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80286
BASE
ARCHITECTURE
r--------,
20000
CS
MAIN
PROCEDURE
0
_____
...
0
_____
...
2000
~----..,
o
___
~-
...
O~""';""';
_
__I
L
_______
...J
CURRENTLY
ACCESSIBLE
8000
r-----..,
PROCEDURE
A
O~
___
__I
7253051
DATA (A)
L..-
__
--I
8600
r-----.,
0'"-
____
..1
I
DATA (B)
0
..
____
--1
Figure 2-1. Segmented Virtual Memory
G3010B
A byte
is
8 contiguous bits starting
on
an addressable byte boundary. The bits are numbered 0 through
7,
starting from the right. Bit 7
is
the most significant bit:
o
I I i
BYTE
, I
A word
is
defined as two contiguous bytes starting
on
an arbitrary byte boundary; a word thus contains
16
bits. The bits are numbered 0 through
15,
starting from the right. Bit
15
is
the most significant bit.
The byte containing bit
0 of the word
is
called the
low
byte; the byte containing bit
15
is
called the
high byte.
15 0
I : :
~IGH:B+:
: I : :
+W:BY+:
: I
LOCATION N + 1
LOCATION N
2-2