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<1234567…34>
  • Mode 2 Tile Editor SourceA Timex Mode 2 Tile Editor incorporating a byte mirror table. The compiled version is available in the CSSCGC 2008 collection from the WoS archive. …

    ... the
    call cp1k ; alternate register
    call cp1k ; set ...
    cp1kc: ; the alternate register
    call cp1kd ; set ... of the
    cp16bytes_b: ; alternate register
    call cp2bytes ; set ... /> ld (hl),a ; register to four screen rows
    chev chev January 2007 Development
  • Z80 vs. 8080.[QUOTE=obo]... because 8080 is pretty much just a cut down Z80.[/QUOTE] Really? So what's been cut, and why? Hang on, didn't the 808 evolve from the…

    ... /> [/quote]

    ... and the alternate register set the z80 has but ...
    Alcoholics Anonymous Alcoholics Anonymous June 2006 Hardware
  • Z80 vs. 8080.[QUOTE=obo]... because 8080 is pretty much just a cut down Z80.[/QUOTE] Really? So what's been cut, and why? Hang on, didn't the 808 evolve from the…

    ... .

    [QUOTE]... and the alternate register set the z80 has but ...
    obo obo June 2006 Hardware
  • Spectrum NOT DEAD PROJECT SPECTRUM XXICommodore is back! MSX is back! Amiga is back! And Spectrum?? Why Not Dont Cry with Nostalgie for Spectrum! Help us To do this dream true! The SPECTR…

    ... on the Z80 is the alternate register set paged in by the ...
    Matt_B Matt_B February 2007 Hardware
  • VIC 20 emulation on the SpectrumI'm sure most people are aware of the my attempt at bringing the full Commodore experience to Sinclair users with the "Twenty Commodes" program. It e…

    ... . I am not using the alternate register set much in my core ...
    Jimmy Jimmy August 2008 Sinclair Miscellaneous
  • VIC 20 emulation on the SpectrumI'm sure most people are aware of the my attempt at bringing the full Commodore experience to Sinclair users with the "Twenty Commodes" program. It e…

    ... . I am not using the alternate register set much in my core ...
    Dr BEEP Dr BEEP September 2008 Sinclair Miscellaneous
  • Z80 'EXX' ConfusionI was working on a little Z80 routine last evening, and, having run out of registers, resorted to sticking one of the values into a memory location a…

    ... BASIC is presumably using the alternate register bank, hence the following works ...
    RoseCotton RoseCotton November 2009 Development
  • Sprite RotatingI was looking (actually at Everyone's a Wally), and noticed that all the graphics for the main characters are left facing, and two characters wide. …

    ... IX or IY Registers, No Alternate Register set, No Block instructions and ...
    Turkwel Turkwel June 2010 Development
  • New WIP underway - 'Dingo'.Hi, Prepare for a long post. Perhaps I can even challenge ewgf here. :razz: Anyway, I've been meaning to get into Z80 programming and making a game…

    ... to flip them into the alternate register set. Then set up your ...
    jonathan jonathan August 2011 Development
  • Creating a new game - AssemblySo... finally I?m studying Assembly Z80... after 36 years. :) Well... it?s sooooooooooooo hard to make a game using Assembly? I bought a book (Spectr…

    ... registers and which is the 'alternate' set. You don't have ... to make sure that the alternate register HL' contains $2758 before you ...
    gasman gasman January 2012 Development
  • Creating a new game - AssemblySo... finally I?m studying Assembly Z80... after 36 years. :) Well... it?s sooooooooooooo hard to make a game using Assembly? I bought a book (Spectr…

    ... to make sure that the alternate register HL' contains $2758 before you ...
    R-Tape R-Tape January 2012 Development
  • Creating a new game - AssemblySo... finally I?m studying Assembly Z80... after 36 years. :) Well... it?s sooooooooooooo hard to make a game using Assembly? I bought a book (Spectr…

