Functional Description
CPB904
Address Range
Function
Note
02F8h – 02FFh
COM2
RS232
0300h – 0301h
CPB904 FFD
–
0302h – 036Fh
External 16-bit ISA bus
External bus access
0370h – 0377h
Reserved
–
0378h – 037Fh
LPT1
–
0380h – 03AFh
Reserved
–
03B0h – 03DFh
EGA, VGA, CGA
–
03E8h – 03EFh
COM3
RS232
03F0h – 03F75h
FDD Controller
–
03F8h – 03FFh
COM1
RS232
0400h – FFFFh
External 16-bit ISA bus
External bus access
0CF8h – 0CFFh
Host PCI controller configuration registers
–
4.2.3 Interrupt
settings
Table below presents interrupt settings. Interrupt request configuration is performed in BIOS Setup.
Table 4.3:
Interrupt Settings
IRQ
Source
IRQ0 System
timer
IRQ1 Keyboard
IRQ2 8259
interrupt
IRQ3 COM2
IRQ4 COM1
IRQ5
Ethernet / USB / Audio
IRQ6 FDD
IRQ7 LPT
IRQ8 RTC
IRQ9
Ethernet / USB / Audio
IRQ10 Free
IRQ11 Free
IRQ12 Mouse
IRQ13
Reserved for math. coprocessor
IRQ14 HDD,
CompactFlash
IRQ15 COM3
C P B 9 0 4 U s e r M a n u a l
4-5
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