.xx "intro" "introduction to special files"
.xx "cons" "SYS16 console interface"
.xx "dc" "SYS16 disk driver for ANSI interface disks"
.xx "drum" "paging device"
.xx "lp" "line printer"
.xx "mem" "main memory"
.xx "newtty" "summary of the ``new'' tty driver"
.xx "null" "data sink"
.xx "pty" "pseudo-terminal device"
.xx "sio" "eight port terminal i/o multiplexer"
.xx "tc" "Streaming tape controller interface"
.xx "tty" "general terminal interface"
