Topic of the Day: Types of Read-Only Memory (ROM)

Masked ROM (MROM)

· It contains a pre-programmed set of data and instructions burnt onto the chip during the manufacturing process.

· The information once written cannot be changed.

Programmable ROM (PROM)

· It is manufactured as a blank chip which can be programmed using a special device called a PROM programmer or PROM burner.

· Once programmed, its contents cannot be modified or erased.

Erasable Programmable ROM (EPROM)

· It can be programmed multiple times unlike PROM.

· The chip contents can be erased and re-written by exposing it to strong ultraviolet (UV) light.

Electrically Erasable Programmable ROM (EEPROM)

· It can be programmed multiple times like EPROM.

· Unlike EPROM, the data can be erased and re-written electronically with no need of UV light.

· Selective data can be erased from the EEPROM without erasing the whole chip.

Test your knowledge: What type of ROM is a Flash Memory drive – MROM, PROM, EPROM, EEPROM?

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