Question

write an 8086 ALP to generate an output triangle signal. In addition, the program stops with one key press

Answer 1

Let us take the program execute from the 2000H memory location.

ALP PROGRAM :

OUTPUT 2500AD
ORG 2000H
MOV AX,0000H
MOV CS,AX
MOV ES,AX
MOV DX,0FFE6H ;Initialise all 8255
MOV AL,80H ;ports as O/P ports
OUT DX,AL

START: MOV CX,0FFH ;set count
MOV AL,00H ;start from 0
UP: INC AL ;increment data for
MOV DX,0FFE0H ;+ive going slope
OUT DX,AL ;output at port A & B
MOV DX,0FFE2H
OUT DX,AL
LOOP UP
MOV CX,0FFH ;set count
MOV AX,CX ;start from FFh
DOWN: DEC AL ;decrement data
MOV DX,0FFE0H ;-ive going slope
OUT DX,AL   
MOV DX,0FFE2H
OUT DX,AL
LOOP DOWN
JMP SHORT START   

END

This app program to generate triangular wave using 8086 processor.

Thank you...