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Computer Systems

School of Electrical Engineering and Computer Science

Assignment #4

Due Date: Nov 1, 07

Purpose: To understand Interrupt concept for IBM PC

References: Intel 80x86 Reference Manual or Textbook

Modify your program of assignment #3 and program to display your name randomly on the monitor. The cahracter might be displayed bold, highlighted, or normal.

When you input a character from the keyboard, stop displaying your name and display the red blinking character for 5 seconds. And then return to normal counting routine.

But you type in Character "X", your have to finish your program and back to the DOS.

You have to modify the vector address of interrupt service routine. Refer to the class web site for detail information.

Submission:

1. This assignment paper

2. Algorithm and or flowchart

2. Compiled program list

3. TA Signature of the program

Grade:

Assembly program operation ............... = 20

Program operation and TA signature....... 5

Documentation .................................................. 5

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30

1. Insert following routines in your program

1) Save the address of Interrupt Vector 9 to use to exit the program.

The present Interrupt address is for the Windows system.

mov ax, 0

mov ds, ax

mov bx, 09h * 04h; find the Int 9

mov dx, word ptr [bx]; Save it on the stack

push dx

mov dx, word ptr [bx]+2

push dx

2) Change the new address for Interrupt Vector 9 to use your program.

mov ax, 0

mov ds, ax

mov bx, 09h * 04h

cli; disable an interrupt

mov word ptr [bx], offset kbd_handler ; Load your keyboard ISR

mov word ptr [bx]+2, seg kbd_handler

sti; enable interrupts

3) Write your program to perform normal procedure.

For this lab, write code to display characters on the screen.

4) Pop the content of the stack before your program exits. If not, your keyboard is not working after it exits.

mov ax, 0

mov ds, ax

mov bx, 09h * 04h ; find Int 9 address again

cli; disable interrupt

pop dx

mov word ptr [bx], dx; back to normal address

pop dx

mov word ptr [bx]+2, dx

sti; enable interrupts

2. Define ISR routine and program as follows.

The ISR address is the sane as the step #2.

1) Save present general purpuse registers and flags such as.

push ax

push bx

................

2) Check the data ready for the keyboard status address: Port 64h.

in al, 64h

test al, 01h ; set 1 means ready for data

3) Read data from the keyboard data address : Port 60h

in al, 60h

4) Before exit, send the exit signal to Programmable Interrupt Control.

mov al, 20h

out 20h, al

5) Before exit, store back all registers you saved for interrupt.

pop bx

pop ax

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