Mention of the Blit reminds me of the old Scion SuperScreen.
Not sure if there were any production versions sold, but I
found a price and some minimal specs on an archived page:
http://bitsavers.informatik.uni-stuttgart.de/pdf/scion/Scion_Price_List_Sep…
640k! Now where have I seen that number before... :-)
The SS was indeed 68k-based; I watched one of Chuck Reiger's grad
students (Richard something, cannot recall his last name) work on
some assembly code for doing some of the windows on it.
Chris