You can submit an Instrument Driver Request at:
http://zone.ni.com/idnet97.nsf/instrumentdriverrequest/
We develop drivers based on demand and instrument availability. We would be potentially interested in creating a driver for the Tektronix TLA series of instruments. Would you be able to loan us a TLA for the duration of our development effort?
You may find the Instrument I/O Assistant (http://www.ni.com/labview/express_demos.htm) valuable for controlling and communicating with instruments when drivers do not exist.
Jason Hobbs
Instrument Drivers
