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<1…18192021222324…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 …

    ...
    ex de, hl
    sbc hl, de ; HL = destination - offset - 1
    pop de ; DE = destination ...
    Einar Saukas Einar Saukas January 2013 Brand new software
  • 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 …

    ... inc d ; add 128 to DE
    rr d
    ... hl, de ; HL = destination - offset - 1
    pop de ; DE = destination
    ldir
    pop hl ...
    Einar Saukas Einar Saukas January 2013 Brand new software
  • 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 …

    ... inc d ; add 128 to DE
    rr d
    ... hl, de ; HL = destination - offset - 1
    pop de ; DE = destination
    ldir
    pop hl ...
    antoniovillena antoniovillena January 2013 Brand new software
  • 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 …

    ... inc d ; add 128 to DE
    offset_end:
    rr ... hl, de ; HL = destination - offset - 1
    pop de ; DE = destination
    ldir
    pop hl ...
    antoniovillena antoniovillena January 2013 Brand new software
  • 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 …

    ... (7 bits)
    inc hl
    sll e ; opcode ... hl, de ; HL = destination - offset - 1
    pop de ; DE = destination
    ldir
    pop hl ...
    antoniovillena antoniovillena January 2013 Brand new software
  • 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 …

    ... hl, de ; HL = destination - offset - 1
    pop de ; DE = destination
    ldir
    pop hl ...
    exit:
    pop de
    twice_rld_next:
    call ...
    Einar Saukas Einar Saukas January 2013 Brand new software
  • 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 …

    ... sbc hl, de ; HL = destination - offset - 1
    pop de ; DE = destination ...
    ldir
    exit: pop hl ; ...
    antoniovillena antoniovillena January 2013 Brand new software
  • 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 …

    ... sbc hl, de ; HL = destination - offset - 1
    pop de ; DE = destination ...
    ldir
    exit: pop hl ; ...
    Metalbrain Metalbrain January 2013 Brand new software
  • 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 …

    ... sbc hl, de ; HL = destination - offset - 1
    pop de ; DE = ... destination
    ldir
    exit:
    pop hl ...
    FrankT FrankT January 2013 Brand new software
  • 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 …

    ... sbc hl, de ; HL = destination - offset - 1
    pop de ; DE = ... destination
    ldir
    exit:
    pop hl ...
    antoniovillena antoniovillena 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…

    ...
    sbc hl, de
    jr nc, check
    add hl, de
    ld ... c, (hl)
    ld a, (de)
    ld (hl), a ...
    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…

    ... , a ; finish calculation
    sbc hl, de ; HL < DE ?
    jr nc, skip ...
    add hl, de
    ld c, (hl) ; swap contents (HL) and (DE)
    ld ...
    Einar Saukas Einar Saukas January 2013 Development
  • 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 …

    ... hl, de ; HL = destination - offset - 1
    pop de ; DE = destination
    copy_bytes:
    push hl ...
    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…

    ... , a ; finish calculation
    sbc hl, de ; HL < DE ?
    jr nc, skip ...
    add hl, de
    ld a, (hl) ; swap contents (HL) and (DE)
    ex ...
    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…

    ... step ld l, e ; de= i, hl= j, bc= k
    hl ; last= j
    push de
    ex de, hl
    ... call func
    sbc hl, bc
    add hl ...
    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…

    ... /> step ld l, e ; de= i, hl= j, bc= k
    ld ... de
    ex de, hl
    call func
    sbc hl, bc
    add hl ...
    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…

    ... , a ; finish calculation
    sbc hl, de ; HL < DE ?
    jr nc, skip ...
    add hl, de
    ld a, (hl) ; swap contents (HL) and (DE)
    ex ...
    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…

    ... /> step ld l, e ; de= i, hl= j, bc= k
    hl ; last= j
    push de
    ex de, hl
    ... call func
    sbc hl, bc
    add hl ...
    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…

    ... /> step ld l, e ; de= i, hl= j, bc= k
    hl ; last= j
    push de
    ex de, hl
    ... call func
    sbc hl, bc
    add hl ...
    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…

    ... , a ; finish calculation
    sbc hl, de ; HL < DE ?
    jr nc, skip ...
    add hl, de
    ld a, (hl) ; swap contents (HL) and (DE)
    ex ...
    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…

    ... /> step ld l, e ; de= i, hl= j, bc= k
    ld ... (last+1), hl ; last= j
    push de
    ex de, hl
    call ...
    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…

    ... hl
    ld hl, $f871
    add hl, de
    ex de, hl
    pop hl< ... br /> ofdone: ex (sp), hl ; store ...
    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…

    ... byte swap permutation
    sbc hl, de ; HL < DE ?
    jr nc, skip ...
    add hl, de
    ld b, (hl) ; swap contents (HL) and (DE)
    ld ...
    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…

    ... byte swap permutation
    sbc hl, de ; HL < DE ?
    jr nc, skip ...
    add hl, de
    ld c, (hl) ; swap contents (HL) and (DE)
    ld ...
    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…

    ... byte swap permutation
    sbc hl, de ; HL < DE ?
    jr nc, loop ...
    add hl, de
    ld c, (hl) ; swap contents (HL) and (DE)
    ld ...
    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…

    ... ; L = r1r2r3c1c2c3c4c5
    sbc hl, de ; HL < DE ?
    jr nc, skip ; skip ...
    add hl, de
    ld c, (hl) ; swap contents (HL) and (DE)
    ld ...
    antoniovillena antoniovillena January 2013 Development
  • Is this TZX OK?I'm in the middle of preserving a bunch of Danish MIAs and STPs. I'm slowly getting up to speed with MakeTZX. One tape is giving me some trouble. You…

    ...
    23806 LD HL,23760
    23809 LD DE,35000
    23812 ... LD A,(DE)
    23813 CP (HL)
    23814 INC HL
    23815 ... INC DE
    23816 ... XOR A
    23849 SBC HL,DE
    23851 JP NZ,00000 ...
    Andrew Barker Andrew Barker January 2013 MIA/STP/SDP
  • 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…

    ... byte swap permutation
    sbc hl, de ; HL < DE ?
    jr nc, skip ...
    add hl, de
    ld c, (hl) ; swap contents (HL) and (DE)
    ld ...
    Einar Saukas Einar Saukas January 2013 Development
  • Getting Unit CHS detail in +3e BASICHello there my fellow WoS'ers I would like to know if there are system VARS or PEEK's that I could use to get the CHS info within BASIC at the mome…

    ... ,0 ;starting partition
    ld hl,40000 ;address

    loop ... ,0 ;IDE device
    push hl ;save hl
    call $00c4 ;call ... =0

    pop hl ;recover hl
    ld e,64
    ld d,0
    add hl,de ;add 64 to address
    BCH BCH January 2013 Sinclair Basic
<1…18192021222324…34>

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