Chapter 3
If the ISA add-on card has Onboard FDC to be set at
If the ISA add-on card has
COM2
COM1
(I/O:3F8H)
(I/O:3F8H)
!
!
!
!
X
X
X
!
X
!
!
!
!
!
X
!
X
!
X
X
X
!
X
!
X
X
X
X
COM4
COM3
(I/O:2E8H)
(I/O:3E8H)
!
!
X
X
!
!
X
!
X
!
X
!
X
!
!
!
!
!
X
X
X
X
X
X
X
!
X
!
Onboard Serial port to be set at
IRQ
PORT1
ASSIGNED
DISABLED
X
COM3
4
COM1
4
COM2
3
COM1
4
COM4
3
COM3
4
COM2
3
COM1
4
COM1
4
COM2
3
COM1
4
COM1
4
COM1
4
3-20
IRQ
PORT2
ASSIGNED
DISABLED
X
COM4
3
COM2
3
COM3
4
COM4
3
DISABLED
X
DISABLED
X
DISABLED
X
DISABLED
X
COM2
3
COM3
4
COM3
4
COM2
3
COM2
3