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Search Again :: Adv Search 1000 results in 0.007s
<1…11121314151617…34>
  • Thought this would be simple... Z80Hi Folks, Started to read "Beyond simple BASIC, Delving Deeper into your ZX Spectrum" by Dilwyn Jones. This is a great book and I came across the…

    ... the X,Y equal to zero option.


    [ ... a ; Sets Z flag if A is zero
    jp z,MAIN_LOOP ... /> xor a ; Set A to zero
    ATTR_ROW_CHAR ld (hl),$09 ...
    Paddy Coleman Paddy Coleman September 2017 Development
  • Thought this would be simple... Z80Hi Folks, Started to read "Beyond simple BASIC, Delving Deeper into your ZX Spectrum" by Dilwyn Jones. This is a great book and I came across the…

    ... rows
    ; If Y is zero we can jump straight to ... a ; Sets Z flag is A is zero
    jp z,PAINT_POLYGON ...
    Paddy Coleman Paddy Coleman September 2017 Development
  • Print vs 23659To be honest I could not think of a better topic title, although its not ideal. Anyway, I do recall reading ages ago that the reason you cannot no…

    ... an error message in exactly zero lines (the system variable at ... it checks if the carry flag is set, and if it ... from it will result in zero and [i]no carry[/ ... with result in the carry flag being set and a jump ... of range[/b]” in zero lines the Spectrum crashes.
    Ast_A_Moore Ast_A_Moore October 2017 Sinclair Basic
  • What was on your first pirate tapeOf course, we all started with Horizons and then bought our first couple of games (in my case, Bugaboo The Flea - which I still haven't managed to co…

    ... 7, Meteor, Intrigue, 3D word, Flag
    SPECTRUM 4 - Pool, Scuba ... , Falcon patrol 2, Transformers, Chequered flag
    ZX GAMES 22 - A ... raid, 1985, Chinese patience, Ground zero, Chuckman, Eights, Devils of the ...
    mel the bell mel the bell March 2018 Games
  • Proportional-width fontsFor reasons that are still not quite clear to me (because I’ve always loved typography and design,) I never bothered to write a proportional-font rou…

    ... /> jr z,char_no_shift ;is it zero (Z flag check only)? okay, no ...
    Ast_A_Moore Ast_A_Moore March 2018 Development
  • TAB - Text Adventure BuilderOk. I wasn't exactly sure which forum to post this, so mods feel free to move to relevant section.. Remember all those old text adventures written w…

    ... room 52 and flag 1 holds a value of zero.#else#room ...
    catventure catventure April 2018 Games
  • Maze Death Rally-XJust released a demo of my new game which I'm developing for this years ZXDev MIA & Remakes compo. The game is a remake of the classic Spectrum & ZX8…

    ... bug were with zero fuel getting the L flag causes screen corruption ... same time as collecting a flag sometimes they are not erased ...
    TomD TomD November 2018 Brand new software
  • Proportional-width fontsFor reasons that are still not quite clear to me (because I’ve always loved typography and design,) I never bothered to write a proportional-font rou…

    ... /> jr z,char_no_shift ;is it zero (Z flag check only)? okay, no ...
    Ast_A_Moore Ast_A_Moore December 2018 Development
  • Loading Schemes > 1-bit per 2 edgesHi Guys, I'm just having another look at loading schemes again (a subject that interests me). Does anyone know if there any loading schemes t…

    ... one. Otherwise, it’s a zero.

    I guess the ... simpler to reuse the carry flag. The CP B instruction compares ... , RL L, puts the carry flag into the lowest bit of ...
    Ast_A_Moore Ast_A_Moore August 2019 Games
  • Loading Schemes > 1-bit per 2 edgesHi Guys, I'm just having another look at loading schemes again (a subject that interests me). Does anyone know if there any loading schemes t…

    ... one. Otherwise, it’s a zero.
    [/quote]
    Sorry, I ... simpler to reuse the carry flag. The CP B instruction compares ... , RL L, puts the carry flag into the lowest bit of ...
    BloodBaz BloodBaz August 2019 Games
  • Understanding tape edgesI've never done any tape reading code. But I've read about these "edges" on multiple occasions. Trouble is I don't understand what they heck they are…

    ... port and the counter reaches zero, you leave the loop with ... , you count it as a zero. After you’ve read eight ... constant, you get the carry flag set (for ones) or reset ... shifts by setting the carry flag.)

