; This probram adds two 8-bit words in the memory locations
;called NUM1 and NUM2. The result is stored in the memory location called
; RESULT. If there was a carry from teh addition it will be stored as 0000 
;0001 in the location CARRY.

DATA SEGMENT

NUM1 DB 15h  ;First number is stored here
NUM2 DB 20h  ; Second number stored here
RESULT  DB  ? ; Put sum here 
CARRY DB ?  ; Put any carry here
DATA ENDS
CODE SEGMENT
           ASSUME CS:CODE, DS:DATA
START:    MOV AX, DATA                        ;Initialize data segment
               MOV DS, AX ; register            ; register
               MOV AL, NUM1            ; Get the first number
               ADD AL, NUM2            ; Add it to 2nd number
               MOV RESULT, AL          ; Store the result
               RCL AL, 01                ; Rotate carry into LSB
               AND AL, 00000001B      ; Mask out all but LSB
               MOV CARRY, AL ; Store the carry result
              MOV AX, 4C00H
               INT 21h
CODE ENDS
               END START    

; This probram adds two 8-bit words in the memory locations 
;called NUM1 and NUM2. The result is stored in the memory location called 
; RESULT. If there was a carry from teh addition it will be stored as 0000 
;0001 in the location CARRY. 

        org     100h                    ;code starts at offset 100h
        use16                           ;use 16-bit code
        jmp     START

NUM1 DB 15h ;First number is stored here 
NUM2 DB 20h ; Second number stored here 
RESULT DB ? ; Put sum here 
CARRY DB ? ; Put any carry here 

START:
MOV AL, [NUM1] ; Get the first number 
ADD AL, [NUM2] ; Add it to 2nd number 
MOV [RESULT], AL ; Store the result 
RCL AL, 01 ; Rotate carry into LSB 
AND AL, 00000001B ; Mask out all but LSB 
MOV [CARRY], AL ; Store the carry result 
MOV AX, 4C00H 
INT 21h 
    

FORMAT MZ

SEGMENT _DATA ; CODE and DATA are reserved words in fasm,
              ; so other have to be used for segment names

NUM1 DB 15h ;First number is stored here
NUM2 DB 20h ; Second number stored here
RESULT DB ? ; Put sum here
CARRY DB ? ; Put any carry here

SEGMENT _CODE

START: MOV AX, _DATA ;Initialize data segment
MOV DS, AX ; register ; register
MOV AL, [NUM1] ; Get the first number
ADD AL, [NUM2] ; Add it to 2nd number
MOV [RESULT], AL ; Store the result
RCL AL, 01 ; Rotate carry into LSB
AND AL, 00000001B ; Mask out all but LSB
MOV [CARRY], AL ; Store the carry result
MOV AX, 4C00H
INT 21h

ENTRY _CODE:START