Int 1A Fn B404  - Intel Plug-and-play Auto-configuration - Get Available   [X]

   AX = B404h
   BX = bitmap of IRQs being used???

Return: CF clear if successful
       AX = 0000h
       BX = available for ISA??? (not(BXin) & A127h)
       CX = available for on-board I/O??? (not(BXin) & 40D8h)
       DX = available for PCI??? (either not(BXin) & 0E00h or 0000h)
   CF set on error
       AX = error code (0051h) (see #0939)

Note:  the various vector types have also been called "shareable",
     "unshareable", and "avoidable"

See Also: AX=B400h,INT 2F/AX=1684h/BX=304Ch