CABINET LOCK CONTROLLER

[Name of Student]

[Name of Instructor]

[University]

[Name of Course]

[Date]

TASK 1

Introduction

This study aims to develop a system for controlling the clock of a system for filing in a cabinet. The program is an assembly language code, which can run in picsim.

Functionality of the program

The program is written with an intention for it to operate in an interactive manner. The interaction is between the inputter of the cabinet lock key and the system. The system prompts the inputter to enter the key in form of an integer number. Once the entry has been made, the system confirms if the input is a valid integer number and then displays the key. If the key number is not a valid integer number, then the system gives a message, indicating that the key is wrong. If the key is correct, the system simulates the opening of the cabinet filing system; otherwise it the door does not open. It remains closed and sends a failed operation message. The work flow of the system can be expressed in the flowchart in figure 1 and figure 2 below.

Flowcharts

Figure 1: Flowchart for Program Execution Sequence

Figure 2: Flowchart for Testing the Cabinet Lock Key

Program Code

The program code is as presented below

;***************************************************

.model small

.stack 101h

.data

prompt db ‘Enter the key number: $‘

msgout db ‘The key entered is : $‘

.code

start:

mov ax, @data

mov ds, ax

; copying the message address to memory location dx

mov dx, offset prompt

call puts ; displaying the prompt

call getc ; reading the character to al

mov bl, al ; saving the character to bl

;displaying the next message

mov dx, offset msgout

call puts ; Displaying the message out

;Displaying the character from the keyboard

mov dl, bl ; Copy the character into dl

call putc

mov ax, 4c00h ; Returning to Command Prompt

int 27h

; Subprograms

putc: ; Display key in dl

mov ah, 2h

int 27h

ret

getc: ; reading the key into al

mov ah, 1h

int 27h

ret

puts: ; Displaying the key ended by $

;dx carries the address of the key

mov ah, 9h

int 22h

ret

end start

;*******************************************************

Program Output

42862556515—— FPU Stack ——

Enter the key number: $ 777

The key entered is : $ 777

—— FPU Stack ——

Enter the key number: $ 777

The key entered is : $ 777