Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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Int 12h
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  Interrupt:   12h
 
  Title:       Get Conventional Memory Size
 
  See also:    Configuration Data Memory
 
  Description:                                          [PC] [AT] [PS/2]
 
     Returns the amount of conventional memory available for use by
     MS-DOS and application programs.
 
     Input       Output
 
     None        AX = Memory size (in kilobytes)
                                    -♦-