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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
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