Memory
What is read-only memory (ROM)?
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Memory chips that store
permanent data
and instructions
Nonvolatile memory, it is not
lost when computer’s
power is turned off
Three types:
Trapezoid: Firmware— Manufactured with permanently written data, instructions, or information
Firmware—
Manufactured with
permanently written
data, instructions,
or information
Trapezoid: EEPROM (electrically erasable programmable read-only memory)— Type of PROM containing microcode programmer can erase
EEPROM
(electrically
erasable programmable
read-only memory)—
Type of PROM
containing microcode
programmer
can erase
Trapezoid: PROM (programmable read-only memory)— Blank ROM chip onto which a programmer can write permanently
PROM
(programmable
read-only
memory)—
Blank ROM
chip onto which
a programmer
can write permanently