Annotated Source: Zork 2

Weirdly, nothing ever includes this file. See zork.zil.

The I-LANTERN routine is definitely part of the game file. So we know the compiler read this file in. But it’s not obvious how.

This routine sits in the timers table. When it fires, it prints a “lantern has gotten dimmer” message and re-queues itself for the next dimming stage. (Until the lantern goes out entirely, of course.) The messages themselves (and their durations) are found in LAMP-TABLE.