jmechner April 17, 2012
Attempted line ending fix

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    * purple.main
     lst off
    * The job of this routine is to set $DA to $01*                                ( in aux-zpage!!! )
    slot = $FD
    *-------------------------------------------------** HLS APPLE COPY PROTECTION* COPYRIGHT (C) 1987 HLS DUPLICATION** HLS 408-773-1500** Modified by Roland Gustafsson 8/25/89* for Prince of Persia copy protection.**-------------------------------------------------
    * ZERO PAGE
    OBJSCT = $07 ;PHYSICAL SECTOR #
    HDRC = $40HDRS = HDRC+1HDRT = HDRC+2HDRV = HDRC+3 HEADER SECTORLSRETRY = HDRC+4 ;NIB READ RETRIESPRETRY = HDRC+5 ;OBJSCT RETRIESNPTR = HDRC+6NPTRH = HDRC+7MEM1 = HDRC+8MEM2 = HDRC+9
    zpage = HDRCzpagelen = 13
    *-------------------------------------------------** Here is the code that ends up at $6321.* Assemble it and run "make.purple.hex" which* reverses the code and puts it in a text file.**-------------------------------------------------
     org $2000
     da len6321
     dum $6254zpagebuf ds zpagelen dend
     org $6321
    strt6321 jsr swapzpage lda #10 sta LSRETRY ldx slot lda $C089,X lda $C08E,X lda #:NIBS ; !!!!! LOW BYTE sta NPTR lda #>:NIBS ; !!!!! HIGH BYTE sta NPTRH:AGAIN lda #$80 sta PRETRY:M1 dec PRETRY beq :LSFAIL jsr RADR16 bcs :LSFAIL lda HDRS cmp #OBJSCT bne :M1
     ldy #0:M2 lda $C08C,X bpl :M2 dey beq :LSFAIL cmp #$D5 bne :M2 ldy #0
    :M3 lda $C08C,X bpl :M3 dey beq :LSFAIL cmp #$E7 bne :M3
    :M4 lda $C08C,X bpl :M4 cmp #$E7 bne :LSFAIL
    :M5 lda $C08C,X bpl :M5 cmp #$E7 bne :LSFAIL
     lda $C08D,X ldy #$10 bit $6 ;3 US. ( FOR //C):M6 lda $C08C,X bpl :M6 dey beq :LSFAIL cmp #$EE bne :M6
    * NOW AT 1/2 NIBBLES
     ldy #7:M7 lda $C08C,X * READ DISK DATA bpl :M7 cmp (NPTR),Y * COMPARE AGAINST TABLE bne :LSFAIL dey bpl :M7 bmi :GOOD:LSFAIL jmp :LSFAIL1
    * A O K
    :GOOD jsr swapzpage lda #0 sta $C009-zpagelen,x rol sta $DA-zpagelen,x sta $C008-zpagelen,x clc rts
    * FAILED
    :LSFAIL1 dec LSRETRY beq :ERROR jmp :AGAIN
    :NIBS db $FC,$EE,$EE,$FC db $E7,$EE,$FC,$E7
    * Note that drive motor is still on
    :ERRORswapzpage ldx #0:0 ldy zpagebuf,x lda zpage,x sty zpage,x sta zpagebuf,x inx cpx #zpagelen bne :0 rts
    *-------------------------------------------------** Read address mark*
    RADR16 ldy #$FD ;READ ADR HDR sty MEM1:RA1 iny bne :RA2 inc MEM1 beq :RAEXIT:RA2 lda $C08C,X bpl :RA2:RA3 cmp #$D5 bne :RA1 nop:RA4 lda $C08C,X bpl :RA4 cmp #$AA bne :RA3 ldy #3:RA5 lda $C08C,X bpl :RA5 cmp #$96 bne :RA3 lda #0:RA6 sta MEM2:RA7 lda $C08C,X bpl :RA7 rol sta MEM1:RA8 lda $C08C,X bpl :RA8 and MEM1 sta HDRC,Y eor MEM2 dey bpl :RA6 tay nop clc rts
    :RAEXIT sec rts
    len6321 = *-strt6321
     org
    *------------------------------------------------- EOF
     sav purple.main

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