I think it is possible that different builds may respond differently, one builder may have implemented an alarm in the ladder, the other maybe not, given the G122.3 diagnostic bit on mine is at 0 (harware data protect key) [i can post the maintenance manual if needed and allowed] should result in an alarm when i try to write a new program. Yet it doesn't, not sure but maybe it is also older, monochrome crt instead of colour (that is just my theory, i am new to fanucs after all).
Btw the memory must have been wiped either by the tech or the previous owner, there are not programs in the library.