master file multiple interrupts?

[Doug Toppin]

We are running IBM Xenix 2 on the PC/AT.
I need to configure in a new device and don't understand something
in the 'master' file. I need to use IRQ-5 and when I went to add
it to master I found the 'pa' driver had it already. I noticed
that it also had 7 in vec2 and I was wondering why there were
two entries? If anyone knows why multiple vectors would be specified
when there is only a single device please let me know.
Thanks
Doug Toppin
uunet!melpar!toppin