Get info

        Entry:
          AX = CD07h
          ES:BX -> 32-byte buffer for info
        Return:
          AX = 0000h successful
               ES:BX buffer filled
             = 8001h buffer wrong size

        Format of info buffer:

        Offset  Size    Description
         00h    WORD    20h  (total size of buffer)
         02h    BYTE    suspend-once mode active if nonzero
         03h    BYTE    00h active, 01h suspended
         04h    BYTE    00h quiet, 01h verbose
         05h    BYTE    "Borland support" (allowing INT 21/AX=4B01h) on if nonzero
         06h 26 BYTEs   unused???