Read-only memory (usually known by its acronym, ROM) is a class of storage space media used in computers and other electronic devices. Since data stored in ROM cannot be customized, it is mainly used to distribute firmware (software that is very closely tied to exact hardware and improbable to require frequent updates).
Modern semiconductor ROM chips are not right away distinguishable from similar chips like RAM modules, apart from by the part numbers printed on the package.
In its strictest sense, ROM refers only to mask ROM (the oldest type of solid state ROM), which is made-up with the desired data enduringly stored in it, and thus can never be adapted. However, more contemporary types such as EPROM and flash EEPROM can be erased and re-programmed many times; they are still described as "read-only memory" because the reprogramming process is usually infrequent, comparatively slow, and often does not authorize random access writes to individual memory locations, which are likely when reading a ROM.
There are five basic ROM types:
* ROM
* PROM
* EPROM
* EEPROM
* Flash memory
Modern semiconductor ROM chips are not right away distinguishable from similar chips like RAM modules, apart from by the part numbers printed on the package.
In its strictest sense, ROM refers only to mask ROM (the oldest type of solid state ROM), which is made-up with the desired data enduringly stored in it, and thus can never be adapted. However, more contemporary types such as EPROM and flash EEPROM can be erased and re-programmed many times; they are still described as "read-only memory" because the reprogramming process is usually infrequent, comparatively slow, and often does not authorize random access writes to individual memory locations, which are likely when reading a ROM.
There are five basic ROM types:
* ROM
* PROM
* EPROM
* EEPROM
* Flash memory
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