Get me a QBus framebuffer, and I'll port it to the
PDP11. If not Doom,
then at least Wolfenstein 3D...
Actually, there were some rather nice graphics systems for the PDP11. For
example the I2S Model 70 had a resolution of 515*512 points with, IIRC,
24 bit colour. And some local processing built-in (I can provide a lot
more detials if you want them, but I would haev to dig out the manuals).
I suspect you could play most games on that sort of display...
-tony