(a) Low-level software that is not usually changed. Firmware is now often stored in EEPROM or Flash memory, so it can be erased and updated.
(b) Historically, software that was stored in read-only chips. Since it could not be changed without a hardware change, it was called firmware.
(c) Commonly used to describe any software on a handheld device.
The firmware in my handheld is corrupted, and now it won't even boot.
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