Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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Int 15h Function 88h
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  Interrupt:   15h     Function:   88h
 
  Title:       Get Extended Memory Size
 
  Description:                                               [AT] [PS/2]
 
     Returns the amount of extended memory installed in the system.
 
     Input        Output
 
     AH = 88h     AX = Amount of extended memory
                       (in kilobytes)
                                    -♦-