memory segmentions

1. Presented By: Majid Mehmood
2014-UETR-CS-15

2.  What is memory segmentation
 Different memory segments
 Segment Registers

3. “Memory segmentation is division of entire memory
into different memory parts or segmentations.”

5.  Size of each segment is 64KB
As in 8086 are registers are of 16-Bits , which can access
only 64-KB
 There are total 16 memory segments
8086 processor have 1-MB memory
16 * 64 = 1024 KB = 1 MB

6.  There can be any number of any segment depending
upon user program
 A segment may be located anywhere in memory
 Each of the segment is used for a specific task or
function

7.  Code Segment: is used for storing program
instructions
 Stack Segment: is used to store the return addresses
e.g. Function call or interrupt
 Data & Extra Segments: are used for storing
data entered by user

8.  In 8086 4 segment registers are present named as
1- Code segment register
2- Data segment register
3- Stack segment register
4- Extra segment register

9.  All registers are 16-Bit registers
 All registers are used for storing the starting address of
their corresponding memory segment.

10. Any Question … ?

11. Thank You
Thank You