isapnp(4) on OpenBSD

The text 0474631e6780, as OpenBSD 5.1, OpenBSD 5.0, OpenBSD 4.9, OpenBSD 4.8, OpenBSD 4.7, OpenBSD 4.6, OpenBSD 4.5, OpenBSD 4.4 shipped it.

introduction to ISA Plug-and-Play support