    ... to make sure that the alternate register HL' contains $2758 before you ...
    polomint polomint January 2012 Development
  • In Java for ZXHi All I am glad to notify you that I have opened the sources of my J2Z80 translator (0.1 version) which allows to use Java toolchain to generate Z8…

    ... br />
    Register usage
    ---------------
    The alternate register set can be ... system libraries. The main register set (HL,BC,DE) ... . The IX register is the index register for a call ... br /> --------------
    The return register pair is BC. If a ...
    Raydac Raydac June 2012 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 …

    ... the attribute value in the alternate register set later)

    [B ...
    R-Tape R-Tape June 2012 Development
  • What Spectrum projects (Software/Games/Utility)(Hardware)(Others) are you working on?So, basically that :) You dont have to give names or more clues if you dont want to ;) Also, if you are working on more than one, you can tell all of…

    ... forget that there's an alternate register set. It doesn't cost ... to use them for an alternate block pattern for some ... I]Crimson Skies[/I]). An alternate approach would be a raycasting ... ideas like limited speed boosts, alternate weapons, damage/weight and speed ...
    joefish joefish October 2012 Development
  • What Spectrum projects (Software/Games/Utility)(Hardware)(Others) are you working on?So, basically that :) You dont have to give names or more clues if you dont want to ;) Also, if you are working on more than one, you can tell all of…

    ... forget that there's an alternate register set. It doesn't cost ... to use them for an alternate block pattern for some of ...
    R-Tape R-Tape October 2012 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…

    ... it
    call fp_to_a ; get register byte
    cp 17 ; check ... range
    ld bc, ay_reg ; register port
    out (c), a ...
    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…

    ... exit calculator
    exx ; alternate register set
    push hl ; ... d ; bytes ...
    exx ; alternate register set
    rl e ; ... ... exit calculator
    exx ; alternate register set
    pop hl ; unstack ...
    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…

    ... br /> one_shift:
    exx ; alternate register set
    sra l ; shift ... ; set sign
    exx ; alternate register set
    inc hl ; point ... return if zero
    exx ; alternate register set
    push hl ; stack ...
    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…

    ... if already zero
    exx ; alternate register set
    push hl ; ... from calculator stack
    exx ; alternate register set
    push hl ; stack ... ; mantissa of result ...
    exx ; alternate register set
    ld e, c ...
    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…

    ... offset to A
    exx ; alternate register set
    jr scan_ent ; immediate ... test for space
    exx ; alternate register set
    push hl ; ... literal pointers
    exx ; alternate register set
    pop hl ; ...
    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…

    ...
    x80_fdjnz:
    exx ; alternate register set
    push hl ; stack ...
    x80_fjp:
    exx ; alternate register set

    org 0x36ce ... drop return address
    exx ; alternate register set
    ex (sp), hl ...
    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…

    ... result in C
    exx ; alternate register set
    pop bc ; diagonal ... de ; stack step
    exx ; alternate register set
    pop bc ; horizontal ... ; plot step
    exx ; main register set
    ld a, c ...
    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…

    ... ; wipe bytes
    exx ; alternate register set
    ld (udg), bc ... br /> input_ad:
    exx ; alternate register set
    push hl ; ... br /> print_a_2:
    exx ; alternate register set
    push hl ; stack ...
    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…

    ... space as cursor
    exx ; alternate register set
    ld hl, p_flag ... p-flag
    exx ; main register set
    ret ; end of ...
    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…

    ... call_jump ; call address
    exx ; alternate register set
    ld hl, 0x2758 ... of HL'
    exx ; main register set
    ret ; return
    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…

    ... detokenizer_5 ; do detokenization
    exx ; alternate register set
    pop de ; unstack ...
    chev chev November 2013 Development
  • Using the stack to blit bufferI was using a ldir to blit my back buffer to the screen RAM, and it was working pretty well if not rather slow. After reading about using the stack …

    ... ] doesn't exchange AF register pair with its alternate version. It is ... swapped as they have no alternate register.
    joefish joefish February 2014 Development
<1234567…34>

Latest Posts

  • I am currently watching.....
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    John Elliott on April 21
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