Original "Spacewar" game w/source code

I've seen interest in some of the old games, found this link with a playable
java applet and links to the source code:



http://lcs.www.media.mit.edu/groups/el/projects/spacewar/

Copy of the readme:

Spacewar! was conceived in 1961 by Martin Graetz, Stephen Russell, and Wayne
Wiitanen. It was first realized on the PDP-1 in 1962 by Stephen Russell,
Peter Samson, Dan Edwards, and Martin Graetz, together with Alan Kotok,
Steve Piner, and Robert A Saunders. Spacewar! is in the public domain, but
this credit paragraph must accompany all distributed versions of the
program. 
This is the original version! Martin Graetz provided us with a printed
version of the source. We typed in in again - it was about 40 pages long -
and re-assembled it with a PDP-1 assembler written in PERL. The resulting
binary runs on a PDP-1 emulator written as a Java applet. The code is
extremely faithful to the original. There are only two changes. 1)The
spaceships have been made bigger and 2) The overall timing has been special
cased to deal with varying machine speeds. 
The sources are available in a subdirectory called "sources". 
The "a", "s", "d", "f" keys control one of the spaceships. The "k", "l",
";", "'" keys control the other. The controls are spin one way, spin the
other, thrust, and fire.


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