[finin]

I'd guess that he composed that message on a Lisp Machine and not a CRT, e.g., something like this: http://s7.computerhistory.org/is/image/CHM/500004885-03-01?

[acqq]

It also has a CRT (http://en.wikipedia.org/wiki/Cathode_ray_tube)

[finin]

Yes, the lisp machnes used CRTs, but they did not look like the classic terminals from that era. IIRC they had much higher resolution and were black and white.