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)