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.Nm device pt0 at scbus? 9.Sh DESCRIPTION 10The 11.Xr pt 12driver provides support for a 13SCSI processor type device. These are usually scanners and other 14devices using the SCSI link as a communication interface with device 15specific commands embedded in the data stream. 16.Pp 17A scsi adapter must be separately configured into the system 18before this driver can be used. 19.Pp 20This device only supports 21.Xr read 2 22and 23.Xr write 2 , 24and the general scsi ioctl calls. 25.Sh IOCTLS 26The 27.Nm 28driver has no ioctls of it's own but rather acts as a medium for the 29generic 30.Xr scsi 4 31ioctls. These are described in 32.Em sys/scsiio.h. 33.Sh FILES 34.Bl -tag -width /dev/pt -compact 35.It Pa /dev/pt[0-255] 36pt{x} is the 'xth' processor device. 37.El 38.Sh DIAGNOSTICS 39The 40.Em "at scbus?" 41is required in the config file for the configuration 42system to know this is a SCSI device and generate the appropriate 43tables. 44.Pp 45The 0 in 46.Em pt0 47in the configuration is required. 48This is a bug in 49.Xr config 8 . 50.Pp 51All 52.Xr scsi 4 53debug ioctls work on 54.Nm 55devices. 56.Sh SEE ALSO 57.Xr sd 4 58.Xr st 4 59.Xr cd 4 60.Xr ch 4 61.Xr su 4 62.Xr scsi 4 63.Sh HISTORY 64The 65.Nm 66driver appeared in FreeBSD 2.1 67