Function  01h     Get Keyboard Input 

        Waits for char at STDIN (if nescessary), echoes to STDOUT

entry   AH      01h 
return  AL      ASCII character from STDIN (8 bits) 
note 1) Checks char for Ctrl-C, if char is Ctrl-C, executes Int\23.
     2) For function call 06h, extended ASCII codes require two function calls.
	The first call returns 00h as an indicator that the next call will be
	an extended ASCII code.
     3) Input and output are redirectable. If redirected, there is no way to  
	detect EOF. Redirection can be detected using Int\21f\44 -redirection


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