Appendix A
System Resourcen
Kontron User's Guide PC/104-520
46
A.3 I/O Address Map
The I/O-port addresses of the processor module PC/104-520 are functionally identical to a standard PC/AT.
All addresses not mentioned in this table should be available. We recommend that you do not use I/O
addresses below 0110h with additional hardware for compatibility reasons, even if available.
I/O
Address (h)
Use
Available
Comment
0000 - 001F
DMA Controller 1
No
Fixed
0010
System Control
No
Fixed
0020 - 003F
Interrupt Controller 1
No
Fixed
0040 - 005F
Timer, Counter
No
Fixed
0060 - 006F
Keyboard controller
No
Fixed
0070
NMI Enable Register
No
Fixed
0070 - 0077 Real Time Clock and CMOS
Registers
No
Fixed
0080
BIOS POST
No
Fixed
0081 - 008F
DMA Page Register
No
Fixed
0092
System Control
No
Fixed
00A0 00BF
Interrupt Controller 2
No
Fixed
00C0 - 00DF
DMA Controller 2
No
Fixed
00E0 - 00EF
System Control
No
Fixed
00F0 - 00FF
Math Coprocessor
No
Fixed
01F0 - 01F7
Fixed Disk
No
Fixed
0278 - 027F
Yes
Free in standard configuration, but possible address
of LPT2
02E8 - 02EF
Yes
Free in standard configuration, but possible address
of COM4
02F8 - 02FF
Serial Port 2
No
Default for COM2, free with different configuration
0378 - 037F
Parallel Port 1
No
Default for LPT1; free with different configuration
03B0 - 03DF
VGA
No
Fixed
03E8 - 03EF
Yes
Free in standard configuration, but possible address
of COM3
03F8 - 03FF
Serial Port 1
No
Default for COM1, free with different configuration
0A79
PnP Extension
No
Fixed
0400 - 0BFF
Yes
Free for user access
Note:
I/O-addresses above 0C00h are components of the PCI address space.
