GSERV macro - is type 2, gets LOCAL lock.
Calls module IGC070.
GTF data is:
- R15 and R0
- No applicable data.
- R1
- Contents:
- Bytes
- Contents
- 0
- Mask indicating which bits in the graphic control byte (GCB)
should be reset.
- 1-3
- Address of a fullword field that identifies the DCB related
to the GCB in which bits are to be reset.
- PLIST
- 4 bytes displays the fullword pointed to by register 1. Byte
0 is a unit index factor used to locate the UCB address in the DEB
associated with the DCB. (The GCB to be reset is in the UCB).