A few test scripts included in the source kit include: (dated, not used or maintained)

dta  tests async serial lines.
dtc  tests CD-ROM w/RRD test disc.
dtciot  tests IOT CD-ROM test disc. (TCL)
dtf  tests floppy diskettes.
dtr  reads RRD test disc patterns.
dts  gathers disk performance data.
dtt  gathers tape performance data.
dtw  writes RRD test disc patterns. 
