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MATRA OPTIC 
drafting table during compilation. A second foot switch trans- 
mits point co-ordinates in the model to the computer. 
The control console also contains adjustments for setting the 
brightness and focus of the two photographic images on the rear 
projection screen. 
. Electronics and data processing compartments: 
Situated to the right of the operator under the drawing table, 
the electronics and data processing compartments are accessible 
through doors on the right side. The electronics assembly is 
separated into two groups: slaving, and acquisition. An input/ 
output coupler in the computer assures interface between elec- 
tronics and data processing (TTL logic). The electronics as- 
sembly consists of six identical systems from a servo point of 
view. Two correspond to the two travel axes X and Y of each 
photo stage, and two are for the X and Y axes of the drawing 
table. The data processing compartment contains a 32K l6bit 
750n/sec base time computer equipped with a holding battery. 
The main functions of the computer are: 
- responding to data output by the electronics, i.e. orders 
issued by the operator and transmitted from the ball (X,Y) and 
the drum (Z2), activation of mechanical brakes and electrical 
limit switches, functions requested by operator (point trans- 
mission, drawing, etc...) 
- elaboration and transmission of piloting orders to electronics 
controlling photo stages and drawing table. 
- dialogue with operator via display console, and 
- data recording. 
The basic logic unit is modular and may be broken down as 
follows: 
a) preparatory phase: 
. total or partial initializing (depending on whether work is 
is new or renewed) 
. forming the plastic image 
. tilting and scaling, and 
. calculations by various operators. 
B. Graphical Version 
The TRASTER drawing table is optional and may be added later. It 
is situated to the right of the operator above the electronics and 
data processing compartments. The very large area of the table is 
directly accessible from the operator's seat. The useful area of 
l.l by 1.4m permits making very large scale drawings. The glass 
light table facilitates plotting and tracing on material to be 
scribed. Both arms of the table's co-ordinatograph are of granite 
and travel is provided by a system of tape drives. The X-Y carriage 
may be fitted with a TV camera to display on the TRASTER console the 
area being plotted without requiring that the operator move.