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INT 1Ah,  00h (0)        Read System-Timer Time Counter                   all
INT 1Ah,  01h (1)        Set System-Timer Time Counter                    all
INT 1Ah,  02h (2)        Read Real-Time Clock Time                       many
INT 1Ah,  03h (3)        Set Real-Time Clock Time                        many
INT 1Ah,  04h (4)        Read Real-Time Clock Date                       many
INT 1Ah,  05h (5)        Set Real-Time Clock Date                        many
INT 1Ah,  06h (6)        Set Real-Time Clock Alarm                       many
INT 1Ah,  07h (7)        Reset Real-Time Clock Alarm                     many
INT 1Ah,  08h (8)        Set Clock-Activated Power-On Mode        Convertible
INT 1Ah,  09h (9)        Read Clock Alarm Time and Status         Convertible
INT 1Ah,  0Ah (10)       Read System-Timer Day Counter               some XTs
INT 1Ah,  0Bh (11)       Set System-Timer Day Counter                some XTs
INT 1Ah,  80h (128)      Set Up Sound Multiplexer                        PCjr