Int 15 Fn D801  - Eisa System ROM - Read Function Configuration Informati  [X]

   AX = D801h
   CH = function number to read
   CL = slot number (including embedded and virtual)
   DS:SI -> 320-byte buffer for standard configuration data block

Return: CF clear if successful
       AH = 00h
       DS:SI buffer filled
   CF set on error
       AH = error code
       80h invalid slot number
       81h invalid function number
       82h EISA CMOS corrupt
       83h empty slot
       86h invalid BIOS-FW function call
       87h invalid system configuration
   BX destroyed

Note:  call with AL=81h if using 32-bit CS addressing mode instead of 16-bit