3com 509 and SmoothWall
I have used the 3c509b cards with Smoothwall. They must be configured as non-PnP using the 3c5x9cfg.exe utility available from 3com. The utility runs under DOS so a DOS boot floppy comes in handy. A Windows Emergency Boot floppy will work.
I have used the Autoconfigure option in the utility. It typically sets one card to IRQ 10, address 0x300 and the other to IRQ 11, address 0x210.
I then use the CMOS setup to flag IRQ 10 and IRQ 11 as "ISA Legacy".
Once the above is properly set, Smoothwall should install without a hitch.
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