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Unformatted text preview: CSCI 120 Introduction to Computation Homework 6 Solution Saad Mneimneh Visiting Professor Hunter College of CUNY PART 1: I/O ports (a) Describe the difference between a serial port and a parallel port and list an example of each. ANSWER : With a serial port, information is communicated one bit at a time. With a parallel port, information is communicated by multiple bits in parallel. An example of a serial port is USB. An example of a parallel port is PATA. (b) Which of the following interfaces is recommended for hard drives in todays PCs: Skuzzy, IDE, PATA, SATA? Give at least two reasons for such preference. ANSWER : SATA is now recommended, for the following reasons: • SATA is serial (less wires) • affordable • SATA has a high bit rate (fast) • SATA has high addressing capacity (larger drives) (c) Explain the term “twisted pair wire” and elaborate on why they are pre- ferred over regular wires. ANSWER : A twisted-pair wire consists of two wires twisted together. One wire carries the opposite signal of the other. This eliminates interference with other wires. If another wire is affected, it is affected by both wires of the twisted pair. Since they carry opposite signals, the effect is cancelled. Moreover, evenpair....
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This note was uploaded on 03/27/2010 for the course CSCI 120 taught by Professor Saadmneimneh during the Spring '09 term at CUNY Hunter.
- Spring '09