1. CS-401 Compute Architecture & Assembly Language Programming
Lecture-24
Real Time Interrupts and Hardware Interfacing

2. Lets revise the last lecture

3. Interrupts

4. PIC Operation Processor PIC ISR int 0x0 int 0x1 int 0x2 int 0x3

5. PIC Operation Processor PIC ISR int 0x0 int 0x1 int 0x2 int 0x3

6. IRQs

7. IO Operations

8. I/O Instructions mov dx,0x378 in al, dx out 0x21, al out dx, al
in al, 0x21
mov dx,0x378
in al, dx
out 0x21, al
out dx, al

9. Port 0x21 IRQ Mapping
Port
IRQ

10. Port 0x21 IRQ Mapping
Port
IRQ

11. Port 0x21 IRQ Mapping
Port
IRQ

12. Port 0x21 IRQ Mapping
Port
IRQ

13. Port 0x21 IRQ Mapping
Port
IRQ

14. Port 0x21 IRQ Mapping
Port
IRQ

15. Port 0x21 IRQ Mapping
Port
IRQ

16. Port 0x21 IRQ Mapping
Port
IRQ