The old B.B. Russell school building in Brockton, MA, prior to its renovation this month (it’s been closed for years, but will be reopened this fall), used to have a REALLY OLD Edwards system from the 1940s or 1950s. IDK if it was coded or not, but I know that prior to the renovations they had no real alarm signals: it was just tied into the intercom system and an alarm tone would sound when the system was activated.
That ancient Edwards system was replaced early this month with a Notifier NFS2-3030 voice-evacuation system with SpectrAlert Advance speaker/strobes, NBG-12LX pulls, FSP-851 smoke detectors on the more conical-shaped bases, and I also saw a backbox where an annunciator will be going (probably either the newer large Notifier annunciators or an FDU-80.)