MPE/iX is now supported. See L<README.mpeix>.
-MVS (OS390) is now supported. See L<README.os390>.
+MVS (aka OS390, aka Open Edition) is now supported. See L<README.os390>.
+
+Stratus VOS is now supported. See L<README.vos>.
=head2 Changes in existing support
=head1 Core Changes
-Todo.
+The length argument of C<syswrite()> is now optional.
+
+Better 64-bit support -- but full support still a distant goal. One
+must Configure with -Duse64bits to get Configure to probe for the
+extent of 64-bit support. Depending on the platform (hints file) more
+or less 64-awareness becomes available. As of 5.005_54 at least
+somewhat 64-bit aware platforms are HP-UX 11 or better, Solaris 2.6 or
+better, IRIX 6.2 or better. Naturally 64-bit platforms like Digital
+UNIX and UNICOS also have 64-bit support.
=head1 Supported Platforms
-Todo.
+VM/ESA is now supported.
+
+Siemens BS200 is now supported.
+
+The Mach CThreads (NeXTstep) are now supported by the Thread extension.
+
+=head1 New tests
+
+=over 4
+
+=item op/io_const
+
+IO constants (SEEK_*, _IO*).
+
+=item op/io_dir
+
+Directory-related IO methods (new, read, close, rewind, tied delete).
+
+=item op/io_multihomed
+
+INET sockets with multi-homed hosts.
+
+=item op/io_poll
+
+IO poll().
+
+=item op/io_unix
+
+UNIX sockets.
+
+=item op/filetest
+
+File test operators.
+
+=item op/lex_assign
+
+Guard against lexicals leaking (internal stuff).
+
+=back
=head1 Modules and Pragmata
+Lexical warnings pragma, "use warning;", to control optional warnings.
+
+Filetest pragma, to control the behaviour of filetests (C<-r> C<-w> ...).
+Currently only one subpragma implemented, "use filetest 'access';",
+that enables the use of access(2) or equivalent to check the
+permissions instead of using stat(2) as usual. This matters
+in filesystems where there are ACLs (access control lists), the
+stat(2) might lie, while access(2) knows better.
+
Todo.
=head1 Utility Changes