## Storage Device Driver Reference

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### ASPI and OS/2 2.x

The device driver architecture for OS/2 2.x is divided into several basic layers. The Device Manager Drivers (DMD) receive requests from the file systems and other device drivers. These requests are passed on to an Adapter Device Driver (ADD), which then sends the appropriate command to the host adapter.

ASPI for OS/2 2.x is a translation layer, and has been implemented as a device driver (OS2ASPI.DMD). An application can send SRBs to any SCSI adapter which has an ADD installed. It is no longer possible to set host adapter parameters because OS2ASPI has no direct control over the host adapter. [Artwork not shown]