Here's a scan of the oldest Emacs manual I could find in my files;
it's a copy that RMS handed to me in John McCarthy's office at
Stanford University (210 pages, 9MB):

    <http://thadlabs.com/FILES/Emacs-150_1980.09.05.pdf>

Prior to that manual (and tape) I was getting Emacs directly from
the DoD in the Pentagon (one of my customers at the time).

For those unaware, the original Emacs was funded by DARPA; the
bottom of the first page of the PDF at the above URL states:

" This report describes work done at the Artificial Intelligence
" Laboratory of the Massachusetts Institute of Technology.  Support
" for the laboratory's research is provided in part by the Advanced
" Research Projects Agency of the Department of Defense under
" Office of Naval Research contract N00014-75-C-0643.

At that time Emacs was running on MIT's ITS systems, DECsystem-20s,
Twenex, Foonly, and Systems Concepts systems.

ITS:    <http://en.wikipedia.org/wiki/Incompatible_Timesharing_System>

DEC-20: <http://en.wikipedia.org/wiki/DECSYSTEM-20>

Twenex: <http://encyclopedia2.thefreedictionary.com/TWENEX>

Foonly: <http://en.wikipedia.org/wiki/Foonly>

System Concepts: <http://en.wikipedia.org/wiki/Systems_Concepts>

It later ran on DEC's VMS systems and I was also using it on the
Alpha-based OSF/1 systems, and it's been on every system I have
since then, including all the systems shown here:

    <http://thadlabs.com/PIX/Thad_desk.jpg>

In the 1980s I was running Emacs on my first personal UNIX boxes,
the AT&T 3B1 (aka UNIXpc aka PC7300) and, while running the AT&T
Silicon Valley UNIX Users Group for the entirety of its existence,
I was showing-off Emacs on one of my 3B1 systems annualls at the
West Coast Computer Faire.  3B1 info here:

    <http://en.wikipedia.org/wiki/3B1>

I still have three fully-function 3B1 systems.  :-)