INTxx.yy is a "shorthand" notation people use to indicate an INT xx with 
subfunction yy.  The yy is usually put into one of the CPU registers before the 
call (AH in many cases).  In addition, the xx and yy are assumed to be hex.

Example:
  INT 21.4C would be coded as:
    MOV AH,4Ch
    INT 21h


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