Lahore Leads University

2.  Name: M LUQMAN KHAN.
 Program: BSCS (A)
 ROLL NO: F12-1141

3.  Main Memory
 Main Memory Organization
 Main Memory Capacity
 Random Access Memory
 Read only-Memory
 Programmable Read-only Memory
 Erasable Programmable Read-only
Memory
 Cache Memory

4.  Every main memory
is directly attached
to the
motherboard .
 Every computer can
not display the result
with out main
memory.

5.  Storage Capacity
 Access Time
 Cost per bit of storage
 Volatile
 Random Access

6.  A primary storage or main
memory of computer
system is made up of
several small storage area
called location or cell.
 Each of these location can
be store a fixed number of
bit called word length of
the memory.

7.  Main memory capacity of a large
computer system is normally more then
that of smaller system.
 Memory capacity normally stated
 Kilobytes 1024 (bytes)
 Megabytes 1048576(bytes)
 Gigabytes 107374824 (bytes)

8.  RAM is the volatile
memory.
 RAM memory
consist of some
integrated circuit
chip either on the
motherboard or on
a small circuit
board attached to
the motherboard.

9.  A special type of
RAM called ROM.
 It is non-volatile
memory chip in
which data to
stored
permanently.
 Data store in a
ROM chip can not
be change.

10.  There are tow types of
PROM.
 A manufacturer
programmed ROM
one which data is
burnt in by the
manufacturer of
electronic equipment.
 A user PROM is which
a user can load and
store “read-only”
programs and data.

11.  There are tow
types.
 Ultra violet EPROM
 Electrically EPROM
 Flash memory

12.  The Cache memory is
a small memory
directly
accessible by the
processor.
 Small size, extremely
fast.
 When ever data is
required by the
processor it first checks
in the Cache.
 Current cache size is
2MB or more.