The first commercially available analytical plotter, the 
O.M.I.-Bendix AP/C was shown at the Lisbon Congress in 1964. 
Because of its delay line memory it was extremely difficult 
to program. 
At the Ottawa Congress it was replaced by the AP/C-5 by O.M.I. 
with an IBM 1130 computer with considerable potential. This 
opened the possibility în the civilian sector for program 
development. Because of adequate disk storage new uses of 
analytical plotters became implementable. 
It should of course be remembered that military devices and that 
image correlation systems based on analytical plotter principles 
already offered the same possibilities, only at extremely high 
cost. 
The recent models of analytical plotters, of which 5 are on 
display at the exhibit and of which 2 further ones may be studied 
by pamphlet information obtainable at the exhibit, generally 
offer vastly improved computer capabilities, suitable for further 
software implementations. Paired with their 4 image drives they 
offer possibilities for semi-automatic operation by driving to 
points by ground-model - or image coordinates, 1f appropriately 
programmed. 
Due to only two image coordinate controls by step motors the 
Galileo digital stereocartograph offers a more limited but very 
cost competitive version of an analytical instrument; one could 
say it is a "second order analytical instrument”. 
The Zeiss Stereocord constitutes a "third order"-type analytical 
instrument. y-Parallax must be removed manually. 
A hardware comparison is shown in the following summary: