Software stored in read-only memory (ROM) or programmable ROM (PROM).

Easier to change than hardware but harder than software stored on disk.

Firmware is often responsible for the behaviour of a system when it is first switched on.

A typical example would be a "monitor" program in a microcomputer which loads the full operating system from disk or from a network and then passes control to it.

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firewall code
firewall machine
fireworks mode
boot block
breath-of-life packet
communications software
Digital Linear Tape
Extended Architecture
first class module
First Fit
first generation computer
first generation language