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  Description:  Get Keyboard Flags      [PC] [AT] [PS/2]
 
  Returns the ROM BIOS flags byte that describes the state of the various
  keyboard toggles and shift keys.
 
  Input             Output
  ══════            ══════════════════════════════════
  AH=02H            AL=flags
                       Bit(s)  Significance (if set)
                       ══════  ═══════════════════════
                       7       Insert on
                       6       Caps Lock on
                       5       Num Lock on
                       4       Scroll Lock on
                       3       Alt key is down
                       2       Ctrl key is down
                       1       left Shift key is down
                       0       right Shift key is down
                                    -♦-