I was lucky enough to finally find a PCjr. today at the local thrift and picked up also a book of the type I usually disdain, "Introduction to Personal Computers" by Katherine Murray from Que/1990. In looking thru the book which is an excellent primer to newby collectors (it covers basics for DOS, Mac, AppleGS) I was struck again by the similarities of most of the GUIs. It had figs. from Mac, GS, and PCs. I'd never seen before the GS desktop. What struck me is the basic similarity. Having develloped my eye-teeth with Atari STs, altho I had a Pet and PCs before that, I am well acquainted with the GEM desktop. Despite the claims of Apple and the Palo Alto connection and the suit that wound up GEM on PCs and resulted in Windblows, I am unclear as to what the DI relationship was, why Atari was allowed to continue with it's GEM desktop, altho they stopped at GEM II, why GEOS on the C64 (C64 users compare before flaming me) and a multitude of systems and programs such as Ventura Publisher and PC Tools were allowed to continue with this supposed violation of supposed Apple copyright. DI of course continued for years issuing GEM-like GUIs and they are still available. ciao larry BTW Tim Olmsteads Unofficial CP/M home page has a lot of material. lwalker(a)interlog.com Let us know of your upcoming computer events for our Events Page. t3c(a)xoommail.com Vintage Computer Collectors List and info http://members.xoom.com/T3C