Mysterious IRQ 9!
Posted on 1999-01-06
I have a SUN multi I/O card with 4 serial and 3 parallel possible. I am only using it as a 2nd parallel port. My system is heavily laden with peripherials and the card allows IRQs 3, 4, 5, 7, 9, 11, 12, and 15 to be used. I have it set to IRQ 9 and I/O address 3BC (LPT1). This setup works fine. The strange thing is that viewing the IRQs via the control panel/ system does NOT list IRQ 9 at all. In addition, when I look at LPT1's resources it shows the port correctly as 03BC-03BE BUT it does not list any IRQ as being assigned to that port (IRQ 9 was expected)! How come?? I thought that IRQ's had to be assigned to I/O ports. I know that IRQ's can sometimes be shared (but not port addresses). (No other peripheral is assigned with IRQ 9 on the system)