outb(2) on Linux

The text 8c8376c1e204, as Debian 2.1 (Slink), Debian 2.0 (Hamm), Debian 1.3 (Bo), Debian 1.2 (Rex), Debian 1.1 (Buzz) shipped it.

port output inb, inw, inl, insb, insw, insl - port input outb_p, outw_p, outl_p, inb_p, inw_p, inl_p - paused I/O