8086 Assembly Program to Count Number of 0’s and 1’s from a String

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.*.@P.....RP.
-Q

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