Subject:   -23- Z buffer configuration on 4.0.5 RealityEngine
Date: 8 Apr 1994 00:00:01 EST

  Z buffer config on 4.0.5 RealityEngine: On some versions of IRIX
  4.0.5, mssize(4,24,1) (the default by pfAntiAlias) generates an
  unusable Z configuration.  For these machines, call mssize(4,32,1)
  followed by gconfig() in your pipe initialization routine and do not
  attempt to toggle antialiasing.