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<1…19202122232425…34>
  • ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …

    ...
    ld b,3
    ldir
    ret
    [/CODE]
    Einar Saukas Einar Saukas January 2013 Brand new software
  • RCS (Reverse Computer Screen)[B]RCS[/B] ("Reverse Computer Screen", or simply SCR written backwards) is a small utility I'm about to release, that reorders bytes from the ZX-Spec…

    So how do you use RCS in practice? It's quite simple:
    [LIST]
    [*]First transform a regular ZX-Spectrum screen file (such as "Cobra.scr") into the RCS format (producing "Cobra.scr.rcs") using the command-line utility RCS;


    [*] ...
    Einar Saukas Einar Saukas January 2013 Development
  • RAM used / corrupted by +3DOSAs I said previously, [url=http://www.worldofspectrum.org/forums/showthread.php?t=41775]I'm trying to put some games in hard disk[/url] so they can b…

    ...
    ld (hl),$00
    ldir ; clear DOS workspace variables
    Battle Bunny Battle Bunny January 2013 Games
  • ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …

    ... /> pop de ; DE = destination
    ldir
    exit:
    pop hl ...
    antoniovillena antoniovillena January 2013 Brand new software
  • RAM used / corrupted by +3DOSAs I said previously, [url=http://www.worldofspectrum.org/forums/showthread.php?t=41775]I'm trying to put some games in hard disk[/url] so they can b…

    ...
    LD (HL), $00
    LDIR
    CALL $1F23
    CALL ...
    Battle Bunny Battle Bunny January 2013 Games
  • RCS (Reverse Computer Screen)[B]RCS[/B] ("Reverse Computer Screen", or simply SCR written backwards) is a small utility I'm about to release, that reorders bytes from the ZX-Spec…

    ... content to this buffer using LDIR, then use part of [URL ...
    Einar Saukas Einar Saukas January 2013 Development
  • RCS (Reverse Computer Screen)[B]RCS[/B] ("Reverse Computer Screen", or simply SCR written backwards) is a small utility I'm about to release, that reorders bytes from the ZX-Spec…

    ... content to this buffer using LDIR, then use part of [URL ...
    antoniovillena antoniovillena January 2013 Development
  • RAM used / corrupted by +3DOSAs I said previously, [url=http://www.worldofspectrum.org/forums/showthread.php?t=41775]I'm trying to put some games in hard disk[/url] so they can b…

    ...
    ld bc, 200
    ldir

    LD (24198), SP ...
    ld bc, 200
    ldir

    ld a, 16 ...
    BCH BCH January 2013 Games
  • RCS (Reverse Computer Screen)[B]RCS[/B] ("Reverse Computer Screen", or simply SCR written backwards) is a small utility I'm about to release, that reorders bytes from the ZX-Spec…

    ... /> pop de ; DE = destination
    ldir
    exit: pop hl ; restore ...
    antoniovillena antoniovillena January 2013 Development
  • RCS (Reverse Computer Screen)[B]RCS[/B] ("Reverse Computer Screen", or simply SCR written backwards) is a small utility I'm about to release, that reorders bytes from the ZX-Spec…

    89 bytes (-1 byte):

    C cruncher code:
    [CODE]
    #define MAX_OFFSET 2160 /* range 1..2160 */
    ...
    void write_elias_gamma(int value) {
    int bits= 0, rvalue= 0;
    while ( value>1 )
    ++bits,
    antoniovillena antoniovillena January 2013 Development
  • RCS (Reverse Computer Screen)[B]RCS[/B] ("Reverse Computer Screen", or simply SCR written backwards) is a small utility I'm about to release, that reorders bytes from the ZX-Spec…

    ... -ini
    push de
    ldir
    ret
    IF back ...
    antoniovillena antoniovillena January 2013 Development
  • Converting games to disk: difficult loadersThis thread has an spanish version in foro speccy, but I haven't gathered enough information to overcome my problems. I've been converting some game…

    ... . You should be on a LDIR instruction. This copies data from ... the window down past the LDIR routines and you'll see ...
    FrankT FrankT January 2013 Games
  • Converting games to disk: difficult loadersThis thread has an spanish version in foro speccy, but I haven't gathered enough information to overcome my problems. I've been converting some game…

    ...
    LD BC,40401
    LDIR[/code]
    Set a bp ...
    LD BC,40401
    LDIR
    LD SP,64256
    FrankT FrankT January 2013 Games
  • +3e filebrowserHello everyone, Im writing a game/program loader for the +3e (with an IDE interface, but it can work with floppies too). The program lets you choose…

