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-83h,86h,87h) (see #0463)
   BX destroyed

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