126  4.  ++-   

 .       
  ,         
,        . ,
   . 4.5,       
     ,      -
.        3,      -
.      2    ,   -
 ,        .  ,
      (  )   1
( 1   2).      .  -
     1   ,      -
 2   ,         
.         
          .    -
    ,    .

 			  	 32 (^^ ^^"	
							
	1						
							 		
						1	2			
	2									
										
										
										
										
										
										
										
	4				  		
							
							
 			IF~'?~ 1 I 4 [1^^^BiH		
					  		
	1						
						1	2			PC
	2									
									
							
							

. 4.5.   (   
 )   

    3,      
,        .  -
        . 
        
: FIFO (.  First In First Out, ..  ,  ),
RR (.  round-robin, .. )  - .  