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See the file VMSINSTALL for VMS installation information.
* Deficiencies of VMS GNU Emacs
All GNU Emacs features which on Unix work by running a Unix utility
in a subprocess currently do not work on VMS.
These include reading and sending mail, reading and posting netnews,
spelling correction, displaying the time and load in the mode line,
and the `sort-columns' command. (dired and sending output to printers
don't work in version 18, but will in version 19.) Naturally, the
commands to view Unix manual pages and execute Unix shell commands
also do not work.
It is not possible to fix these problems in a general way on VMS
because they involve interfaces to parts of the operating system which
work very differently on VMS. Each feature must be reimplemented
individually.
I hope that someone will send me an implementation for directory listing
on VMS. This should not be very hard to do. Most of the code you need
is already provided in [.src]dired.c.
The normal commands for running an inferior shell or lisp with I/O
through an Emacs buffer do not work on VMS in Emacs version 18, but
will work in version 19. For the meanwhile, you can create a DCL
subprocess which does I/O through an Emacs buffer and get a similar
effect. See the file [.lisp]vms-patch.el.
* Specifying terminal type.
To specify a terminal type for Emacs that is not known to VMS,
define the logical name EMACS_TERM with the terminal type as value.
Terminal types are looked up in the termcap data base, which is
found as the file `[etc]termcap.dat' in the Emacs distribution.
* Specifying file names.
GNU Emacs accepts both Unix and VMS file name syntax. Most Lisp
code that runs in Emacs uses Unix syntax so it can run everywhere.
Users on VMS will generally type file names with VMS syntax.
The EMACSLOADPATH logical name, if you use it, should contain
directory names in Unix syntax, separated by commas.
find-file prompts with the current directory. You can then type a
relative directory spec to get somewhere else in the hirearchy. For
instance:
Find File: emacs_library:[src][-.lisp]startup.el
is converted to emacs_library:[lisp]startup.el by
expand-file-name. The basic rule is:
][- is treated like /.. (dir:[file.sub][-.other] ==> dir:[file.other],
dir:[file.sub][-] ==> dir:[file])
][. elides the ][ (dir:[file][.sub] ==> dir:[file.sub])
][alpha backs up to the previous [ (dir:[file][other] ==> dir:[other])
a colon appearing after a ] forces a new "root" disk.
(dev:[file]dev2:[other] ==> dev2:[other])
expand-file-name also tries to be smart about decnet node names,
but this is not yet known to work.
* A possible problem.
For VMS versions 4.4 and up, make sure the file
SYS$SYSTEM:RIGHTSLIST.DAT has WORLD:R access. Emacs reads this file
to check file access. If this file does not have appropriate access,
Emacs may think that you cannot write any files.
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