cs1101_09A_lec19 - 1 The Computer's Memory(Conti nued...

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The Computer’s Memory (Conti nued) ROM (read-only memory) Information is stored permanently on a chip Contains the computer’s startup routine Data is not lost when computer’s power is off ( n onvolatile ) On a PC, ROM contains the BIOS (Basic Input/ Output System) CMOS (complementary metal oxide semico nductor memory) CS1101 - Lec03 1
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CS1101 - Lec03 2 The Computer’s Memory (Conti nued) Ø Flash memory   ² Nonvolatile  memory that can be erased electronically and rewritten ² Used for phones, pagers, portable computers, handheld computers, PDAs  Ø Virtual memory ² The ability of the CPU and the operating system software to use the hard  disk drive as additional RAM when needed  ² Good – no longer get “insufficient memory” error ² Bad - performance is very slow when accessing VM
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3 Buses A bus - a group of wir es that allows devices both inside and attach ed to the system unit t
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This note was uploaded on 03/10/2012 for the course CS 1101 taught by Professor Drxue during the Spring '11 term at City University of Hong Kong.

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cs1101_09A_lec19 - 1 The Computer's Memory(Conti nued...

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