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85 of 22,824 files

1986 December 3

  • Text / Guides and how-tos
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************ Disk Mechanic Version 1.13 ************************ A>Debug TRQ5.BAS -a 858 858 NOP 859 NOP 85A NOP <CR> -W -Q ************ Disk Mechanic Version 3.20 ************************ A>Debug TRQ8.BAS -a 887 887 NOP 888 NOP 889 NOP <CR> -W -Q That's all you have to do to be able to use Disk Mechanic from your hard disk. ************ Disk Mechanic Version 5.00 B *********************** UNPROTECTION METHOD FOR DISK MECHANIC 5.00 B BY STEALTH PIRATES CORP. 1986 THE - IS THE DEBUG PROMPT, [◄─┘] IS THE RETURN KEY. BOOT UP WITH DOS IN DRIVE A. FIRST MAKE A BACKUP OF DISK MECHANIC USING DISKCOPY. PUT DEBUG IN DRIVE B, AND BACKUP IN DRIVE A. A>B:DEBUG TRQ8.BAS -A 6B4 ????:06B4 MOV AH,04 ????:06B6 STC ????:06B7 NOP ????:06B8 [◄─┘] -W -Q DISK MECHANIC IS NOW TOTALLY UNPROTECTED AND MAY BE COPIED COPY COMMAND OR DISKCOPY. ************ Disk Mechanic Version 5.01 *********************** How to unprotect DIAGRAM MASTER, version 5.01: First, MAKE A COPY of the original DIAGRAM MASTER diskette. NEVER tamper with your original disk! Using the COPY, RENAME DM.EXE to DM.XEX DEBUG DM.XEX At locations 4332, 4392, and 43B7 is the code which checks drive A for the presence of the signature sector. This code typically looks like: MOV AL,01 MOV AH,04 INT 13 We will patch the program so that it thinks all is well and doesn't bother to check the floppy: -u 4320 xxxx:4320 16 PUSH SS xxxx:4321 2A00 SUB AL,[BX+SI] xxxx:4323 B600 MOV DH,00 xxxx:4325 B500 MOV CH,00 xxxx:4327 B101 MOV CL,01 xxxx:4329 B001 MOV AL,01 xxxx:432B B404 MOV AH,04 xxxx:432D 06 PUSH ES xxxx:432E 33DB XOR BX,BX xxxx:4330 8EC3 MOV ES,BX xxxx:4332 CD13 INT 13 <---here's one! xxxx:4334 07 POP ES xxxx:4335 7338 JNB 436F xxxx:4337 80FC06 CMP AH,06 xxxx:433A 74E3 JZ 431F xxxx:433C 80FC80 CMP AH,80 xxxx:433F 7405 JZ 4346 -u 4380 xxxx:4380 2A00 SUB AL,[BX+SI] xxxx:4382 8A362900 MOV DH,[0029] xxxx:4386 8A2E2800 MOV CH,[0028] xxxx:438A 8A0E2400 MOV CL,[0024] xxxx:438E B001 MOV AL,01 xxxx:4390 B404 MOV AH,04 xxxx:4392 CD13 INT 13 <---here's one! xxxx:4394 59 POP CX xxxx:4395 7308 JNB 439F xxxx:4397 E2E4 LOOP 437D xxxx:4399 59 POP CX xxxx:439A A33A00 MOV [003A],AX xxxx:439D EB2E JMP 43CD xxxx:439F B90200 MOV CX,0002 -u 43b3 xxxx:43B3 B001 MOV AL,01 xxxx:43B5 B404 MOV AH,04 xxxx:43B7 CD13 INT 13 <---here's one! xxxx:43B9 59 POP CX xxxx:43BA 80FC04 CMP AH,04 xxxx:43BD 740B JZ 43CA xxxx:43BF E2E1 LOOP 43A2 xxxx:43C1 59 POP CX xxxx:43C2 C7063A00FFFF MOV WORD PTR [003A],FFFF xxxx:43C8 EB03 JMP 43CD xxxx:43CA 59 POP CX xxxx:43CB E2AC LOOP 4379 xxxx:43CD C3 RET xxxx:43CE 55 PUSH BP xxxx:43CF 8BEC MOV BP,SP xxxx:43D1 1E PUSH DS xxxx:43D2 B8E703 MOV AX,03E7 So here goes: -a 4332 xxxx:4332 NOP ;get rid of disk interrupt xxxx:4333 NOP xxxx:4334 <cr> ;to break out of assembly -a 4335 ;to "fix" the jump instruction xxxx:4335 JMP 436F xxxx:4337 <cr> ;break out -a 4392 xxxx:4392 NOP ;get rid of disk interrupt xxxx:4393 NOP xxxx:4394 <cr> ;break out -a 4395 xxxx:4395 JMP 439F ;fix the jump xxxx:4397 <cr> ;break out -a 43B7 xxxx:43B7 NOP ;get rid of disk interrupt xxxx:43B8 NOP xxxx:43B9 <cr> ;break out -a 43BD xxxx:43BD JMP 43CA ;fix last jump xxxx:43BF <cr> ;break out -w ;write it back out Writing 61C7 bytes -q ;end debug session RENAME DM.XEX DM.EXE ;restore the name Diagram Master, version 5.01, is now unprotected. Have fun! LET THERE BE SOFTWARE!
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