mknod \*- build special file
makes a directory entry and corresponding i-node
The first argument is the
if the special file is block-type (disks, tape) or
if it is character-type (other devices).
The last two arguments are
device (e.g. unit, drive, or line number).
The assignment of major device numbers is specific to each system.
For reference, here are the numbers for the MH 2C-644 machine.
Do not believe them too much.
5 Vermont Research moving-head disk
1 DC communications lines
3 DP synchronous interface