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Detailed descriptions
16.4 System resources
16.4.2
System resources used by the BIOS/DOS
The following table describes the system resources for the factory state of the device.
16.4.2.1
I/O address allocation
I/O address (hex)
from
0000
0010
0020
0022
0040
0044
0060
0061
0062
0064
0067
0070
0076
0081
0090
00A0
00A2
00C0
00E0
00F0
0110
0170
0178
01F0
01F8
0200
0208
02E8
02F8
156
Size
Description of the basic function
(bytes)
to
000F
16
DMA controller
001F
16
Motherboard resources
0021
2
Programmable interrupt controller
003F
30
Motherboard resources
0043
4
System timer
005F
28
Motherboard resources
0060
1
Keyboard controller
0061
1
System loudspeaker
0063
2
Motherboard resources
0064
1
Keyboard controller
006F
9
Motherboard resources
0075
6
System CMOS/real-time clock
0080
11
Motherboard resources
008F
15
DMA controller
009F
16
Motherboard resources
00A1
2
Programmable interrupt controller
00BF
30
Motherboard resources
00DF
32
DMA controller
00EF
16
Motherboard resources
00FE
15
Numeric data processor
016F
96
Not used
0177
8
Secondary EIDE channel
01EF
120
Not used
01F7
8
Primary EIDE channel
01FF
8
Not used
0207
8
Reserved for game port
02E7
224
Not used
02EF
8
Reserved
02FF
8
COM2
Possible alternative
function
Switchable in Setup,
then free
Switchable in Setup,
then free
SIMATIC Rack PC 847B
Operating Instructions, 06/2008, A5E02203168-01
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