May 2014
Intermediate to advanced
320 pages
13h 41m
English
Content preview from Servicing Personal Computers, 3rd Edition
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26
Servicing
Personal
Computers
ADDRESS
(hex)
FFFFF
I
FC000
FBFFF
F0000
EFFFF
C0000
BFFFF
AOOOO
9FFFF
BIOS
ROM
(16K)
BIOS repeats
(48K)
Expansion ROMS
192K
Video display
128K
640K
RAM
Applications
System
use
>
1M
00000
Figure
1.21.
Typical memory
map
for
a
low-cost
PC
compatible
FFFFF
FC000
FBFFF
F0000
EFFFF
C0000
BFFFF
AOOOO
9FFFF
80000
7FFFF
00000
Resident operating
system
(ROS)
16K
ROS
repeats
(48K)
Expansion ROMS
192K
Video display
128K
512K RAM
Figure
1.22.
Simplified memory
map
for
an Amstrad
PPC512
example, have a total memory of 32K (note that it is not necessary to have all 64K available) in
which the operating system may exist in