Hello, The file `sys/dev/pci/ncr.c' from the kernel snap shot I've got at home includes <i386/include/pio.h>. Should it (like com.c) be including <machine/pio.h>? This in turn begs the question, is any one using either of: dev/pci/ncr.c - on a non x86 pci bus dev/isa/com.c - on a non x86 isa (via bridge) bus Andrew