
TABLE
OF
FEATURES
I.
INSTALLATION
0.
1.
2.
3
4.
5.
II.
SYSTEM MEMORY
III.
I/O
IV.
SYSTEM
V.
SYSTEM
VI.
SYSTEM
VII.
REAL
RAM
CONTENTS:
.......................
Mother
Power
Display
.
Keyboard
FDD/HDD
Setup
ADDRESS
TIME
Board
Supply
.........................P-
........................P-
.........................P-
...........................P-
MAP
MAP
TIMERS
INTERRUPTS.
DMA
.......................
...........................
CLOCK
.................
P-
...................P-
.... ...............P-
...................
....................
P-
P-
P-10
...
...............
P-11
P-12
AND
NONVOLATILE
P-13
3
3
5
6
6
6
7
8
9
VIII.
IBM
PC
Machine
Intel
AMD
is
AMI
is
PHOENIX
AWARD
CHIP
,
PC/XT
Corporation.
is
registered
registered
registered
is
registered
is
registered
and
SET
PC/AT
trademark
trademark
trademark
trademark
INFORMATION
are
registered
of
Intel
of
Advanced
of
American
trademark
of
Phoenix
of
Award
...............
trademarks
Corporation.
Micro
Megs
Software
of
Devices
trends
Technologies
Inc.
International
Inc.
Inc.
Ltd.
P-14
Business
p-1

II.
SYSTEM
ADDRESS
RANGE
000000-03FFFF
040000-07FFFF
080000-09FFFF
OAFFFF-OBFFFF
OCOOOO-ODFFFF
OEOOOO-OEFFFF
OFOOOO-OFFFFF
100000-3FFFFF
MEMORY
START
000K-
256K-
512K-
640K-
768K-
896K-
960K-
1024K-
-
END
256K
512K
640K
768K
896K
960K
1024K
4096K
MAP
FUNCTION
System
System
System
Display
Expansion
System
BIOS
(640
Expansion
___________________
memory
(2560
memory
(2560
memory
(1280
card
buffer
(1280
ROM
(1280
usage
(640
RAM
(30720
P-8

V.
IRQ
IRQ
IRQ
IRQ
IRQ
IRQ
IRQ
IRQ
IRQ
IRQ
IRQ
IRQ
IRQ
IRQ
IRQ
IRQ
SYSTEM
0
1
2
3
4
’
5
6
7
8
9
10
11
12
13
14
15
INTERRUPTS
Timer
output
Keyboard
Cascaded
Serial
Serial
Parallel
Floppy
Parallel
Real
Software
Reserved
Reserved
Reserved
80287
Hard
Reserved
time
disk
(Output
Interrupt
port
port
port
disk
port
clock
redirected
controller
0
buffer
2
(COM2)
1
(COMI)
2
(LPT2)
controller
1
(LPT1
from
t
)
INT
full)
Interrupt
OAH
controller
2
P-11

VII.
REAL
The
real
backuped
14
bytes
system
TIME
CLOCK
time
also
by
battery.
while
the
configuration
AND
includes
The
rest
(seyup)
NONVOLATILE
64
bytes
internal
is
clock
allocated
.
RAM
of
uses
RAM
to
ADDRESS
00
01
02
03
04
05
06
07
08
09
0A
0B
OC
0D
0E
OF
10
11
12
13
14
15
16
17
18
19-2D
2E-2F
30
31
32
33
34-3F
DESCRIPTION
Seconds
Second
alarm
Minutes
Minutes
alarm
Hours
Hours
alarm
Day
of
week
Date
of
month
Month
Year
Status
register
Status
register
Status
register
Status
register
Diagnostic
Shutdown
Diskette
Reserved
Fixed
Reserved
Equipment
Low
High
Low
High
Reserved
2
Low
High
Date
Information
Reserved
base
expansion
byte
expansion
drive
disk
memory
base
expansion
CMOS
expansion
century
________________________________
A
B
C
D
status
byte
type
byte
-
driver
A
and
type
byte
-
driver
C
and
D
byte
memory
memory
byte
memory
byte
checksum
memory
byte
memory
byte
byte
flags
(set
during
power
on)
B
P-13