eumel-ebcdic + sub 
open 
block i/o 
cluster 
name conversion 
eu disk descriptor.fd 
disk descriptor.dos.fd 
fat and dir.dos.fd 
eu disk descriptor.hd 
disk descriptor.dos.hd 
fat and dir.dos.hd 
fetch 
save 
disk manager 
manager/M.dos.fd 
manager/M.dos.hd
table thes.dos 
252 
253 
254 
255 
shard interface