Have you read the book Hackers, by Steve Levy? It was written about Sierra around the time you describe, and is really the best reference.
That said, it isn’t a very flattering portrayal. The author felt I was a villain for trying to profit from the sale of software, which he thought should be free. I’m portrayed as an evil capitalist exploiting a herde of creative geniouses. He also depicts what happens when you take a lot of kids in their 20s, and give them more money than common sense.
Overall though, it’s a very well written, and fun to read book, and does capture that time in history; all that was good about it, and all that wasn’t.