DATA SEGMENT STRING1 DB 99H,12H,56H,45H,36H DATA ENDS CODE SEGMENT ASSUME CS:CODE,DS:DATA START: MOV AX,DATA MOV DS,AX MOV CH,04H UP2: MOV CL,04H LEA SI,STRING1 UP1:MOV AL,[SI] MOV BL,[SI+1] CMP AL,BL JNC DOWN MOV DL,[SI+1] XCHG [SI],DL MOV [SI+1],DL DOWN: INC SI DEC CL JNZ UP1 DEC CH JNZ UP2 INT 3 CODE ENDS END START
Output
C:\TASM>masm str_desc.asm Microsoft (R) Macro Assembler Version 5.00 Copyright (C) Microsoft Corp 1981-1985, 1987. All rights reserved. Object filename [str_desc.OBJ]: Source listing [NUL.LST]: Cross-reference [NUL.CRF]: str_desc.asm(1): warning A4001: Extra characters on line 50760 + 450936 Bytes symbol space free 1 Warning Errors 0 Severe Errors C:\TASM>link str_desc.obj Microsoft (R) Overlay Linker Version 3.60 Copyright (C) Microsoft Corp 1983-1987. All rights reserved. Run File [STR_DESC.EXE]: List File [NUL.MAP]: Libraries [.LIB]: LINK : warning L4021: no stack segment C:\TASM>debug str_desc.exe -g AX=0B36 BX=0012 CX=0000 DX=0012 SP=0000 BP=0000 SI=0004 DI=0000 DS=0B37 ES=0B27 SS=0B37 CS=0B38 IP=0027 NV UP EI PL ZR NA PE NC 0B38:0027 CC INT 3 -d 0B37:0000 0B37:0000 99 56 45 36 12 00 00 00-00 00 00 00 00 00 00 00 .VE6............ 0B37:0010 B8 37 0B 8E D8 B5 04 B1-04 8D 36 00 00 8A 04 8A .7........6..... 0B37:0020 5C 01 3A C3 73 08 8A 54-01 86 14 88 54 01 46 FE \.:.s..T....T.F. 0B37:0030 C9 75 EA FE CD 75 E0 CC-0C 2A E4 40 50 8B C3 05 .u...u...*.@P... 0B37:0040 0C 00 52 50 E8 19 46 83-C4 04 50 8D 86 00 FF 50 ..RP..F...P....P 0B37:0050 E8 6F 70 83 C4 06 B8 CD-05 50 8D 86 00 FF 50 E8 .op......P....P. 0B37:0060 CA 0C 83 C4 04 B8 FF FF-50 8D 86 00 FF 50 8D 46 ........P....P.F 0B37:0070 80 50 E8 4D FA 83 C4 06-0A C0 75 03 E9 7B FF 5E .P.M......u..{.^ -q
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