rele    = 0.
exit    = 1.
fork    = 2.
read    = 3.
write   = 4.
open    = 5.
close   = 6.
wait    = 7.
creat   = 8.
link    = 9.
unlink  = 10.
exec    = 11.
chdir   = 12.
time    = 13.
mkdir   = 14.
chmod   = 15.
chown   = 16.
break   = 17.
stat    = 18.
seek    = 19.
tell    = 20.
/ mount is defined as a label in ux.s.
/ mount = 21.
umount  = 22.
setuid  = 23.
getuid  = 24.
stime   = 25.
quit    = 26.
intr    = 27.
fstat   = 28.
emt     = 29.
mdate   = 30.
smdate  = 30.
stty    = 31.
gtty    = 32.
ilgins  = 33.