IO$_CREATE
IO$_ACCESS IO$_DEACCESS IO$_MODIFY IO$_DELETE IO$_ACPCONTROL | P1 —
FIB descriptor address P2 — file name string address P3 — result string length address P4 —
result string descriptor address P5 — attribute
list address | IO$M_CREATE[3] IO$M_ACCESS[3] IO$M_DELETE[4] IO$M_DMOUNT[5] |