This chapter contains a description of:

• CD-ROM device management
  
• SCSI and Non-SCSI adapter drivers
  
• Command support

The following figure illustrates the layered CD-ROM Device Management structure in the OS/2 operating system.

 ┌────────────────────────────────────────────────────────┐ │                 CD-ROM Device Manager                  │
 │                   (OS/2 CDROM.DMD)                     │
 └────────────────────────────────────────────────────────┘
                     SCSI-2 Commands           
                  │                             
                  │                     ┌─────────────────┐
                  │                     │ SCSI-2 Emulator │
                  │                     │ Filter          │
                                       └─────────────────┘
           ┌────────────────────────┐       Vendor Unique
                                          SCSI-1 Commands
 ┌──────────────────────┐       ┌───────────────────────┐
 │Non-SCSI CD-ROM       │       │ SCSI Bus              │
 │Adapter Device Driver │       │ Adapter Device Driver │
 └─────────┬────────────┘       └───────────┬───────────┘
                                           
  Non-SCSI CD-ROM                 SCSI Adapter
  Adapter  │                                │
                                           
  CD-ROM Drive                    CD-ROM Drive