Adapter device drivers provide a uniform software interface to the hardware devices they manage. A device driver's external interface is defined in this reference.

Adapter device drivers for the following industry-standard interfaces are included in the OS/2 2.0 (and later) product:

┌─────────────────┬───────────────────────────────────────────┐
│Device Driver    │Supported Devices                          │
├─────────────────┼───────────────────────────────────────────┤
│IBM1S506.ADD     │                                           │
├─────────────────┼───────────────────────────────────────────┤
│IBM1FLPY.ADD     │ISA removable media drives                 │
├─────────────────┼───────────────────────────────────────────┤
│IBM2ADSK.ADD     │ABIOS fixed drives                         │
├─────────────────┼───────────────────────────────────────────┤
│IBM2SCSI.ADD     │ABIOS SCSI adapters                        │
├─────────────────┼───────────────────────────────────────────┤
│IBM2FLPY.ADD     │ABIOS removable media drives               │
├─────────────────┼───────────────────────────────────────────┤
│IBMINT13.I13     │INT 13H BIOS DASD devices                  │
└─────────────────┴───────────────────────────────────────────┘

Additional adapter device drivers for other OEM interfaces might be included in the OS/2 operating system.