand the parts better on paper and …

    ... found
    push hl
    push de
    push de
    ;save off ... hl,hl
    add hl,hl
    ;multiply ASCII value by 8
    ld de ... ,15360
    add hl,de
    ;add it ...
    pmess_loop1 ld a,(hl)
    ld (de),a
    inc l ...
    Turkwel Turkwel June 2011 Development
  • Print TextHow do i print text on the bottom left row(memory location in attribute 23295) of the screen in assembly? I understand the parts better on paper and …

    ... found
    push hl
    push de
    push de
    ;save off ... hl,hl
    add hl,hl
    ;multiply ASCII value by 8
    ld de ... ,15360
    add hl,de
    ;add it ... zero found
    push hl
    push de
    ;save off registers ...
    ub880d ub880d June 2011 Development
  • GUI/OS for the Spectrum?Hi, Is anybody working on a WIMP/GUI system for the Spec? Is there anything current out there? [url]http://snakeoillabs.com/wordpress/2005/10/30/8…

    ... calculation
    sbc hl, de ; the difference between ... hl, hl ; multiply by 4
    add hl, de ; multiply by 6
    ld de ... to FONT
    add hl, de ; HL holds address of first ... hl, de ; add the offset
    ex de, hl ; put the result back in DE ...
    chev chev June 2011 Development
  • Print TextHow do i print text on the bottom left row(memory location in attribute 23295) of the screen in assembly? I understand the parts better on paper and …

    ... call decode_number1
    ld de,1000
    call decode_number1 ...
    ld de,100
    call decode_number1 ... /> sbc hl,de
    jr nc,decode_number2
    add hl,de
    Turkwel Turkwel June 2011 Development
  • Print TextHow do i print text on the bottom left row(memory location in attribute 23295) of the screen in assembly? I understand the parts better on paper and …

    ... HL,HL
    ADD HL,HL
    ADD HL,HL
    LD DE,$3C00
    ADD HL,DE
    LD DE,(PRTPOS ...
    rich_chandler rich_chandler June 2011 Development
  • Move objectHi again, I am using paper colors to represent game objects. I have a "paddle" that is 4 pixels wide. I save its position as a 2 byte word in memory…

    ... /> ld hl, de ; HL = DE
    inc de ; DE = HL + 1
    ldi ; (DE) = (HL), DE ++, HL ++, BC --
    ldi ; (DE) = (HL), DE ++, HL ++, BC ...
    na_th_an na_th_an June 2011 Development
<1…14151617181920…34>

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