Read-only memory (ROM) is a class of storage medium used in computers and other electronic devices. Information stored in ROM cannot be modified, or can be modified only slowly or with difficulty, so it is chiefly used to distribute firmware (software that is closely tied to specifichardware, & unlikely to need frequent updates).
In its strictest sense, ROM refers only to mask ROM (the oldest type of solid state ROM), which is fabricated with the desired knowledge permanently stored in it, & thus can seldom be modified. Despite the simplicity, speed and economies of scale of mask ROM, field-programmability often make reprogrammable memories more flexible & cheap.
Usually, on the other storage media, if executed to read the contents or knowledge,storage media must be turned on first before it is read, which of work requires some time. Things like this do not happen in the ROM.
On the computer (PC) modern BIOS is stored in ROM chips that can be electricallyre-writeable known as Flash ROM. That is why the term flash BIOS is more popular than ROM BIOS.
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