CS609 - System Programming Finalterm Subjective Paper July 2012

1. DTE want to communicate with DCE sing RC232c protocol, how does this communication start and end ,identify steps?
2. Write down the structure of COM files?
3. How many maximum root directory entries are possible in FAT12 and FAT16?
4. What is MFT?
5. function that will convert BCD to ASCII code?
6. What is the major disadvantage of programmed I/O?
7. how many bytes are used in FCB in FAT 32?
8. What is the disadvantage of undocumented services of interrupts?
9. What is virus?
10. What is cluster? Describe its structure?
11. How much state of viruses?