I've noticed that the pnpdump utility has been dropped in a couple different distros. Aside from installing the pnpdump package, you can try using the lspci command. Running as root:
lspci -vv
should give you a very verbose listing of what is on the PCI busses. I'm not positive if an ISA card will showup, but I believe the ISA slots are still routed over the PCI buss, so it should.
HTH
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