Example Assembler Listing

Assembly listing with machine code

By counting the bytes generated, it is possible to see how the numbers in the symbol table were derived.

                            DOSSEG
                            .MODEL    SMALL,C

                    DGROUP  GROUP     _DATA,STACK

 0000                    _DATA     SEGMENT   WORD PUBLIC    'DATA'
 0000  000A [            ARR  DB   10 DUP(?)
        00
       ]
 000A                    _DATA     ENDS

 0000                    STACK     SEGMENT   PARA STACK     'STACK'
 0000  0400 [                    DB   1024 DUP(?)
        00
       ]
 0400                    STACK     ENDS

 0000                    _TEXT     SEGMENT   WORD PUBLIC 'CODE'
                         ASSUME    CS:_TEXT,DS:DGROUP,SS:DGROUP

 0000  BA ---- R         START:  MOV       DX,DGROUP      ;SET UP DS REGISTER
 0003  8E DA                     MOV       DS,DX

                    ;READS AT MOST 10 CHARACTERS
                    ;WILL ACCEPT LESS IF ESC IS PRESSED
                                
 0005  B9 000A      MOV  CX,10
 0008  8D 1E 0000 R      LEA  BX,ARR
 000C  B4 01             MOV  AH,01H
 000E  CD 21        TOP: INT  21H
 0010  88 07             MOV  [BX],AL
 0012  3C 1B             CMP  AL,01BH
 0014  74 03             JZ   DONE
 0016  43           INC  BX  
 0017  E2 F5             LOOP TOP
 0019               DONE:                   
 0019  B8 4C00      MOV       AX,4C00H            ;TERMINATE PROGRAM
 001C  CD 21             INT       21H

 001E               _TEXT     ENDS
                              END       START

Symbol Table

                N a m e          	Type 	Value	Attr

ARR  . . . . . . . . . . . . . .   	Byte 	0000   _DATA   
DONE . . . . . . . . . . . . . .   	L Near	0019   _TEXT   
START  . . . . . . . . . . . . .   	L Near	0000   _TEXT   
TOP  . . . . . . . . . . . . . .   	L Near	000E   _TEXT