The smarter way for TI to market and grade segment would have been following IBM's supercomputing footsteps and firmware-locking feature sets. So one could att

The smarter way for TI to market and grade segment would have been following IBM's supercomputing footsteps and firmware-locking feature sets. So one could attest that a calculator was currently running the "Grade 6-US" feature set standard. But I imagine in the 1990s doing so at consumer device scale was dicier. I.e. where would upgrades be applied?