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 INT 1Ah, 00h    Get time of day
 INT 1Ah, 01h    Set time of day
 INT 1Ah, 02h    Read real time clock                      (AT,XT286,CONV,PS)
 INT 1Ah, 03h    Set real time clock                       (AT,XT286,CONV,PS)
 INT 1Ah, 04h    Read date from real time clock            (AT,XT286,CONV,PS)
 INT 1Ah, 05h    Set date in real time clock               (AT,XT286,CONV,PS)
 INT 1Ah, 06h    Set alarm                                 (AT,XT286,CONV,PS)
 INT 1Ah, 07h    Reset alarm                               (AT,XT286,CONV,PS)
 INT 1Ah, 08h    Set RTC activated power on mode                (CONVERTIBLE)
 INT 1Ah, 09h    Read RTC alarm time and status                   (CONV,PS30)
 INT 1Ah, 0Ah    Read system-timer day counter                       (XT2,PS)
 INT 1Ah, 0Bh    Set system-timer day counter                        (XT2,PS)
 INT 1Ah, 80h    Set up sound multiplexor                         (PCjr ONLY)