SA_INTERRUPT implies fast interrupt handling.
No SA_INTERRUPT implies slow interrupt handling.
Unfortunately at the moment you can't mix the two on a shared interrupt
since the fast handling is done with interrupts turned off, not something
you want to do with the ethernet card. So you will have to try and get the
3COM and the SCSI device onto separate interrupts.
You will change the IRQ line either in the SETUP as you power up the PC or perhaps
through the EISA (yes, EISA) configuration utility. (May be you have a separate
PCI configuration utility....?)
Regards,
Dave