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Search Again :: Adv Search 1000 results in 0.022s
<1234567…34>
  • Fastest way to mirror a byte?I.E. turning 01100000 into 00000110, in assembly. I'm trying but I suck at stuff with rotation and the carry bit. Any pointers?

    ... m Rotate operand m right circular.
    RRCA Rotate right circular accumulator.
    RRD Rotate digit right and ... m Shift operand m right arithmetic.
    SRL m Shift operand m right logical ...
    Ralf Ralf October 2011 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…

    ... ;994207"]WHY does RRCA do an 8-bit rotate whereas RRA does ...

    RRCA is Rotate Accumulator Right Circular i.e. Rotate Accumulator contents right one bit ... is Rotate Accumulator Right Through Carry i.e. Rotate Accumulator contents right one bit ...
    dbolli dbolli July 2022 Development
  • Textured Scanline Flood Fill for ZX Spectrum 48KPity that it's quite hard to contribute code to WoS in a straightforward manner. Recently, I have created a textured/hatched fill M/C routine for the…

    Pity that it's quite hard to contribute code to WoS in a straightforward manner. Recently, I have created a textured/hatched fill M/C routine for the ZX Spectrum 48K. It was for a text/graphic adventure I'm working on. The algorithm is based on [url="http ...
    Volker Volker February 2021 Software
  • Character scrollingOk, first I'd like to say that I'm not looking for a complete routine (but that might help) because I am hoping to write it myself and learn a bit mo…

    ... of every byte value rolled right 1 to 7 times, starting ... /> To get a value shifted right x pixels, use tbl_roll + 256 ... a, c
    .doroll
    rrca ; rotate a
    djnz .doroll ; roll ... and build 14 tables of shift right/left instead of rolls, but ...
    Paradigm Shifter Paradigm Shifter February 2010 Development
  • Hi Res Print Routine neededHas anyone seen code for a print routine with pixel accuracy? That is print(y,x,CHAR) that allows 0 < y < 192 and 0 < x < 255 - that takes a charact…

    ... ;450659]I had made the right assumptions then. Sadly, my ... It drew data to the right place, but sorta gibberish.[/QUOTE ...
    ;Rotate the Character Data Byte D times - and Shift the Mask ...
    and 7
    rrca
    rrca
    rrca
    ld e,a ...
    Turkwel Turkwel June 2010 Development
  • SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…

    ... ; store L
    srl l ; shift right logical
    srl l ; to ... ; discard unwanted bits
    rrca ; rotate
    rrca ; into
    rrca ; place
    or ...
    chev chev October 2013 Development
  • SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…

    ... /> sra l ; shift right arithmetic L'
    rr d ; rotate right
    rr e ... ; rotate right
    rr e ; with carry DE
    djnz one_shift ; shift all ... sign byte and carry
    rrca ; rotate
    adc a, 0 ; non ...
    chev chev October 2013 Development
  • SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…

    ... ; error if so
    rrca ; rotate
    rrca ; into position
    jr ... clear carry flag
    rra ; shift right and clear bit 7
    org 0x22f0
    plot_loop:
    rrca ; shift right
    djnz plot_loop ; loop until ...
    chev chev October 2013 Development
  • 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…

    ... engine has to rotate the sprite right by 0-7 ... coordinate. If you need to shift right 3 pixels, eg, you ...
    [code]
    ; h = shift table
    ; de = sprite def ... ) ; or spr graph rotated right
    ld (SP1V_PIXELBUFFER+0), ...
    Alcoholics Anonymous Alcoholics Anonymous April 2016 Development
  • A Neat Redefine Keys RoutinePreviously, I’ve only shared this routine with a couple of people via PM, but I’ve now decided to make it public. I optimized it for size, so it uses…

    ... ;add 1 to A to shift it into the 1–8 ... row counter
    srl c ;shift C 3 times (divide by ... to read (%11111110)
    1$ rrca ;rotate B times
    djnz 1 ... A
    2$ rra ;rotate A right while placing bit 0 into ...
    Ast_A_Moore Ast_A_Moore October 2017 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…

    RRC = rotate right circular, treats the register bits as a circle
    RRA = rotate right arithmetic ... arithmetic operation

    IIRC, RRCA and RLCA were the old ...
    AndyC AndyC July 2022 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…

    ... jr nc,r_on_r ; right char on right col
    jr ... l_on_r ; left char on right col

