2-27
SIMATIC PC RI25/45, Technical Description
C79000-G7076-C808-01
The following table shows the I/O address assignments.
Address
Size
Description
from
to
byte
Basic function
Additional functions
0000
000F
16
PiiX DMA 1
0020
0021
2
PiiX PIC 1 Interrupt controller
002E
002F
2
Configuration port Ultra I/O
0040
0043
4
PiiX timer1 (software clock/refresh/speaker)
0060
0060
1
Keyboard controller date
0061
0061
1
PiiX NMI, speaker control
0063
0063
1
PG configuration port write only
0064
0064
1
Keyboard controller CMD/STATUS
0070
0070
1
PiiX NMI enable, RTC Index
0071
0071
1
RTC date
0080
008F
16
PiiX DMA Page Register
00A0
00A1
2
PiiX PIC2 Interrupt controller
00B2
00B3
2
PiiX Power management control, status
00C0
00DE
31
PiiX DMA 2
00F0
00F0
1
Reset numeric error
0100
010F
16
Industrial Ethernet expansion card
usually free
0170
0177
8
Secondary IDE channel
01F0
01F7
8
Primary IDE channel
0200
020F
16
Game I/O expansion card
usually free
0278
027B
4
LPT 2 unassigned
02F0
02F7
8
GBIP adapter expansion card
usually free
02F8
02FF
8
COM2
0300
031F
32
Programming facility
can be switched off in Setup
then free
0320
033F
32
unassigned
(XT hard disk), SCSI adapter
(AHA1540B)
0340
035F
8
HighGraph (CPU) host interface expansion
card
usually free
I/O Address
Assignments
Motherboard