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INT 21 - Phar Lap 386/DOS-Extender - CALL REAL-MODE PROCEDURE
        AX = 250Eh
        EBX = 32-bit address of real-mode procedure to call
        ECX = number of two-byte words to copy from protected-mode stack
              to real-mode stack
Return: CF clear if successful
            all segment registers unchanged
            all general registers contain values set by real-mode procedure
            all other flags set as they were left by real-mode procedure
        CF set on error
            EAX = error code
                01h not enough real-mode stack space