Device drivers that need to access ASPIN, must determine the address of the ASPI entry point through an OS/2 Attach DevHelp call as follows:

   SCSIMGR$                                DB              'SCSIMGR$',0
   Return_Data_Buffer                      DB              12      DUP     (?)

                                           MOV             BX,OFFSET SCSIMGR
                                           MOV             DI,OFFSET Return_Data_Buffer
                                           MOV             DL,DevHlp_AttachDD

                                           CALL            [DevHlp]

On return from the Attach DevHelp call, a clear-carry flag indicates that the SCSI manager SCSIMGR$ was found and the return data is valid. A set-carry flag indicates that the SCSI manager was not found. The return data buffer has the following format:

        ASPI_Real       DW              Real Mode offset of ASPI entry point
                        DW              Real Mode CS segment of ASPI entry point
        Real_DS         DW              Real Mode DS of ASPI entry point
        ASPI_Prot       DW              Protected Mode offset of ASPI entry point
                        DW              Protected Mode CS selector of ASPI entry point
        Prot_DS         DW              Protected Mode DS of ASPI entry point

Note: ASPI_Real and Real_DS are used by OS/2 1.x only. Information returned under OS/2 2.x is irrelevant.

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