Read Only Memory (ROM)

Read Only Memory (ROM):

The ROM is nonvolatile memory. It retains stored data and information if the power is turned off. In ROM, data are stored permanently and can’t alter by the programmer.
There are four types of ROM:

1. MROM (mask ROM)
2. PROM (programmable ROM)
3. EPROM (erasable programmable ROM)
4. EEPROM (electronically erasable and programmable ROM)