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Driver migration is the process of converting current 68K drivers to native driver equivalents.
Resources of type 'DRVR' in Mac OS are used to solve a broad variety of problems. Some 'DRVR' resources drive devices as part of the I/O subsytem. For example, SCSI disk device drivers use the SCSI Manager's I/O interface to access disks on the SCSI bus. These I/O manager-based resources need not migrate to the new services and run-time model. However, the 'DRVR' resources that control physical devices attached to a PCI bus must operate in a new, more restrictive environment.
This section covers changes to existing driver mechanisms, as well as the replacement calls. Please note that these are guidelines; for exact calling sequences and parameter descriptions you must refer to the chapters that cover each of the new routines.