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55 lines
1.4 KiB
Plaintext
Executable File
55 lines
1.4 KiB
Plaintext
Executable File
;-------------------------------
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; #RUNHELLO
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; search and destroy a protection check
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; in a startup file that runs the real
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; startup program after succeeding
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; e.g. Microzine 15, Alpine Tram Ride
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;-------------------------------
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!zone {
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_runhello
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lda gIsProDOS ; this exact protection is only
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beq .exit ; on DOS 3.3 disks (other patchers
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lda gIsPascal ; will catch other variations)
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beq .exit
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lda #$0F
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sta .sector+1
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.sector lda #$FF ; modified at runtime
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ldx #$04
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ldy #$05
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jsr compare
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!byte $20,$E3,$03,$85,$FB
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bcc +
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jmp .nextsector
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+
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lda .sector+1
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ldx #$19
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ldy #$06
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jsr compare
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!byte $CA,$10,$F8,$8A,$48,$20
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bcc +
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jmp .nextsector
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+
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lda .sector+1
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ldx #$21
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ldy #$06
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jsr compare
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!byte $A0,$01,$B1,$FA,$AA,$20
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bcc +
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jmp .nextsector
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+
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lda .sector+1
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sta gDisplayBytes
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lda #s_runhello
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jsr PrintByID
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lda .sector+1
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ldx #$26
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ldy #$01
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jsr modify
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!byte $2C
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.nextsector
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dec .sector+1
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bmi .exit
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jmp .sector
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.exit
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}
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