And I quote...
--SNIP---
"The microcomputer may be any one of several commercially available products, such as the Intel.TM. 86286, 86386 or 86486 processors, Motorola Corporation's 68030 or 68040 processors, as well as several others. If the workstation is to be battery powered, then low voltage (3V) low-power microprocessors should be used. The microcomputer/controller 44 may be embodied by several means."
--SNIP--
It also references Newton, on the same page.