TMP800: co-exist with TMP6400

Could the TMP6400 and the TMP800 co-exist within a system and controlled by the same control host server and application?

Yes. Note that the application must be aware of the difference in the number of hardware resources between TMP6400 and TMP800. Also, the TMP800 is not equipped with TMS ports, so it cannot be used with the TMP6400-TMS.