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<1234567…34>
  • Remainder (Mod) calculationsI've been figuring out how to calculate remainders after integer division by a constant divisor k (A mod k = A % k). I found that for most small di…

    ... c, a
    rrca
    rrca
    rrca
    rrca
    add a ... and store the first shift in a register to ... one. This saves one shift and one byte for ... a
    rlca ; left rotation
    rlca
    rlca< ...
    Magne Magne October 2021 Assembler
  • 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?

    ... B]R[/B] for [I]rotation[/I], [B]S[/B] for ... [B]C[/B] if the rotation is [I]circular[/I] ( ... if it a "normal" rotation, where the carry flag act ... ] for [I]logical[/I]. Arithmetic shifts can be used to ... bit (0), and the arithmetic shift would do exactly the same ...
    Metalbrain Metalbrain October 2011 Development
  • 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 right circular.
    RRCA Rotate right circular accumulator.< ... SLA m Shift operand m left arithmetic.
    SRA m Shift operand ... m right arithmetic.
    SRL m Shift operand ...
    Ralf Ralf October 2011 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…

    [code]; --- THE ARITHMETIC ROUTINES -------------------------------------------------

    ; THE 'E- ... :
    rlca ; copy bit
    rrca ; 7 to carry
    jr ... register set
    call shift_fp ; shift bits

    org 0x2edf ...
    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…

    ... set
    sra l ; shift right arithmetic L'
    rr d ; ... sign byte and carry
    rrca ; rotate
    adc a ... stack
    call shift_fp ; shift addend right
    pop ...
    rra ; test for shift
    jr nc, test_neg ; ...
    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 ... /> org 0x22f0
    plot_loop:
    rrca ; shift right
    djnz plot_loop ; loop ... ; of character
    defw pos_5 ; rotation and start
    defw pos_6 ...
    chev chev October 2013 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…

    ... carry
    rr d ; shift mask
    rr e ; ... /> jr nz,pch_shift ; shift on
    pch_sh_done:

    Video memory arithmetic:

    [code]
    ... . again
    rrca
    rrca
    rrca
    and #0x18 ...
    tstih tstih August 2015 Development
  • Wanted Software to Swap for Rom Carts ;)Wot I have for grabs is 4 Complete ROM Carts which I will swap for my wants below Horace [url="http://www.cornishdavey.dsl.pipex.com/4.jpg"]http://w…

    ... /> Nuke Lear
    Polaris
    Shift Shaft
    Staff of Zaranol ... /> Introduction to Trigonometry
    Mental Arithmetic
    Tablesums
    Theorem of ...
    Cornishdavey:)) Cornishdavey:)) February 2004 Wanted
  • Red Shift updatedHere are some of the additions to Red Shift over the last week or so. * 8 Spectrum game reviews have been put up, including that of two type-ins (is…

    ... of the additions to Red Shift over the last week or ... direction and content for Red Shift.

    DISCLAIMER: The term ... 'Red Shift' has no relation/bearing/affiliation ...
    Arjun Arjun April 2004 Announcements
  • Arcanoid - Red Shift re-incarnatedI hadn't updated my web site Red Shift for three months now and I decided that the time has come for just that. To begin with, I've changed the loo…

    ... updated my web site Red Shift for three months now and ... been re-named from "Red Shift" to "Arcanoid". I hope to ...
    Arjun Arjun August 2004 Announcements
  • Smooth Screen Scrolling RoutineHi everyone, this is a follow up to the thread on smooth screen scrolling. As promised here is the code for the routine. It's pretty long and fairl…

    ... A,B
    AND 3 ;SHIFT POSITION 0-3
    JR ... />
    RDISPB LD BC,0 ;ROTATION DISPLACEMENT
    ADD HL,BC ...
    dmsmith dmsmith September 2004 Development
  • Night ShiftAnyone interested in selling their original boxed copy of Night Shift, complete with all the original booklets? I would certainly be interested. Cor…

    Anyone interested in selling their original boxed copy of Night Shift, complete with all the original booklets? I would certainly be interested.

