IEI Integration LVDS-VGA-R10 - Manual (Page 10)

2.3.1 Interrupt Status Register Setup
(S1,Vector Address)
When data arrives at one of the four ports, it will generate
an interruption in the interrupt register. The PC software
can read this, and identify immediately which port generated
the interruption. This saves time, and makes programming
easier. When a data bit of the interrupt status register is set
to 1, the corresponding channel is selected to generate an
interruption. If the bit is 0,then no interruption is generated.
S1 controls the interrupt status register for the card, as shown
in he following figure.
S1 300H (default)
10
Interrupt Status Register S1
Bit Function
0 Port 1
1 Port 2
2 Port 3
3 Port 4
4 Not Used
5 Not Used
6 Not Used
7 Not Used