Running into an interesting problem here:
I can add the tape with "mkdev tape" the system appears to see it wwith "hwconfig -hc" however a 'tape status /dev/rStp0' says 'no device found',
checked the configuration files in 'etc' all appear to be correct.
the unit were working?? or it's a new installation, cause it could be wrong configurated, should know which scsi adapter, its LUN number, BUS and ID to correct configure it, ny device attacjed to a scsi card must be configured with the correct driver for example if it's an ultra 320 scsi card you must use ad320 driver, please give more information, additionally should the unit display it's information on post ? at start up of equipment
The hwconfig command only displays what the driver configiration is, is has no relation to what the hardware actually is (which is one of the reasons why SCO never bothered putting the command into SCO6). You can configure a tape drive and have it show up in the hwconfig command without ever having a tape drive physically installed on to the system.
Recheck your hardware's address and configuring and redo your mkdev tape.