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Solution of Assignment No. 01
Total Marks: 00
Due Date: 29/Nov/2013
Please read the following instructions carefully before submitting assignment:
To understand the use of ISR and its services.
For any query about the assignment, contact at firstname.lastname@example.org
Question 1: Marks 00
Suppose we are going to program PIC. How can you write the C statements for the following requirements:
1. To access the values of registers.
2. To access the values of IRR (Interrupt Request Register)
3. To read the value of port 20 and place in a variable “a”.
4. To read the values of ISR (Interrupt Service Register).
5. To notify the slave PIC for EOI.
6. To declare a character for pointer that represents the starting address of keyboard buffer.
Question 2: Marks 00
Discuss the various methods to prevent a TSR program for memory resident repeatedly.
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Terminate and Stay Resident (TSR) is a computer system call in DOS computer operating systems that returns control to the system as if the program has quit, but keeps the program in memory, to be revived later by a hardware or software interrupt
Many software vendors use this call to create the appearance of multitasking by transferring control back to the terminated program on automatic or externally-generated events, such as pressing a certain key on the keyboard. Some TSR programs are effectively device drivers for hardware not directly supported by the operating system, while others are small utility programs offering frequently-used functionality such as scheduling and contact directories.
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