aa) In order to cycle real time computations every/sec (AP/C) 
*• a ver Y small memory (256 word per delay line) 
2. they had to be time optimized in programming due to 
the access time bein g dependen t on storage location 
3. they had to be machine programmed since no compiler 
was generally available (except for an assembler for the 
AP/C computer written at UNB) 
4. they had to be programmed in fixed point to save 
computing time 
ab) The. AS-1 1 -A due to its fast real time requirement for 
automation (every 1/100 sec) had to utilize a 
digital differential analyzer- computer 
to control the outgoing bit rates to the servos 
depending on the incoming bit rates from the encoders. 
For the conversion a second computer, interfaced with 
the DDA was used /5/. 
The AS-11-A due to the special.requirement to evaluate 
panoramic photography was equipped with additional computer 
controls to permit stereoscopic viewing with a rotable 
optical zoom system. 
b) the next stage of the development was of course to replace 
the delay line computers by second generation computers. 
ba) This was done for the AS-11-A using a BX-272 computer 
making it the AS-11-A1. 
bb) The standard AP/C replaced the Bendix computer by an 
IBM 1130/7/.