2. Excellence Publication Co. Ltd. Volume 1 2.51 Volume 1

3. Excellence Publication Co. Ltd. Volume 1 2.52 A. Random Access Memory (RAM)  used to store temporary data during program executions  There are two types of RAM: Dynamic RAM Static RAM  constantly refreshed  slower  needs less power  cheaper  most common type  no need to refresh  faster  needs more power  more expensive  used as cache memory

4. Excellence Publication Co. Ltd. Volume 1 2.53 B. Read-Only Memory (ROM)  used to store permanent programs that boot the computer Main Memory Function Main Memory Function RAM ROM  store temporary data during program executions  store permanent programs that boot the computer and perform tasks Comparison of RAM and ROM

5. Excellence Publication Co. Ltd. Volume 1 2.54 Memory Units  the smallest memory unit is a bit  it can either represent a “0” or a “1”  larger memory units are (a) kilobyte (KB = 1024 bytes  2 10 bytes) (b) megabyte (MB = 1024 KB  2 20 bytes) (c) gigabyte (GB = 1024 MB  2 30 bytes)

6. Excellence Publication Co. Ltd. Volume 1 2.55 Explain the relationship between RAM and the running speed of a computer. State some possible factors which could affect this relationship.

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