Problems in IO CS 1550 Recitation December 2 nd /4 th, 2002 The questions in this slide are from Andrew S. Tanenbaum's textbook page 376, 377.

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Presentation transcript:

Problems in IO CS 1550 Recitation December 2 nd /4 th, 2002 The questions in this slide are from Andrew S. Tanenbaum's textbook page 376, 377.

CHAP The clock interrupt handler on a certain computer requires 2 msec (including process switching overhead) per clock tick. The clock runs at 60 Hz. What fraction of the CPU is devoted to the clock? 2 * 60 = 120 msec 120 msec / 1 sec = 120 msec / 1000 msec = 12%

CHAP Assuming that it takes 10 nsec to copy a byte, how much time does it take to completely rewrite the screen of an 80 character * 25 line text mode memory- mapped screen? What about a 1024*768 pixel graphics screen with 24-bit color?

A video RAM image –simple monochrome display –character mode Corresponding screen –the x s are attribute bytesfrom Dr. Amer’s slides How characters are displayed

Text Mode: 2 * 80 *25 = 4000 bytes 4000 * 10 nsec = nsec = sec Graphics: 24 bit color  3 bytes per pixel 1024 * 768 * 3 = bytes * 10 nsec = nsec = sec