71B: DISP, KEY$, and keyboard buffer

[Dave Britten]

That's good to know that SPACE is a safer way to resume when dealing with the default pause behavior of DISP. Thanks.

I have to imagine there's a better way to clear the screen than saving the current DELAY settings, changing to DELAY 0,0, calling DISP with no arguments, and restoring the previously saved DELAY. I'm open to LEX files here.