From what I understand some of the addresses are unused. It is possible
that they change randomly and so are different every time the NVRAM is
read. I have used the TDS Floppy Tools also - to both read and write my own
TDS scope and it worked perfectly for me. I think you should have no
problem to boot the scope with a blank NVRAM - then you ought to be able to
do a restore from one of your backups. Alternatively, program the NVRAM
with the TL before booting and see what happens. You can always re-write
with the floppy. (Thanks flyte!) If you need an ACQ or NVRAM backup let us
know - I have the backups from my TDS754D (converted to TDS784D).

--Eric