1.Dd March 2, 1995 2.Dt PT 4 3.Os FreeBSD 4.Sh NAME 5.Nm pt 6.Nd SCSI processor type driver 7.Sh SYNOPSIS 8.Cd device pt0 at scbus? 9.Sh DESCRIPTION 10The 11.Nm 12driver provides support for a 13.Tn SCSI 14processor type device. These are usually scanners and other 15devices using the 16.Tn SCSI 17link as a communication interface with device 18specific commands embedded in the data stream. 19.Pp 20A 21.Tn SCSI 22adapter must be separately configured into the system 23before this driver can be used. 24.Pp 25This device only supports 26.Xr read 2 27and 28.Xr write 2 , 29and the generic 30.Tn SCSI 31.Xr ioctl 2 32calls. 33The 34.Sq Li at scbus? 35is required in the config file for the configuration 36system to know this is a SCSI device and generate the appropriate 37tables. 38.Pp 39The 40.Sq Li 0 41in 42.Sq Li pt0 43in the configuration is required. 44This is a deficiency in 45.Xr config 8 . 46.Sh IOCTLS 47The 48.Nm 49driver has no 50.Fn ioctl 51commands of its own but rather acts as a medium for the 52generic 53.Xr scsi 4 54commands. These are described in 55.Aq Pa sys/scsiio.h . 56All 57.Xr scsi 4 58debug ioctls work on 59.Nm 60devices. 61.Sh FILES 62.Bl -tag -width /dev/ptQQQ -compact 63.It Pa /dev/pt Ns Ar N 64the 65.No Ar N Ns th processor device. 66.El 67.Sh SEE ALSO 68.Xr scsi 4 69.Sh HISTORY 70The 71.Nm 72driver appeared in 73.Fx 2.1 . 74