For generating square wave form using 8086 and 8255

ALP Program for interfacing DAC with 8086 using 8255 

       For generating square wave form

ASSUME CS : CODE

CODE SEGMENT

START:   MOV AL, 80H

                   OUT CWR, AL

LOOP1:    MOV AL, 00H

                   OUT PA_ADDR, AL

                   CALL DELAY

                   MOV AL, FFH

                   OUT PA_ADDR, AL

                   CALL DELAY

                   JMP LOOP1

                   MOV AH, 4CH

                   INT 21H

CODE ENDS

END START