| Static RAM (SRAM) is volatile memory and is often used in
cache memory and registers because it is a lot faster and does not
require refreshing like Dynamic RAM. SRAM retains information
and is able to operate at higher speeds than DRAM. Because
DRAM is a lot cheaper than SRAM, it’s common to see PC manu-
facturers use DRAM.
The BIOS (basic input/output system) uses ROM to control
communication with peripherals. The amount of RAM determines
the number of programs you can run simultaneously and how fast
they operate. RAM capacity can be expanded by adding extra
chips, usually contained in small circuit boards called dual in-line
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