Number Function
simulation
Routine
13
14
17
18
19
22
23
31
35
42
44
46
47
48
51
56
57
63
64
68
69
93
94
96
LINK
GET
GET
Comments
Reads or writes direct access volumes
Returns from linked phase
Conditionally acquires user free
storage
Releases user-acquired free storage
Links control to another load phase
Deletes, then links control to another
load phase
Reads another
Deletes a
Manipulates free user storage
Terminates processing
Processes program interruptions
Effective
files
Activates a data file
Deactivates a data file
Manipulates partitioned directories
Activates a data file
Temporarily deactivates a data file
characteristics
Effective
Communicates with the terminal
Effective
Effective LINK
Effective
Sets timer interval and timer exit
routine
Effective
Effective
Allows processing
abend condition
Effective
command
Handles data set error conditions
Backs up to the beginning of the
previous record
Manipulates data recoras
Manipulates data blocks
Accesses
address
Tests
Terminal processing
Clears input queue
Adds or deletes an attention exit
level
Figure 22.