This Digital Antiquarian's blog post about Greenberg's contribution to Wizardry:
https://www.filfre.net/2012/03/making-wizardry/
Good article and really is a nice history lesson about way back. The only fault is the digs at Gygax and TSR. The article states quite a few times that:
After a couple of days, he [Greenberg] says that, “I was getting tired of these same games. I was bored and complained about my boredom.” A friend suggested offhand that he go put Dungeons and Dragons on a computer.
So if Gygax sued him for hitting a little too close to home, its understandable. Also just underscores how important D&D was in the early days of computing, with Garriott, Greenberg, Fargo, Woodhead, Spector, even Gygax himself having played D&D.
Kind of interesting to think how things would have panned out if TSR had sued more.