SVC 74 (0A4A)

DAR macro - is type 3, gets LOCAL lock.

Calls module IGC0007D.

GTF data is:
R15 and R0
No applicable information.
R1
Address of the parameter list.
PLIST up to 40 bytes.
It is a series of 4-byte entries. First entry has the format:
Bytes
Contents
0-1
Reserved.
2-3
Number of words in the parameter list.

Each additional entry contains the GACB address specified by the DAR macro instruction.