Yeh, I remember the money that was lost when CDC insisted that PLATO games be ported to EVERY platform. By the time my Yahtzee knockoff "HiFive" was ready the window of good money had passed. Oh well. Fun thing is that "0hifive" on the Cyber1 PLATO system passed 10,000 games a month or so ago.

Then, of course, there was the old and gigantic audio disk player that also ran on compressed air. You could get that baby rocking, too.