Hi!

On an ancient 486 since several days -current kernel panics where
normally 'wdc0 at isa0 port 0x1f0-0x1f7 irq 14' was detected:

  NetBSD 1.5ZA (PCC3PO) #3: Mon Jan 14 20:40:01 MET 2002
      root@lwle5:/usr/src/sys/arch/i386/compile/PCC3PO
  cpu0: Intel 486DX (486-class)
  total memory = 36480 KB
  avail memory = 31544 KB
  using 481 buffers containing 1924 KB of memory
  mainbus0 (root)
  isa0 at mainbus0
  com0 at isa0 port 0x3f8-0x3ff irq 4: ns8250 or ns16450, no fifo
  com0: console
  com1 at isa0 port 0x2f8-0x2ff irq 3: ns8250 or ns16450, no fifo
  pckbc0 at isa0 port 0x60-0x64
  uvm_fault(0xc02cd6c0, 0x0, 0, 1) -> e
  fatal page fault in supervisor mode
  trap type 6 code c02c0000 eip c010858f cs c02f0008 eflags 10246 cr2 2d cpl ffffffff
  panic: trap

Markus.