Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
Int 10h Function 12h Subfunction 10h
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  Interrupt:   10h     Function:   12h     Subfunction:   10h
 
  Title:       Get Configuration Information
 
  See also:    Get Video Mode, Get Functionality/State Information
 
  Description:                                               [EGA] [VGA]
 
     Obtains configuration information for the active video subsystem.
 
     Input        Output
 
     AH = 12h     BH = Display type
     BL = 10h        = 0h (if color display)
                     = 1h (if monochrome display)
                  BL = Memory installed on EGA board
                     = 00h (if 64K)
                     = 01h (if 128K)
                     = 03h (if 256K)
                  CH = Feature bits
                  CL = Switch setting
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