Detailed descriptions
16.4 System resources
SIMATIC Rack PC 840 V2
Operating Instructions, Edition 05/2006, A5E00248055-04
16-17
16.4
16.4
System resources
16.4.1
Currently Allocated System Resources
All system resources (hardware addresses, memory configuration, interrupt assignment,
DMA channels) are assigned dynamically by the Windows OS, depending on the hardware
configuration, drivers, and connected peripheral devices. You can view the current
configuration of system resources or possible conflicts with the following operating systems:
Windows NT 4.0
Start > Programs > Management (General) > Windows NT Diagnosis
Windows
2000 Professional/
XP Professional
Start > Run : In the Open dialog, enter
msinfo32
and confirm with OK
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
up to
Size
(bytes)
Description of the basic function
Possible alternative
function
0000
000F
16
DMA controller
0010
001F
16
Motherboard resources
0020
0021
2
Programmable interrupt controller
0022
003F
30
Motherboard resources
0040
0043
3
System timer
0044
005F
28
Motherboard resources
0060
0060
1
Keyboard controller
0061
0061
1
System loudspeaker
0063
0063
2
Motherboard resources
0064
0064
1
Keyboard controller
0067
006F
9
Motherboard resources
0070
0075
6
System CMOS/real-time clock
0076
0080
138
Motherboard resources
0081
008F
15
DMA controller
0090
009F
16
Motherboard resources
00A0
00A1
2
Programmable interrupt controller