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  Function 07H (decimal 7) waits for character input from the standard input
  device and returns it in the AL register when available. It does not echo
  input to the display screen, and it does not recognize Ctrl-C as a
  keyboard break character.

  Function 07H works in the same way as function 01H: ASCII character key
  actions are returned as single bytes in AL and are immediately reported by
  this function. The non-ASCII function keystrokes (see page 135) generate
  2 bytes, which must be obtained through two consecutive calls to function
  07H.

  Compare this function with functions 01H, 06H, and 08H. If you want to
  use this function but don't want to wait when input is not ready, see
  function 0BH, which reports whether or not input is ready. See function
  0CH for a variation of this function.