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Please read the following instructions carefully before submitting assignment:

It should be clear that your assignment will not get any credit if:


  • The assignment is submitted after due date.
  • The submitted assignment does not open or file is corrupt.
  • Solution is copied from any other source.


Note: You have to upload only .doc file. Assignment in any other format (extension) will not be accepted.



The objective of this assignment is to enhance your knowledge about;


  • Software Interrupts
  • Real Time Interrupts and Hardware Interfacing







DC motor (fig 1) is operated through two terminals, whenever the potential difference is created (through batteries, cells etc) across these terminals the motor starts its motion.




Suppose we have connected a DC motor to our system’s parallel port through a secure circuitry (fig 3).


We wish to operate the DC motor through our parallel port (fig 2) using some input through our keyboard. Like “F” key for running motor in “Forward Direction”, “R” for “Reverse Direction”, “S” for “Stop” and “E” for “Exit from code”.


We have suggested that we will use parallel port’s Pin 2 and Pin 3 (the last 2 pins of parallel port’s data check fig 2 and table 1).



Pin 2

Pin 3













No Operation

Table 1


You have to write a code in assembly language that take an input character from keyboard (S, F, R and E) and on the basis of these characters transmit the code (with respect to the truth table) to the parallel port to operate that connected DC motor.


NOTE: your code only use ASCII code for Capital letters F, R, S and E as an input from the keyboard and will transmit the specific data to the parallel port. Through this program, we are interested in communicating with a DC motor through parallel port.


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Replies to This Discussion

agr hum 0x ki jaga h laga den to accept hogi assignment?like ox3100 ki jaga 3100h?

For CS401 Assignment#03 Solution See this link

which one is right page6 wali yah this link is right ???

is it right?

bta du yaar 2 mint reh gy hain


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