Option Right.                Control

Left Arrow Right.         Control

To further summarize my inquiry, I'm wondering:

 o If there was any physical reason for the placement of the keys on the early LISP keyboards?  Perhaps frequency of that particular input as a key in editing LISP code?

 o Is there any key mapping of these LISP machine keyboards to Emacs functions?  (Emacs had been around at that time)

 o Did the Emacs functional keybindings (M-x) for instance change over time?  For instance did the early LISP keyboards Meta key + x, correspond to M-x of was it different?

 o Has anyone created a similar physical mapping of the iMac Bluetooth keyboard with above in mind from a physical to Emacs functional perspective?  

I also noted that there are arrow keys above g,h,k,l.  For instance, were these used to move the cursor?  If so, I would argue they are better placement then modern arrow keys and/or Alt-n Alt-p, for cursor movement.   I'm also suspicious that the Space Cadet ALT MODE which is close to the iMac TAB may be the original mapping to Meta functionality because it corresponds easily to the pinky figure.

Finally, does someone have one of these keyboards because I would love to try one out. :)