Well, the 8-bits, Lisa, Macintosh, and Windows would have still been with us. So, I guess AT&T Sys V and BSD would have not happened which gets rid of Sun and makes one wonder what Dr. Tanenbaum and Mr. Torvalds would have worked on. I guess the second vector would have been what Steve Jobs would have built after leaving Apple (NeXTSTEP, the ultimate user friendly LISP machine?!?). Maybe Dylan would have worked in its infix form.
I would imagine that intelligent people would have worked at getting the same problems solved in a different form.
[edit] Instruction Sets from Intel, IBM, MIPS, Motorola would have been really different. Personally, I wanted the Forth machines to rule :)
Actually they were. The Interface Builder was sold also for the TI Lisp Machine - the TI MicroExplorer running in a Mac. Expertelligence developed the access to the Macintosh Toolbox for TI and also ported the Interface Builder to the MicroExplorer. Thus you could develop Mac-style user interfaces on the TI Microexplorer, including using the Interface Builder, which ran on the Lisp Machine and talked to the Mac for the UI display/interaction.
Here is a video which shows it running on a TI Micro Explorer, a Nubus Board in a Mac II.
I would imagine that intelligent people would have worked at getting the same problems solved in a different form.
[edit] Instruction Sets from Intel, IBM, MIPS, Motorola would have been really different. Personally, I wanted the Forth machines to rule :)