OS_Dom, Open director memory

Register parameters

RST 20H, DEFW $FE06

IN:
     - 

OUT, if successful:
     Fc = 0
     IX = handle for Director memory

OUT, if failed:
     Fc = 1
     A = RC_ROOM
     IX = 0

Registers changed after return:
     ..BCDEHL/..IY same
     AF....../IX.. different

Notes

Internal operating system usage.