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 Int 1Ah, 00h            Read System-Timer Time Counter                   all
 Int 1Ah, 01h            Set System-Timer Time Counter                    all
 Int 1Ah, 02h            Read Real-Time Clock Time                       many
 Int 1Ah, 03h            Set Real-Time Clock Time                        many
 Int 1Ah, 04h            Read Real-Time Clock Date                       many
 Int 1Ah, 05h            Set Real-Time Clock Date                        many
 Int 1Ah, 06h            Set Real-Time Clock Alarm                       many
 Int 1Ah, 07h            Reset Real-Time Clock Alarm                     many
 Int 1Ah, 08h            Set Clock-Activated Power-On Mode        Convertible
 Int 1Ah, 09h            Read Clock Alarm Time and Status         Convertible
 Int 1Ah, 0Ah            Read System-Timer Day Counter               some XTs
 Int 1Ah, 0Bh            Set System-Timer Day Counter                some XTs
 Int 1Ah, 80h            Set Up Sound Multiplexer                        PCjr