Hi,
I was playing with x= and x<> in program and run modes and had no problem entering tests in program mode, comparing to two-digit register numbers or to the values zero or one. However in run mode, while tests against registers returns the expected "true" or "false", the same tests against zero or one locks the machine up hard, requiring the batteries to be pulled. I am running version 838 and tested it on both the 20b and 30b.
Jake