Lyle Bickley wrote:
  I had often run D.E. WREGE's version of Spacewar!
on my PDP-12. But
 when I tried to run it on my PDP-8/E with a VC8/E and DEC VT01 (Tek
 611), I would get flashing artifacts on the screen in addition to the
 normal display.
 [...]
 BTW: Slower displays, such as the VT01/Tek611/Tek613, do NOT need a
 clock to slow down Spacewar to an appropriate speed. 
You've got me confused.  I thought you said that the VT01/Tek611 was
where you had the problem.
I used to run it on a LAB-8/e using a VR14 monitor, and didn't observe
the problem, but I think the VR14 is pretty slow.
Eric