Volatile -- chapter 3

ROM

(Read only memory) a chip on the motherboard that is prerecorded with and permanently stores the set of instructions that the computer uses when you turn in on; permanent

Volatile

-RAM -CMOS

Nonvolatile

-ROM -PROM -EPROM --EEPROM --FLASH

Flash "similar to EEPROMs"

Chips that don't lose their memory when power is removed and can be burned using burners or circuitry within your computer. Flash memory is written block by block

EEPROM

Electronically erasable programmable read-only memory. You can erase and program the contents of an EEPROM by using a burner or special circuitry within your computer

EPROM

Erasable programmable read-only memory. You erase the contents of an EPROM chip by exposing its glass window to ultraviolet light. Then you can program the chip by using a PROM burner.

PROM "Programmable read-only memory"

PROM MUST BE PROGRAMMED AT THE FACTORY AND CAN BE PROGRAMMED ONLY ONCE USING A PROM burner.

CMOS

The storage location for BIOS configuration data. CMOS requires a battery to retain its information. Without the battery, CMOS loses its contents. Thus, despite what many sources say, it's volatile memory

RAM

The working memory for your computer. Because RAM is volatile, its contents are lost when power is removed. even for a very brief period.