The USB drive is automounted as a device, not a file system. To see what device node was created just look at the dates of the device nodes. The most recently added nSX where n is the new device, and...
Most pen drives are formated FAT so the dosXX commands work. OS6 automatically mounts USB drives using the next available disk device nodes. So if you have one disk try dosdir /dev/dsk/1s1 or higher...
I had do the bottom half of How can I add and configure a parallel port card on my existing OpenServer 6.0.0 system? (http://wdb1.sco.com/kb/showta?taid=126151&qid=54410340&sid=562433097&pgnum=1) on...