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Another commonly used notation is to describe numbers as
x K or x M. Where 1K=1024 and 1M=1048576
(1048576=1024x1024). In this notation 655360 (that is
A0000h) is 640K.
Memory maps
All memory, whether it is on the motherboard or an
expansion card, is accessed somewhere in the
processor's address space.
The processor's address space can be thought of as a list
of locations, the locations are each identified by a number.
The first, or bottom, location is address 0.
Every address contains 8-bits of data, a byte. Each bit can
be thought of as a switch which can be either on or off. A
byte is like a bank of 8-switches, where each switch can
be on or off.
ON
ON
5
7
8
OFF
1
1
2
3
4
6
OFF
BIT
BYTE
So 1Mbyte of memory consists of 1048576 (see Numbers
and computers ) locations each containing one byte of data.
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