    ; ... done

    ; right nibble on right hand side

    rrca ; shift right
    rrca ; four bits
    rrca ; leaving ...
    chev chev January 2007 Development
  • ANN: SP1 for Z88DK (aka splib3, Sprite Pack v3.0)Well it's finally arrived, after a month of "a few days from now" release deadlines. SP1 is the lastest version of splib, a flicker-free software sp…

    ... engine to rotate attributes right when the sprite is shifted right by 4 ... the sprite depending on horizontal shift in order to tackle colour ... move cursors up, down, left, right, AT, TAB, relative AT, nested ...
    Alcoholics Anonymous Alcoholics Anonymous December 2006 Development
  • Please test my Manic Miner remake!Thanks to everyone who downloaded my sneak preview of Manic Miner Turbo. Thanks especially to na_th_an who is the only person so far to give feedback…

    ... .5K shift right & left table for that (or a 1.75K rotate ...
    Paradigm Shifter Paradigm Shifter February 2010 Games
  • Hi Res Print Routine neededHas anyone seen code for a print routine with pixel accuracy? That is print(y,x,CHAR) that allows 0 < y < 192 and 0 < x < 255 - that takes a charact…

    ... 's no need to shift anything
    p_print2: rrca
    srl e ...
    ;Rotate the Character Data Byte D times - and Shift the Mask ...
    and 7
    rrca
    rrca
    rrca
    ld e,a ...
    Turkwel Turkwel June 2010 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…

    ... [COLOR="Red"]; left nibble on right hand side[/COLOR] may be ... [COLOR="Blue"]; right nibble on left hand side ... /> [COLOR="#ff0000"] rrca ; shift right
    rrca ; four bits
    rrca ; leaving 7-4 ... use later, and swap RRCA by RLCA look better, ...
    Z80user Z80user November 2010 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…

    ... jr nc, r_on_r ; right char on right col
    jr ...

    ; right nibble on right hand side

    rrca ; shift right
    rrca ; four bits
    rrca ; leaving ... at destination
    rlca ; shift left
    rlca ; ...
    chev chev 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…

    ... ' , SLL and SRL, insted of rotate, shift set 0 bits while moving ...
    chev chev March 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…

    ... jr nc, r_on_r ; right char on right col
    jr ...

    ; right nibble on right hand side

    rrca ; shift right
    rrca ; four bits
    rrca ; leaving ... at destination
    rlca ; shift left
    rlca ; ...
    chev chev June 2011 Development
  • IN or INKEY ?just curious which is better to use.. I have a menu done.. and use 6/7 to go up down it + space to cycle thru the options (using inkey).. obv. if I w…

    ... over" lines can be moved right to the end, dispensing with ... , RRC, SLA, SRL (the rotate & shift Carry variants aren't useful ... a CPIR to find the right one (or two, in some ...
    Battle Bunny Battle Bunny October 2011 Sinclair Basic
  • 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…

    ... ; get bottom 3 bits (shift right)
    ;; at this point ... carry
    rr d ; shift mask
    rr e ; and ... br /> jr nz,pch_shift ; shift on
    pch_sh_done:
    ... acc. again
    rrca
    rrca
    rrca
    and #0x18 ; ...
    tstih tstih August 2015 Development
  • I don't think I'm getting the $22AA Pixel-Add rom routineDear all, I'm misunderstanding how the PIXEL-ADD rom routine works. My code... [code]ld b,175 ld c,1 call $22AA ld (hl),a ret[/code] So…

    ... , the bytes run left-to-right as you would expect, however ... in each byte are displayed right-to-left, i.e. bit ... a byte run right-to-left) and rotate it right "X % 8" times ... . This is what the RRCA: DJNZ ...
    Hikaru Hikaru March 2016 Development
  • Mastering flagsI'm little lost when different flags are set/reset after logic operations, and what conditions must be met. For example, [code] ld a, MODE…

    ... I call the 2-byte rotate/shift instructions that take 8 and ... isn't RLA/RRA/RLCA/RRCA (notice that these also have ...
    Hikaru Hikaru September 2016 Development
  • SpecEmu 2.2Just downloaded this emulator. Seems very nice. I like simplicity of user interface - I don't need toolbar and icons. Debugger is also good. The abil…

    ... /> 3. left Shift for Caps Shift, right Ctrl for Symbol Shift, and I can ... change this! I prefer right Shift for Symbol Shift.

    Anyway, thanks ...
    kmatveev kmatveev June 2004 Emulators
<1234567…34>

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HitBox

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