03-09-2016, 11:40 AM
1452344602-BCCch5.ppt (Size: 954 KB / Downloads: 37)
Main Memory
Main memory –
a collection of storage locations,
each with a unique identifier called the address.
Word-
Data are transferred to and from memory in groups of bits called words.
The number of bits that can be stored in one CPU register in a computer.
Memory Types
ROM (Read Only Memory)
Nonvolatile
Written by manufacture
Hold the booting program
Categories:
ROM
PROM(Programmable ROM)- Write once by user
EPROM(Erasable PROM)- physical removal and reinstallation by special device
EEPROM(Electronically EPROM)- without being removed from computer