8086 interfacing with 8253

Problem Statement: 8253

Write 8086 ALP to program 8253 in Mode 0, modify the program for hardware retriggerable Mono shot mode. Generate a square wave with a pulse of 1 ms. Comment on the difference between Hardware Triggered and software triggered strobe mode. Observe the waveform at GATE & out pin of 1C 8254 on CRO.

MODE 0

0000:4000  MOV AL,10

0000:4002  OUT 33, AL

0000:4004  MOV AL, 04

0000:4006 OUT 30, AL

0000:4007 INT 3

MODE 1

0000:4000  MOV AL, 12

0000:4002  OUT 33, AL

0000:4004  MOV AL, 04

0000:4006 OUT 30, AL

0000:4007 INT 3                                                  

MODE 2

0000:4000  MOV AL, 14

0000:4002  OUT 33, AL

0000:4004  MOV AL, 04

0000:4006 OUT 30, AL

0000:4007 INT 3

MODE 3

0000:4000  MOV AL, 16

0000:4002  OUT 33, AL

0000:4004  MOV AL, 04

0000:4006 OUT 30, AL

0000:4007 INT 3

MODE 4

0000:4000  MOV AL, 18

0000:4002  OUT 33, AL

0000:4004  MOV AL, 04

0000:4006 OUT 30, AL

0000:4007 INT 3

MODE 5

0000:4000  MOV AL, 1A

0000:4002  OUT 33, AL

0000:4004  MOV AL, 04

0000:4006 OUT 30, AL

0000:4007 INT 3