The screen is laid out so that the full rule of the 
automaton
is displayed, the corresponding totalistic rule, and the semitotalistic
rule. This latter is obtained by summing the diagonal cells to get one
coordinate, the antidiagonal cells to get the other. There is little
sense to separating a ``central'' cell from the remainder with this
kind of geometry. If this is all done in text mode, enough space
remains to display the traditional help panel on the right hand side of
the screen.
Figure: CAMEX
2-D (4,1/2) menu
There is enough space in the data segment of the INTEL 8086 to
accommodate a very rudimentary de Bruijn diagram calculation for
automata along with the data pertaining to the main program
and to the 
option itself. The strips of width 3 which can be
computed barely suffice to establish the existence of de Bruijn
diagrams, but there wouldn't be enough space for four cell strips even
if a separate submenu were allocated for the purpose.
Nevertheless the de Bruijn option occupies a separate graphics mode
screen, whose characteristics and operation follow the description
given in the section on de Bruijn diagrams for 
Moore automata.