    Cordially,

    Jamie
    jamieangus jamieangus October 2005 Wanted
  • Hawl, we're on the Night ShiftIs it just me, or is it impossible for Night Shift (LucusFilm Games) to load on a 128k machine? My original copy doesn't work and even trying the TZ…

    ... is it impossible for Night Shift (LucusFilm Games) to load on ...
    redballoon redballoon March 2006 Games
  • 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…

    ... bit 0-2
    rlca ; shift
    rlca ; five
    rlca ... of font
    rrca ; shift right
    rrca ; four bits
    rrca ; leaving 7 ... byte of font
    rlca ; shift left
    rlca ; four bits ...
    chev chev January 2007 Development
  • RrcaI'm having trouble finding an exact explanation to how all the z80 instructions work, but I get by ok on most of them. I'm sure I've been given link…

    ... stuck with right now is RRCA

    Exactly what does ...
    mulder mulder October 2007 Development
  • Xor-shift random number generator for Z80[QUOTE=Patrik Rak;320244]Come on, people, [URL="http://www.jstatsoft.org/v08/i14/paper"]xor-shift generators[/URL] devised by Marsaglia, that's the w…

    ... .org/v08/i14/paper"]xor-shift generators[/URL] devised by Marsaglia ...
    Patrik Rak Patrik Rak December 2008 Development
  • Murkwood / Red ShiftI have a tape (no inlay) called "Murkwood" by "Red Shift" 1984 I can't find it listed anywhere, and I wonder if it is an expansion pack for a game a…

    ... inlay) called "Murkwood" by "Red Shift" 1984

    I can ...
    exobuzz exobuzz January 2009 MIA/STP/SDP
  • Delete keyIs it the case that this: [CODE]ld bc, 0xEEFE in a, (c) rrca jp nc, delete_key_pressed[/CODE] will jump if Caps-shift is pressed [B]or[/B] i…

    ... /> rrca
    jp nc, delete_key_pressed[/CODE]
    will jump if Caps-shift ...
    in a, (c)
    rrca
    ret c
    ld ...
    in a, (c)
    rrca
    ret c[/CODE]
    ajmoss ajmoss May 2010 Development
  • Z80 RRCA instruction...Hi Folks, Well my exploration of Z80 MCODE continues apace! I am struggling to understand how the RRCA instruction works. The official Zilog manua…

    ... struggling to understand how the RRCA instruction works. The official Zilog ... 1 0

    Execute RRCA and you get:

    Paddy Coleman Paddy Coleman August 2010 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…

    ... and %111
    rrca
    rrca
    rrca
    or l


    populatecoords ; sets shift amount, and actual coordinate for ... /> scratchspace ; used to shift character before printing to screen ...
    uglifruit uglifruit August 2012 Development
  • CAPS SHIFT on Spectrum+ ComputerI have just recently supplied a couple of replacement Spectrum+ keyboard membranes to a customer in Barby, Germany. Although something may have been…

    ... , the customer cannot get CAPS SHIFT n or m to give ... /> He has tried both CAPS SHIFT buttons.

    I am ... other letters work with CAPS SHIFT - he has tried both membranes ... keys work fine with CAPS SHIFT.

    Does anyone have ...
    rwap rwap December 2012 Hardware
  • Rally Shift Extreme kickstarterMy brother who started programming for the Spectrum now has a kickstarter for a rally game: [url]http://www.kickstarter.com/projects/694378857/rally-…

    ... .kickstarter.com/projects/694378857/rally-shift-extreme-racing-game-inspired-by ...
    MinerWilly MinerWilly April 2013 Chit chat
  • CAPS-SHIFT KeyCodeIs there a standard Keycode for CAPS-SHIFT Key ? Looking at the ROM documentation in the Main key table KEYTABLE_A, there is no Entry for CAPS_SHI…

    ... a standard Keycode for CAPS-SHIFT Key ?

