Brainboxes CC-662 Hardware Manual page 16

PCI Photon 8 Port RS232
Figure 3-2. PCI Photon 8 Port RS232 Serial Card Settings.
Multiport Settings:-
j
Each Port should have the Multiport button selected, this tells
Windows 3.x that the port is one of several ports using a SISR
(shared interrupt status register).
k
The SISR Base address must be set as indicated by the
BBCARDS program.
l
The Card Port setting tells Windows whether this is the first,
second, third, fourth port etc. of the Photon 8 Port RS232 card.
Standard Settings:-
m
The COM Base is determined from the Bank Address as
described above, P63.
n
The IRQ must be set as indicated by the BBCARDS program.
o
The UART on the photon port is an enhanced 16550 called the
16950.
p
Having selected the 16950 you can then set the FIFO level at
128 bytes.
Software Installation
Chapter 3 Page 16