8086 Assembly Program for Subtraction of Two 8 bit Numbers

data segment
a db 2Ah
b db 13h
c dw ?
data ends

code segment
assume cs:code,ds:data
start:
mov ax,data
mov ds,ax
mov al,a
mov bl,b
sub al,bl
mov c,ax
int 3
code ends
end start

Output

C:\TASM>masm an8sub.asm
Microsoft (R) Macro Assembler Version 5.00
Copyright (C) Microsoft Corp 1981-1985, 1987.  All rights reserved.

Object filename [an8sub.OBJ]:
Source listing  [NUL.LST]:
Cross-reference [NUL.CRF]:

  50402 + 450254 Bytes symbol space free

      0 Warning Errors
      0 Severe  Errors

C:\TASM>link an8sub.obj

Microsoft (R) Overlay Linker  Version 3.60
Copyright (C) Microsoft Corp 1983-1987.  All rights reserved.

Run File [AN8SUB.EXE]:
List File [NUL.MAP]:
Libraries [.LIB]:
LINK : warning L4021: no stack segment

C:\TASM>debug an8sub.exe
-g

AX=0B17  BX=0013  CX=0022  DX=0000  SP=0000  BP=0000  SI=0000  DI=0000
DS=0B97  ES=0B87  SS=0B97  CS=0B98  IP=0011   NV UP EI PL NZ NA PE NC
0B98:0011 CC            INT     3
-d 0B97:0000
0B97:0000  2A 13 17 0B 00 00 00 00-00 00 00 00 00 00 00 00   *...............
0B97:0010  B8 97 0B 8E D8 A0 00 00-8A 1E 01 00 2A C3 A3 02   ............*...
0B97:0020  00 CC 86 72 FF 77 15 8A-86 70 FF 2A E4 50 B8 FD   ...r.w...p.*.P..
0B97:0030  05 50 FF 36 24 21 E8 77-63 83 C4 06 FF 36 24 21   .P.6$!.wc....6$!
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

C:\TASM>

Leave a Reply

Your email address will not be published. Required fields are marked *