INT 21,C - Clear Keyboard Buffer and Invoke Keyboard Function

AH = 0C

AL = 01, 06, 07, 08 or 0A (INT 21 input functions)

on return:

see return values from INT 21,AL where AL is 1, 6, 7, 8 or A

- main function is to clear the input buffer and call INT 21h with

the specified function (in AL)

- see ~INT 21,1~, ~INT 21,6~, ~INT 21,7~, ~INT 21,8~ & ~INT 21,A~