10 - 
C. A further factor of complication comes through the 
real time operation requirement. 
For this reason the program branches alternately through 6 parts 
not required in real time. 
D. The subroutines 
not required in real tim e 
(interior orientation compute 
relative orientation compute 
absolute orientation compute) 
are written in an outside loop, 
In the Bendix-AP/C computer the program runs on the delay line 
memory if an automatic cycling, period is provided, at which inputs 
are collected. 
1. In the IBM 1130 this cycling has to be reached by executing 
an exchange data command by hardware every 32 msec, 
2. Until such time a wait state has to be programmed in. 
3. Since the servos are subject to certain performance limitations 
they have to be programmed accordingly: 
3a. A viewer servo will move 2 jJkm per bit with a maximum speed 
of 10 mm/sec and a maximum acceleration of 60 mm/sec^. 
3b. A plotting table servo will move 8yL4m per bit with a 
maximum speed of 32 nnn/sec and a maximum acceleration of 
2 
120 mm/sec . This is the case for all computers used. 
4. The IBM 1130 with a disk now permitted to program the orientation 
routines for storage , recall and restorag e on disk 
5. This gave shightly more flexibility for the program: 
a. ass ercbler programming was possible for the real time 
section. 
b. Fortran programming was possible for the orientation routines. 
c. An initializor program permits to load the real time program 
from disk into core with the appropriate constants ( number of 
scale transfer points, lens distortion coefficients,