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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