Microsoft (R) Macro Assembler Version 5.10                  9/13/10 01:09:37
MINIMAL DEMO PROGAM CALC2                                   Page     1-1


       1				TITLE   MINIMAL DEMO PROGAM CALC2      
					                     
       2				        PAGE      ,132
       3				;---------------------------------------------------------;
       4				; Author: M.S. Alam                                       ;
       5				; Date: 9/25/1991                                         ;
       6				; Purpose: To demonstrate the simplest program structure  ;
       7				;          and write a program to add and subtract two 16-;
       8				;          bit numbers.                                   ;
       9				;**********************************************************
      10 0000				STACK   SEGMENT   PARA STACK 'STACK'
      11 0000  0040[			        DB 64 DUP('STACK')
      12	   53 54 41 43 4B	
      13			 ]	
      14				
      15 0140				STACK   ENDS
      16				;**********************************************************
      17 0000				DSEG    SEGMENT   PARA PUBLIC 'DATA'
      18 0000  00FF			DATA1   DW   0255
      19 0002  0FFF			DATA2   DW   4095
      20 0004  0000			SUM     DW   ?
      21 0006  0000			DIFF    DW   ?
      22 0008				DSEG    ENDS
      23				SUBTTL  Here is the main program
      24				;*********************************************************
      25				SUBTTL  The main program starts here
      26				;---------------------------------------------------------
      27 0000				CSEG     SEGMENT   PARA PUBLIC 'CODE'
      28 0000				OUR_PROG PROC  FAR
      29				         ASSUME CS:CSEG, DS:DSEG, SS:STACK
      30				;  Set up the stack to contain the proper values 
      31				;  so this program can return to debug.
      32				;  
      33 0000  1E			         PUSH DS           ; Put return seg. addr on stack
      34 0001  B8 0000			         MOV AX,0          ; Clear a register AX
      35 0004  50			         PUSH AX           ; Put zero return address on stack
      36				
      37				;  Initialize the data segment address
      38 0005  B8 ---- R		         MOV AX,DSEG      ;Initialize DS
      39 0008  8E D8			         MOV DS,AX
      40				;  -------------------------------------------------------------
      41				;  Perform the addition
      42				;
      43 000A  A1 0000 R		         MOV AX,DATA1     ; Load first word to reg AX
      44 000D  8B 0E 0002 R		         MOV CX,DATA2     ; Load second word to reg BX
      45 0011  03 C1			         ADD AX,CX        ; Add data at mem loc DATA1 AND DATA2
      46				;  Store the sum in memory
      47				;
      48 0013  A3 0004 R		         MOV SUM,AX       ; Store the result at mem loc SUM
      49				;  -------------------------------------------------------------
      50				;  Perform the subtraction
      51 0016  A1 0000 R		         MOV AX,DATA1     ; Reload first word to reg AX
      52 0019  91			         XCHG AX,CX       ; Move large number to AX
      53 001A  2B C1			         SUB AX,CX        ; Data at DATA2 - Data at DATA1
Microsoft (R) Macro Assembler Version 5.10                  9/13/10 01:09:37
MINIMAL DEMO PROGAM CALC2                                   Page     1-2
The main program starts here                                

      54				;  Store the difference in memory
      55				;        
      56 001C  A3 0006 R		         MOV DIFF,AX      ; Store the result at mem loc DIFF
      57				;  -------------------------------------------------------------
      58 001F  CB			         RET              ; Retrurn to DEBUG
      59 0020				OUR_PROG ENDP
      60 0020				CSEG     ENDS
      61				         END OUR_PROG
Microsoft (R) Macro Assembler Version 5.10                  9/13/10 01:09:37
MINIMAL DEMO PROGAM CALC2                                   Symbols-1


Segments and Groups:

                N a m e         	Length	 Align	Combine Class

CSEG . . . . . . . . . . . . . .  	0020	PARA	PUBLIC	'CODE'
DSEG . . . . . . . . . . . . . .  	0008	PARA	PUBLIC	'DATA'
STACK  . . . . . . . . . . . . .  	0140	PARA	STACK	'STACK'

Symbols:            

                N a m e         	Type	 Value	 Attr

DATA1  . . . . . . . . . . . . .  	L WORD	0000	DSEG
DATA2  . . . . . . . . . . . . .  	L WORD	0002	DSEG
DIFF . . . . . . . . . . . . . .  	L WORD	0006	DSEG

OUR_PROG . . . . . . . . . . . .  	F PROC	0000	CSEG	Length = 0020

SUM  . . . . . . . . . . . . . .  	L WORD	0004	DSEG

@CPU . . . . . . . . . . . . . .  	TEXT  0101h		
@FILENAME  . . . . . . . . . . .  	TEXT  calc2		
@VERSION . . . . . . . . . . . .  	TEXT  510		


     58 Source  Lines
     58 Total   Lines
     15 Symbols

  46100 + 407881 Bytes symbol space free

      0 Warning Errors
      0 Severe  Errors