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From: Hadden@HI-MULTICS.ARPA
Newsgroups: net.emacs
Subject: Re: MS-DOS emacs??
Message-ID: <861002155542.241228@HI-MULTICS.ARPA>
Date: Thu, 2-Oct-86 11:55:00 EDT
Article-I.D.: HI-MULTI.861002155542.241228
Posted: Thu Oct  2 11:55:00 1986
Date-Received: Sat, 4-Oct-86 06:43:59 EDT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The ARPA Internet
Lines: 9

you might try epsilon from lugaru software in pittsburgh(?).  it's
extendable in c, though rather than lisp.  they include source code to
all of their commands and a very good manual for the extension writer.
*and*, it only costs around $200.

there is also available a gosling emacs from unipress for a lot more
money, but i haven't tried it.

-geo