SVC 19 (0A13)

OPEN macro - is type 4, gets LOCAL lock.

Calls module IGC0001I.

If MODE=24 (R1 not = 0), GTF data is:
R15
No applicable data.
R0
Address of parameter list if R1 contains zero. Otherwise, no applicable data.
R1
Address of parameter list or zero. Contains zero if 'MODE=31' was specified in the OPEN macro.
PLIST
Four to 40 bytes of OPEN parameter list, which has a maximum length of 1020 bytes. The list is a series of 4-byte entries in the following format:
If MODE=31 (R1 = 0), GTF data is:
R15
No applicable data.
R0
Address of parameter list.
PLIST
Eight to 80 bytes of OPEN parameter list, which has a maximum length of 1020 bytes. The list is a series of 8-byte entries in the following format:
Parent topic: SVC descriptions