Homebrew DRO differences ?

to:CAD_CAM_EDM_DRO@onelist.com

The discussions on what is done on what board, and if they are smart or
dumb prompts me to ask:
Whats the difference between the Tom K./ Dan M. DRO board method and the
Steve Lindsay system that used the com port and transistors?
In other words, since the end result is a DRO on the monitor, how do
the two differ on where the work is done, and what are the pros/cons of
each?

Brad Heuver
Mechanical Sub-Systems fax 734-523-6052
734-52-33480 bheuver@...