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     Interrupt 21h──Character-Oriented Functions
 
     Function     Name
 
     01h          Character Input with Echo
     02h          Character Output
     03h          Auxiliary Input
     04h          Auxiliary Output
     05h          Printer Output
     06h          Direct Console I/O
     07h          Unfiltered Character Input without Echo
     08h          Character Input without Echo
     09h          Display String
     0Ah          Buffered Keyboard Input
     0Bh          Check Input Status
     0Ch          Flush Input Buffer, Then Input
                                    -♦-