    ... ,7
    push de
    ldir
    ld a,$84 ;parameter ...
    Battle Bunny Battle Bunny January 2013 Development
  • Red DwarfA Red Dwarf video game - good or bad idea? (given its recent resurgence in popularity in the UK) My ideas: [b]Plots[/b] - An interquel which bridg…

    ... page in the suited page, LDIR 16Kb from $8000 to $C000 ...
    ld bc, 16384
    ldir

    ld A, (#5B5C ...
    na_th_an na_th_an February 2013 New game ideas
  • Bottom 4 lines of the screen fileI'm wanting to save the bottom 4 lines of the display memory (AT 20,0 to #0; AT 1,31) 23168 is the start of the attributes and its length will be 32…

    ... : ld c,l
    ldir
    ld l,$80
    ld c,l
    ldir
    ret[/code]
    ... ld c,e
    ldir
    ld e,$80
    ld c,e
    ldir
    ret[/code]
    ...
    Battle Bunny Battle Bunny February 2013 Development
  • Bottom 4 lines of the screen fileI'm wanting to save the bottom 4 lines of the display memory (AT 20,0 to #0; AT 1,31) 23168 is the start of the attributes and its length will be 32…

    ... /> loops: ld c,l
    ldir
    ld l,$80
    ld c,l
    ldir
    ret[/code]
    [/QUOTE ...
    Morkin Morkin February 2013 Development
  • Bottom 4 lines of the screen fileI'm wanting to save the bottom 4 lines of the display memory (AT 20,0 to #0; AT 1,31) 23168 is the start of the attributes and its length will be 32…

    ...
    LD BC,64
    LDIR
    POP HL
    PUSH ...
    LD BC,63
    LDIR ; Save contents of bottom four ...
    LD BC,64
    LDIR ; Restore the bottom four lines ...
    dbolli dbolli February 2013 Development
  • Bottom 4 lines of the screen fileI'm wanting to save the bottom 4 lines of the display memory (AT 20,0 to #0; AT 1,31) 23168 is the start of the attributes and its length will be 32…

    ... ,c ld e,c
    ldir ldir
    dec a dec a ...
    Battle Bunny Battle Bunny February 2013 Development
  • SpeedLockI'm aware that there are seven (7) - yes, SEVEN!! - different iterations of the SpeedLock loader. I've loaded games from all 7 types, one by one, and…

    ... versions did not do an LDIR or similar to get the ...
    spider spider February 2013 Games
  • maximum addressable RAM for a Z80 using bank switching?What is the maximum addressable RAM for a Z80 using bank switching? The Enterprise64 home computer could address up to 4MB, is this the limit for a …

    ... times 21 T, considering each LDIR executed consumes 21 T) to ...
    TK90XFan TK90XFan February 2013 Hardware
  • maximum addressable RAM for a Z80 using bank switching?What is the maximum addressable RAM for a Z80 using bank switching? The Enterprise64 home computer could address up to 4MB, is this the limit for a …

    ... times 21 T, considering each LDIR executed consumes 21 T) to ...
    1024MAK 1024MAK February 2013 Hardware
  • Screens and BasicA question about the ZX screens. I am using software to convert my own art and drawings to the ZX Spectrum. I have some tools to change .jpg files in…

    ... .php?t=16158&highlight=ldir+6912+16384"]copy block routine ...
    Dr BEEP Dr BEEP February 2013 Sinclair Basic
  • How to test Z80 Code?Hi All, Is there a way to test a block of z80 code (nothing speccy specific in it) with many different inputs? The reason I ask is that I'm writing…

    ... storage, then you can just LDIR the output block to the ...
    Battle Bunny Battle Bunny May 2013 Development
  • Hacking a game MAJIKAZOHello, I am trying to put a recent game called MAJIKAZO on disk. However, the loader is written for tape only, so I have to find a way how to rewrit…

    ...
    halt
    di
    ldir
    ; This code copies the ...
    ld bc,29
    ldir
    jp 65024

    FrankT FrankT May 2013 Development
  • Relocation with SDCCI desperately need auto- relocation with SDCC. Something that will compile all of my code using start address 0 and generate relocation table so that…

    ... block move (the z80 has ldir so this could be a ...
    Alcoholics Anonymous Alcoholics Anonymous June 2013 Development
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