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Various Unprotection Examples
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GSHACK
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GSHACK.ASM
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Assembly Source File
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1988-02-09
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3KB
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66 lines
;-----------------------------------------------------------------
; GSHACK.COM (C)1988 BY DAVID W. GUNNELL
; COMPILE WITH MICROSOFT MACRO ASSEMBLER 4.0 OR GREATER
; LINK WITH MICROSOFT LINKER - NOT OVERLAY LINKER
; EXE2BIN GSHACK HSHACK.COM
; TO USE SIMPLY MAKE A COPY OF GUNSHIP DISK A WITH
; COPYIIPC 3.09 OR GREATER ALWAYS USE A COPY ESPECIALLY
; IF YOUR ARE GOING TO INSTALL GUNSHIP ON A HARD DISK
; RUN GSHACK
; YOU CAN EITHER RUN GUNSHIP FROM FLOPPY OR INSTALL
; GUNSHIP ON HARD DISK.
; IF YOUR HARD DISK TAKES A SHIT SIMPLY MAKE ANOTHER
; WORKING COPY OF DISK A FROM YOUR UNINSTALLED ORIGINAL
; AND REPEAT THE ABOVE STEPS
; DISK B IS NOT COPY PROTECTED SO YOU CAN USE DOS DISKCOPY
; THIS HAS BEEN TESTED ON VERSION 429.01 OF GUNSHIP
; AND MAY NOT WORK ON ANY OTHER VERSION
; ESPECIALLY IF THEY MADE PROTECTION CHANGES
;-----------------------------------------------------------------
CODE SEGMENT PARA PUBLIC 'CODE'
ORG 100H
ASSUME CS:CODE, DS:NOTHING, ES:NOTHING, SS:NOTHING
ENTRY: JMP INSTALL
OLD13 DD ? ;OLD INT 13 SAVE AREA
NEW_INT13 PROC FAR
CMP DX,0 ;IS THIS A DRIVE 0 REQUEST
JNZ SKIP ;IF NOT GOTO OLD INT 13
CMP CH,04H ;IS THIS Q REQUEST FOR TRACK 4
JNZ SKIP
CMP CL,0 ;IS THIS A REQUEST FOR SECTOR 0
JNZ SKIP
NOP ;NOP'S ARE FOR TIMING DELAYS
NOP
NOP
NOP
NOP
NOP
NOP
POP AX
MOV AX,0D5DH ;PASS TO GUNSHIP WHAT ERROR
PUSH AX ;CODE HE WANTS
IRET
SKIP: JMP DWORD PTR CS:OLD13
NEW_INT13 ENDP
MESSAGE DB 'GUNSHIP HACK NOW INSTALLED',13,10
DB '(C) 1988 David W. Gunnell',13,10,'$'
INSTALL PROC NEAR
ASSUME CS:CODE, DS:CODE, ES:NOTHING, SS:CODE
MOV AX,3513H ;GET INT13 VECTOR ADDRESS
INT 21H ;THROUGH DOS
MOV WORD PTR OLD13,BX ;SAVE THE ADDRESS
MOV WORD PTR OLD13+2,ES
MOV DX,OFFSET NEW_INT13 ;POINT TO NEW INT 13 HANDLER
MOV AX,2513H ;CHANGE INT 13 VECTOR
INT 21H ;THROUGH DOS
MOV AH,9 ;PRINT INSTALL MESSAGE
MOV DX,OFFSET MESSAGE
INT 21H ;PRINT MESSAGE
INT 27H ;TERMINATE STAY RESIDENT
INSTALL ENDP
CODE ENDS
END ENTRY