The TWIG files have been transferred to National's mainframe for pre-
route simulation, which should match the simulation results from the
Mentor workstation.  The first attempt failed 2/1/88 and the National
engineer is currently massaging the files.  I don't expect any major
problems and still expect mask release about Feb. 15 and protos in
mid-March.
 The steps remaining before mask release are
pre-route simulation,
fault grading (one pass, gratis),
place & route,
post-route simulation.
-- Don