1 Comment

1. 

   AYESHA MUMTAZ on February 8, 2019 at 4:30 pm

   Q#1 In how many ways higher PC can operate?
   Answer:- (Page 319)
   Higher PCs can operate in two modes
   • REAL MODE
   • PROTECTED MODE
   Q#2 In FAT32, what is the size of FSInfo?
   Answer:- On a FAT32 volume, the FAT can be a large data structure, unlike on FAT16 where it is limited to a maximum of
   128K worth of sectors and FAT12 where it is limited to a maximum of 6K worth of sectors. Q#3 A disk is divided into three partition. What type of information is represented in code part of
   partition table?
   Answer:- (Page 219)
   code part contains valid executable code
   Q#5 How ISR sends EOI (End of interrupt) signals to master and slave .Required statement must be in C
   program
   Answer:- void irq_handler(registers_t regs)
   {
   // Send an EOI (end of interrupt) signal to the PICs.
   // If this interrupt involved the slave.
   if (regs.int_no >= 40)
   {
   // Send reset signal to slave.
   outb(0xA0, 0x20);
   }
   // Send reset signal to master. (As well as slave, if necessary).
   outb(0x20, 0x20);
   if (interrupt_handlers[regs.int_no] != 0)
   {
   isr_t handler = interrupt_handlers[regs.int_no];
   handler(&regs);
   }
   }
   Q#6 Suppose a disk is divided into two partition and we have read MBR at LBA=0 to get information
   about primary partition
   a) How many bytes of code part we need to skip to get information about primary partition?
   b) How many bytes of code part we need to read information?