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?