    Looking ... .

    NOTES:
    SYMBOL-SHIFT is mapped to control code ... A - Character set", so CAPS-SHIFT could be assigned 15 = 0x0F ... a defacto standard for CAPS-SHIFT keycode ?

    P. ...
    RMartins RMartins October 2016 Development
  • A sped up pixel-shift routine for 1-byte–wide spritesHere’s an optimized (for speed) real-time sprite shifting routine for sprites that are one byte wide. It uses no memory variables for storage of inte…

    ... ,a ;no? Make B our shift counter
    ex af,af ...
    msl_shift
    rr c ;shift through Carry
    rra
    Ast_A_Moore Ast_A_Moore February 2017 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
  • ZEsarUX 9.2 Release CandidateHi! I have uploaded a new ZEsarUX Release Candidate version 9.2. The final stable version will come in a few weeks, so stay tuned! You can down…

    ... Test Style
    -Added key Shift+Cursor Right to switch to ... coordinates, detecting unified/composite, mirror, rotation
    -Fixed 4bp sprites: pattern ...
    chernandezba chernandezba March 2021 Emulators
  • ZEsarUX v9.2 Final released - Version 9.2 - Cliff Hanger edition. 05 April 2021As seen on: https://github.com/chernandezba/zesarux/releases [quote] ZEsarUX-9.2 @chernandezba chernandezba released this 21 hours ago · 6 com…

    ... Test Style
    -Added key Shift+Cursor Right to switch to ... coordinates, detecting unified/composite, mirror, rotation
    -Fixed 4bpp sprites: pattern ...
    Luzie Luzie April 2021 Emulators
  • Sharopolis's QuizHere you are folks, My quiz, edutainment at its best. This is the first quiz I've compiled so sorry if its too easy or hard or whatever. Some of the…

    ... for the question on "crop rotation in the fifteenth century".
    Shift? (1 point)

    Got ...
    Ed Ed July 2002 Games
  • Horizontal scrollDoes anyone know how to do a 2 or 4 pixel left or right horizontal scroll of the spectrum screen. I can make a 1 one pixel scroll with: ... rl (hl…

    ... location POP HL, you can shift (well left at least) with ... previous carry from the last rotation to determine the rightmost bit ...
    cyborg cyborg March 2003 Sinclair Miscellaneous
<1234567…34>

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Related Threads

  • problem with symbol shift and caps shift key combinations on multilayer keyboard membranesHello,<br /> <br /> I know, it is generally know that some ZX Spectrums with multilayer keyboard membranes have problems with some key combinations…
  • Ok Dokey, ive got 700+ Dupes to shift ;) Swapsie??I will sell the below, but id rather swap for missing tapes i dont have on a 1:1 basis. if you would like to swap send a list of your dupes to me at …
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  • Red Shift updatedHere are some of the additions to Red Shift over the last week or so.<br /> <br /> * 8 Spectrum game reviews have been put up, including that of two …
  • Arcanoid - Red Shift re-incarnatedI hadn't updated my web site Red Shift for three months now and I decided that the time has come for just that. <br /> <br /> To begin with, I've cha…
  • Night ShiftAnyone interested in selling their original boxed copy of Night Shift, complete with all the original booklets? I would certainly be interested.<br /…
  • Hawl, we're on the Night ShiftIs it just me, or is it impossible for Night Shift (LucusFilm Games) to load on a 128k machine?<br /> <br /> My original copy doesn't work and even t…
  • When i press shift and 3 i get # instead of ? whats wrongwell it aint me but my bro has rung me to say his Microsoft Word has just started doing what the post title says, i have never used Word, but i have …
  • RrcaI'm having trouble finding an exact explanation to how all the z80 instructions work, but I get by ok on most of them. I'm sure I've been given link…
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