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The Apollo guidance computer had firmware consisting of a specially manufactured core memory plane, called "core rope memory", where data were stored by physically threading wires through (1) or around (0) the core storing each data bit.Originally, it meant the contents of a writable control store (a small specialized high speed memory), containing microcode that defined and implemented the computer's instruction set, and that could be reloaded to specialize or modify the instructions that the central processing unit (CPU) could execute.
Common reasons for updating firmware include fixing bugs or adding features to the device.
Sometimes, third parties create an unofficial new or modified ("aftermarket") version of firmware in order to provide new features or to unlock hidden functionality; this is referred to as custom firmware.
An example is Rockbox as a firmware replacement for portable media players.
Some low-cost peripherals no longer contain non-volatile memory for firmware, and instead rely on the host system to transfer the device control program from a disk file or CD., most portable music players support firmware upgrades.
Some companies use firmware updates to add new playable file formats (codecs); iriver added Vorbis playback support this way, for instance.
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This may require ROM integrated circuits to be physically replaced, or flash memory to be reprogrammed through a special procedure.