Kontron
Appendix B: System Resources
ETX-P3/C3 User’s Guide
28
13.
APPENDIX B: SYSTEM RESOURCES
13.1
Interrupt Request (IRQ) Lines
IRQ #
Used For
Available
Comment
0
Timer0
No
1
Keyboard
No
2
Slave 8259
No
3
COM2
No
Note (1)
4
COM1
No
Note (1)
5
LPT2
Yes
Note (1, 2)
6
FDC
No
Note (1)
7
LPT1
No
Note (1)
8
RTC
No
9
-
Yes
10
COM4
No
Note (1, 2)
11
COM3
No
Note (1, 2)
12
PS/2 Mouse
No
Note (1)
13
FPU
No
14
IDE0
No
Note (1)
15
IDE1
No
Note (1)
Notes
:
1
If the “Used For” device is disabled in setup, the corresponding interrupt is available for other devices.
2
Unavailable if baseboard is equipped with an I/O controller SMC FDC37C669, and the device is enabled in
setup.
13.2
Direct Memory Access (DMA) Channels
DMA #
Used for
Available
Comment
0
Yes
1
Yes
2
FDC
No
Note (1)
3
LPT
No
Not available when LPT is used in ECP mode
4
Cascade
No
5
Yes
6
Yes
7
Yes
Note
:
1
If the “Used For” device is disabled in setup, the corresponding interrupt is available for other devices.
13.3
Memory Area
Upper Memory
Used for
Available
Comment
C0000h – CBFFFh
VGA BIOS
No
CC000h – DFFFFh
Yes
ISA bus or shadow RAM
E0000h – FFFFFh
System BIOS
No