Read only memory is a type of memory that allows a user only to read or retrieve data from it using drives however, special types of ROM allow editing of data that has been stored on it.
Also read: types of computers

Depending on permanence of the instructions or data written on it. There are four types of read only memory namely:

  1. Mask read only memory. (MROM)
  2. Programable read only memory. (PROM)
  3. Erasable programable read only memory.(EPROM)
  4. Electrically erasable programable read only memory. (EEPROM)
  • M-ROM

This is a type ROM that allows writing of contents on it only once and the data can not be changed once written.

  • PROM

PROM allows the user to alter its contents only once after the data has been written on it.

  • EPROM

This type of ROM allows erasing of its contents by exposing it to ultra violet (UV) light and then reprogrammed using the same type of technology.

  • EEPROM

It allows erasing and reprogramming using electricity. An example of EEPROM is the BIOS.

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