Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
Int 10h Function 1Bh
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  Interrupt:   10h     Function:   1Bh
 
  Title:       Get Functionality/State Information
 
  See also:    Get Configuration Information
 
  Description:                                                    [PS/2]
 
     Obtains information about the current display mode, as well as a
     pointer to a table describing the characteristics and capabilities
     of the video adapter and monitor.
 
     Input                                        Output
 
     AH = 1Bh                                     If function supported
     BX = Implementation type (always 00h)          AL = 1Bh
     ES:DI = segment:offset of 64-byte buffer     And information placed
                                                  in caller's buffer
                                    -♦-