Chapter 3 Page 12 - Brainboxes CC-618 Hardware Manual

PCI Photon 4 Port RS232 Software Installation
PCI Photon 4 Port RS232 Users:
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Note the IRQ, I/O address and SISR Address values
In our example:
The IRQ = 11
The IRQ is the interrupt line shared amongst the Photon 4 Port
RS232 card's serial ports
The Bank address = FF40
The Bank address determines the COM Port Base addresses in the
following manner:
COM Base of port 1 = the Bank Address
COM Base of port 2 = the Bank Address + 8hex
COM Base of port 3 = the Bank Address + 10hex
COM Base of port 4 = the Bank Address + 18hex
The SISR Address = FFA0
The SISR Address is the Shared Interrupt Status Register, this is a
read-only register indicating which of the four serial ports requires
service by the driver software.

Chapter 3 Page 12