DATA SEGMENT STR1 DB "00011100" NZ DW ? NO DW ? DATA ENDS CODE SEGMENT ASSUME CS:CODE, DS:DATA START: MOV AX, DATA MOV DS, AX LEA SI, STR1 MOV BX, 00H MOV DX, 00H MOV CX, 08H UP: MOV AX, [SI] ROR AX, 1 JNC ZE INC BX JMP DN ZE: INC DX DN: INC SI DEC CX JNZ UP MOV NZ, DX MOV NO, BX INT 3 CODE ENDS END START
Output
C:\TASM>MASM CZO.ASM Microsoft (R) Macro Assembler Version 5.00 Copyright (C) Microsoft Corp 1981-1985, 1987. All rights reserved. Object filename [CZO.OBJ]: Source listing [NUL.LST]: Cross-reference [NUL.CRF]: 50346 + 450310 Bytes symbol space free 0 Warning Errors 0 Severe Errors C:\TASM>LINK CZO.OBJ Microsoft (R) Overlay Linker Version 3.60 Copyright (C) Microsoft Corp 1983-1987. All rights reserved. Run File [CZO.EXE]: List File [NUL.MAP]: Libraries [.LIB]: LINK : warning L4021: no stack segment C:\TASM>DEBUG CZO.EXE -G AX=0018 BX=0003 CX=0000 DX=0005 SP=0000 BP=0000 SI=0008 DI=0000 DS=0B97 ES=0B87 SS=0B97 CS=0B98 IP=0029 NV UP EI PL ZR NA PE NC 0B98:0029 CC INT 3 -D 0B97:0000 0B97:0000 30 30 30 31 31 31 30 30-05 00 03 00 00 00 00 00 00011100........ 0B97:0010 B8 97 0B 8E D8 8D 36 00-00 BB 00 00 BA 00 00 B9 ......6......... 0B97:0020 08 00 8B 04 D1 C8 73 04-43 EB 02 90 42 46 49 75 ......s.C...BFIu 0B97:0030 F1 89 16 08 00 89 1E 0A-00 CC C4 06 FF 36 24 21 .............6$! 0B97:0040 B8 0A 00 50 E8 47 5E 83-C4 04 5E 8B E5 5D C3 90 ...P.G^...^..].. 0B97:0050 55 8B EC 81 EC 84 00 C4-5E 04 26 80 7F 0A 00 74 U.......^.&....t 0B97:0060 3E 8B 46 08 8B 56 0A 89-46 FC 89 56 FE C4 5E FC >.F..V..F..V..^. 0B97:0070 26 8A 47 0C 2A E4 40 50-8B C3 05 0C 00 52 50 E8 &.G.*[email protected]. -Q