AP/C PROG 
MOD. 3 
- O0 - 
RAM STRUCTURE 
  
  
Initia 
lizer 
  
  
  
  
  
  
  
select 
Input 
Handwheels X,y,2 
Veltropolo v,a 
  
  
x 
Ineremental A «' 
  
calcul 
x y 
ate 
  
  
Exchan 
Data 
  
ge Interface 
  
  
  
  
  
| 
  
  
  
Wait 
clocked 
  
  
SU[4 189d —> 
  
  
  
Interrupt 
  
Xyz x'y!X"y Xqyq 
etc. 
32 msec 
  
  
  
i 
  
orientation compute — 
: 
  
  
  
  
  
  
  
  
Status 1/0 
routine select 
  
  
  
  
  
  
  
  
interrupt 
ZZ 
  
i 
  
  
  
  
  
  
inter- 
rupt complete 
  
4 YA 
  
  
  
low priority Start 
inter- 
rupt 
  
  
  
  
1) 
  
  
  
  
  
7) complete 
  
medium priority Start 
  
  
LA LI 
  
/ 
/ 
| | Y D unu unblock 
778877 
  
high priority 
  
  
  
Start / oe complete 
block unblock 
- SCHEDULING WITH MULTIPROGRAMMING 
VIA 
PRIORITY