    Thus, the maximum ...
    Ast_A_Moore Ast_A_Moore March 2020 Development
  • Who's NEXT?How about having a category just for Spectrum NEXT owners? I got mine on Monday, its the original issue, plain jane and quite enough for me to ge…

    ... the asterisk as wildcard matching zero or more characters in the ... dot commands may need a flag like -h or --help as ...
    Alcoholics Anonymous Alcoholics Anonymous September 2021 Sinclair Miscellaneous
  • 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…

    ... h ; A = H + carry flag
    ld h, a ; ... ;
    sprite8x8caCalcNextRow:
    ; zero A
    xor a
    flag
    ld h, a ; ... ;
    sprite8x8caAlwaysLookupRow:
    ; zero A
    xor a
    flag
    ld h, a ; ...
    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…

    ... h ; A = H + carry flag
    ld h, a ; write ... h ; A = H + carry flag
    ld h, a ; write ... /> ;
    sprite8x8caAlwaysLookupRow:
    ; zero A
    xor a
    flag
    ld h, a ; write ... h ; A = H + carry flag
    ld h, a ; ...
    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…

    ... column
    ;
    sprite8x8a:
    ; zero A
    xor a
    adc h ; A = H + carry flag
    ld h, a ; write ...
    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…

    ... column
    ;
    sprite8x8a:
    ; zero A
    xor a
    adc h ; A = H + carry flag
    ld h, a ; write ...
    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…

    ... /8
    ;
    sprite16x16ca:
    ; zero A
    xor a
    adc h ; A = H + carry flag
    ld h, a ; write ...
    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…

    ... /8
    ;
    sprite16x16a:
    ; zero A
    xor a
    adc h ; A = H + carry flag
    ld h, a ; write ...
    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…

    ... h ; A = H + carry flag
    ld h, a ; write ... /> ;
    sprite8x8aDoubleStride:
    ; zero A
    xor a
    flag
    ld h, a ; write ... h ; A = H + carry flag
    ld h, a ; write ... h ; A = H + carry flag
    ld h, a ; write ...
    Paradigm Shifter Paradigm Shifter July 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…

    ... h ; A = H + carry flag
    ld h, a ; write ... h ; A = H + carry flag
    ld h, a ; write ... /> ;
    sprite8x8caAlwaysLookupRow:
    ; zero A
    xor a
    flag
    ld h, a ; write ... h ; A = H + carry flag
    ld h, a ; ...
    Paradigm Shifter Paradigm Shifter July 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…

    ... /> adc h ; A = H + carry flag
    ld h, a ; write ... column
    ;
    sprite8x8aDoubleStride:
    ; zero A
    xor a
    adc h ; A = H + carry flag
    ld h, a ; write ... detection routines set the carry flag if there was a collision ...
    Paradigm Shifter Paradigm Shifter July 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…

    Ok, I'll shut up now.
    I get that assembly isn't easy, but I don't want to give up on it.

    [code] DEVICE ZXSPECTRUM48 ; Device setting for sjasmplus (.tap writing etc)
    SCREEN EQU $4000 ; Location ...
    Kotek Kotek July 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…

    ... column
    ;
    sprite8x8a:
    ; zero A
    xor a
    adc h ; A = H + carry flag
    ld h, a ; write ...
    Paradigm Shifter Paradigm Shifter July 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…

    ... column
    ;
    sprite8x8a:
    ; zero A
    xor a
    adc h ; A = H + carry flag
    ld h, a ; write ...
    Kotek Kotek July 2022 Development
  • Robospec (new project, hopefully useful as a tutorial as well)Starting a new project after my graphics investigations. * It's gonna be a Robotron clone since that's not too ambitious (although I'd like to hav…

    ... /8
    ;
    sprite16x16ca:
    ; zero A
    xor a
    adc h ; A = H + carry flag
    ld h, a ; write ... onto screen
    sprite16x16caXOR:
    ; zero A
    xor a
    adc h ; A = H + carry flag
    ld h, a ; write ...
    Paradigm Shifter Paradigm Shifter July 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…

    ... h ; A = H + carry flag
    ld h, a ; write ... /> ;
    sprite8x8aDoubleStride:
    ; zero A
    xor a
    flag
    ld h, a ; write ... h ; A = H + carry flag
    ld h, a ; write ... h ; A = H + carry flag
    ld h, a ; write ...
    Paradigm Shifter Paradigm Shifter July 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…

    ... SCF sets carry flag, CCF complements carry flag [it does NOT ... clears carry flag, XOR A sets A to zero and ... clears the carry flag). Obviously if ... to do your carry flag setting stuff AFTER the ... success/fail via carry flag) when I was looking ...
    Paradigm Shifter Paradigm Shifter July 2022 Development
<1…11121314151617…34>

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