-2- 
Initial. 
program 
Inter i 
lace I 
disk link 
console 
printer 
Excb.data 
RCS1 
real-time 
JLpro.(pcaT'i„ 
is 
v:. 
,'iy c-3 
Absolute 
Relative 
orient. 
orient. 
console 
print erg 
Fig*1: System flow-chart of the AP/C-3 Analytical Plotter 
Th q new programs. 
The programming activities can be divided into additional 
programming for the existing system and programming 
for independent user oriexrtated systems. 
Additiona l prog rams for the e xisting„system* 
1 . Plffip of COMM ON a rea» 
Calling this program, the COMMON area of the real-time 
program is stored at a fixed area of the magnetic disk* 
So the orientation parameters of a relative or absolute 
orientated model are saved and the momentary work can 
be interrupted for using the computer for other purposes* 
Reloading of the stored parameters is done by setting 
the bit-switches at the 11 j >0 typewriter corresponding 
to the disk soctoraddress and by repeating the in- 
teriour orientation, 
For a longer storage the COMMON area can also be punched 
on paper tape*