Int 15 Fn D804  - Eisa System ROM - Read Physical Slot                     [X]

   AX = D804h
   CL = slot number (including embedded and virtual)

Return: CF clear if successful
       AH = 00h
   CF set on error
       AH = error code
       80h invalid slot number
       83h empty slot
       86h invalid BIOS-FW function call
   SI:DI = 4-byte compressed ID (DI = bytes 0&1, SI = bytes 2&3)

Note:  call with AL=84h if using 32-bit CS addressing mode instead of 16-bit

See Also: AX=D800h