Online HelpPC 2.10      Quick Reference Utility     Copyright 1991 David Jurgens

 
            INT 70 - Real Time Clock Interrupt  (XT 286,AT,PS/2)            
                                                                                
                                                                                
        - called 1024 times per second for periodic and alarm functions         
        - decrements a DWORD counter by 976µ sec (1/1024)                       
        - when DWORD reaches zero, bit 7 of designated wait flag is set         
        - if alarm was enabled by  INT 1A,6,  INT 4A is called when             
          counter reaches zero to activate alarm handler                        
        - not available in model 30 PS/2                                        
                                                                                
                                                                                
        - see   INT 15,83   INT 15,86                                           
                                                                                
 

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