Assignment of COM port addresses and interrupts (installation details)
Ensure that there is no conflict of hardware port addresses or interrupt re-
quests (IRQs) used by your system and the AT COM Board!
Essentially the AT COM Board has been designed to be configurable for a
non-shared IRQ9, IRQ10, IRQ11, IRQ12, or IRQ15 for COM5 and a sha-
red IRQ9, IRQ10, IRQ11, IRQ12, or IRQ15 for COM6,7,8 and even
COM5. The interrupt requests have to be enabled explicitly by jumpers on
the controller (pls. see chapter 3 and 4).
To assist you further, some hints to the assignment of interrupts are given
in this chapter. Please note, that only some possible conflicts are men-
tioned. There might be more possible!
IRQ9, conflict with powerfail interrupt of BEETLE systems
IRQ9 cannot be used with BEETLE systems, since this in conflict with the
powerfail interrupt. For other systems, no hint can be given for a conflict
that is likely to occur. So you will have to check your specific configuration.
IRQ10, conflict with COM3, COM4 of BEETLE systems
IRQ10 cannot be used with BEETLE systems, since this is in conflict with
COM3 and COM4. Factory settings of the BEETLE provide using IRQ10
for COM3 and COM4.
For other systems, no hint can be given for a conflict that is likely to occur.
So you will have to check your specific configuration.
IRQ11, most likely conflict SCSI controller or USB
The Adaptec product line of SCSI controllers uses IRQ11 as default. If you
have this type of controller, please check. Refer to your technical docu-
mentation, if a change of the configuration is required.
BEETLE systems factory settings provide to use shared IRQ10 for COM3
and COM4, but COM4 can be configured by jumpers on the motherboard
to use IRQ11 instead.
Some of the newer PCs (such as SNI’s Scenic Pro D5) use IRQ11 for
USB (Universal Serial Bus).
COM Board
GB - 13
