mirror of
https://github.com/a2-4am/passport.git
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190 lines
4.3 KiB
Plaintext
190 lines
4.3 KiB
Plaintext
;-------------------------------
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; #SIERRA13
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; search and disable a self-decrypting
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; protection check used on some Sierra
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; disks
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;
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; Cranston Manor
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; Jawbreaker
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; Missile Defense
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; Mission Asteroid
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; Pegasus ][
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; Threshold
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;
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; module by qkumba
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;-------------------------------
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!zone {
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lda gIsDOS32
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bne .jmpexit
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;Cranston Manor/Wizard and the Princess
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;secondary protection
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ldy #10
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jsr SearchTrack
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!byte $A9,$24 ;LDA #$24
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!byte $8D,$1E,$B9 ;STA $B91E
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!byte $A9,$00 ;LDA #$00
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!byte $8D,$7F,$89 ;STA $897F
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bcs +
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inx
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inx ;patch the STA
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jsr modify1
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!byte $AD ;LDA
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lda #$24
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sta $B91E
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.jmpexit
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jmp .exit
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;Cranston Manor/Wizard and the Princess
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;tertiary protection
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+ ldy #10
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jsr SearchTrack
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!byte $A9,$1E ;LDA #$1E
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!byte $8D,$7D,$BE ;STA $BE7D
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!byte $A9,$BA ;LDA #$BA
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!byte $8D,$7E,$BE ;STA $BE7E
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bcs +
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pha
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tay
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txa
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pha
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tya
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pha
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txa
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pha
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tya
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ldy #10
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jsr modify
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!byte $A9,$A0 ;LDA #$A0
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!byte $8D,$8C,$BE ;STA $BE8C
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!byte $A9,$B9 ;LDA #$B9
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!byte $8D,$8D,$BE ;STA $BE8D
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pla
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sec
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sbc #$0D
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tax
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pla
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ldy #10
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jsr compare
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!byte $A9,$85 ;LDA #$85
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!byte $8D,$7D,$BE ;STA $BE7D
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!byte $A9,$6B ;LDA #$6B
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!byte $8D,$7E,$BE ;STA $BE7E
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bcs ++
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ldy #10
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jsr modify
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!byte $A9,$A0 ;LDA #$A0
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!byte $8D,$8C,$BE ;STA $BE8C
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!byte $A9,$B9 ;LDA #$B9
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!byte $8D,$8D,$BE ;STA $BE8D
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lda #<.swaptrk
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sta $BE7D
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lda #>.swaptrk
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sta $BE7E
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++ pla
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clc
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adc #$48
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tax
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pla
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jsr modify2
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!byte $A0,$B9
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bvc .jmpexit
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.swaptrk
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ldy $478
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cpy #$c0
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beq .swapped
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cmp #2
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bne .try4
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asl
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bne .swapped
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.try4
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cmp #4
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bne .swapped
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lsr
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.swapped
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jmp $BA1E
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;Threshold secondary protection
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+ ldy #11
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jsr SearchTrack
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!byte $A9,$00 ;LDA #$00
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!byte $AA ;TAX
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!byte $5D,$00,$96 ;EOR $9600,X
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!byte $E8 ;INX
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!byte $D0,$FA ;BNE *-4
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!byte $C9,$F3 ;CMP #$F3
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bcs +
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pha
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txa
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adc #$0A
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tax
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pla
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jsr modify1
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!byte $FC
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bvc .exit
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;Missile Defense
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+ ldy #17
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jsr SearchTrack
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!byte $20,$00,$8F ;JSR $8F00
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!byte $20,$00,$90 ;JSR $9000
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!byte $20,$00,$8F ;JSR $8F00
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!byte $A9,$00 ;LDA #$00
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!byte $85,$03 ;STA $03
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!byte $A9,$20 ;LDA #$20
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!byte $85,$02 ;STA $02
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bcs +
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jsr PrintByID
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!byte s_sierra
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inx
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inx
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inx ;patch the second JSR
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jsr modify1
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!byte $2C ;LDA
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bvc .exit
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;Cranston Manor, etc.
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+ ldy #14
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jsr SearchTrack
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!byte $A0,$00 ;LDY #$00
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!byte $A9,$55 ;LDA #$55
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!byte $59,WILDCARD,WILDCARD ;EOR $xxxx,Y
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!byte $99,WILDCARD,WILDCARD ;STA $xxxx,Y
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!byte $88 ;DEY
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!byte $D0,$F5 ;BNE *-9
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!byte $EA ;NOP
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bcs .exit
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cpx #$50
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bcc +
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tay
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dey ;Pegasus code spans pages
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tya
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clc
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+ sta .adjust+1
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adc #BASEPAGE
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jsr PrintByID
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!byte s_sierra
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ldy #8
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jsr SearchSector
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!byte $85,WILDCARD ;encoded BNE *+xx
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!byte $DD ;encoded DEY
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!byte WILDCARD,$A0 ;encoded Bxx *-9
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!byte $E8,$DD,$95 ;encoded LDA $C088,X
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bcs .exit
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inx
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.adjust lda #$d1
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jsr modify1
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!byte $55 ;encoded zero
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lda #TRUE
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sta gIsSierra13
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.exit
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}
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