I actually had a need to do TVM so I thought I would try out the wp34s library routine.
I believe it is broken by the fact that LBL 00 is used twice in segment 1, step 15 for TVM and 368 as part of the vector functions.
It doesn't seem to matter if I load that segment into RAM or try to run it from the XROM.
I can get it work if I delete step 368 after the PRCL 1