AT&T MERLIN LEGEND Release 3.1 Maintenance And Troubleshooting Manual page 119

Processor Problems
!
CAUTION:
If releases are incompatible, pressing the hidden key will delete existing
programming. Before pressing the hidden key, make a backup of the
system programming. Use SPM or a PCMCIA translation card.
Console Display/Instructions
If the releases are incompatible, the following screen appears.
See SPM for instructions on converting the system programming before
upgrading to the new release.
If hidden key is pressed the following screen appears.
Additional Information
Pressing hidden key two times
_
deletes existing program.
Control Unit Problems
PC
5
5
4–29