IBM System/360

Entry from
Control Program
Obtain
Main
Storage
Save
Registers
Set Bit
in UCB
to 0
Determine
Type
of I/O
Operation
Set Up
CCW
(1)
(2)
(3)
(9)
(10)
(13)
(14)
Yes
.------.., (16)
Process
Label
Restore
Registers
Release
Main
Storage
(20)
(21)
(22)
.----...1....-.--, (\9)
Set Bit
in UCB
to 1
Figure 5.
GenE=ral Flow of a Nonsta~dard Label Processing Routine After
RecHiving Control From the EOV Routine
Label Processing Routines 51