X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 67 - virtual control program interface

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INT 67 - Virtual Control Program Interface - GET NUMBER OF FREE 4K PAGES
        AX = DE03h
Return: AH = 00h  successful
            EDX = number of free 4K pages
        AH nonzero: failed
Notes:  returns total number of pages available to ALL tasks in system
        also available in protected mode by calling the protected-mode VCPI
          entry point
SeeAlso: AX=DE04h

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