5 |
WRITING A DRIVER
by the driver
For example, if a user of the SCSI interface only has disk applications, only a SCSI disk driver for the particular operating system may need to be written. If the rules for multiple callers are used, then at a later time, a SCSI tape driver for the same operating system may be added without affecting the old disk driver (assuming that the tape driver returns are vectored through a different vector than the SCSI disk driver). Refer to the Interface Rules for Multiple Callers section in this chapter for details.
