Speaking of which, I recently made a VAXstation 100 emulator. Jim
Gettys caught wind of it and says he has an archive of old X versions,
and he'd like to see them run on the emulator. So far, the oldest
available online is X10R3.
Quick recap of X prehistory: Stanford's VGTS on V -> W on V -> W ported
to VS100 at DEC -> W adopted by CLU group at MIT -> W hacked into X ->
X adpoted by Project Athena -> X adopted by DEC and workstation vendors.