IBM System/360

(1)
Entry From
Control Program
Obtain
Main
Storage
Establish
Addressibil ity
of
Control
Information
(2)
Rewind and
Unload
Current
Volume
Issue
Mount
Message
(13)
8--~
Test Bits 1-2
in
JFCBMASK+5
(15a)
Write a
Standard
Volume Label
or Tapemark
Zero UCB
(17)
Vol Ser No. and
Set Mount
Switch
"ON"
(15b)
Get Label Type
From
JFCBLTYP
Field
Return
to
Control Program
Figure 7.
General Flow of an Editor Routine After Receiving Control
From the OPEN Routine
Label Processing Routines 59