struc InitRequest               ; Device-Driver function 00h
 irLength       db ?            ; Length of structure, in bytes
 irUnit         db ?            ; Not used
 irFunction     db ?            ; Function number (00h)
 irStatus       dw ?            ; Status
 irReserved     db 8 dup (?)    ; Reserved
 irUnits        db ?            ; OUTPUT: number of units
 irEndAddress   dd ?            ; INPUT:  end available driver memory
                                ; OUTPUT: end resident code
 irParamAddress dd ?            ; INPUT:  addr CONFIG.SYS device= line
                                ; OUTPUT: addr BPB pointer array
 irDriveNumber  db ?            ; INPUT:  first drive number
 irMessageFlag  dw ?            ; OUTPUT: error-message flag
ends                            ; = 25d bytes