The Complete Guide to AD&D Technology

From the introduction:

This informative guide is to give a [Dungeon Master] some rules for introducing technology in an AD&D game. The consequences of doing so is not discussed in this guide because it is discussed thoroughly in the articles that are listed in the "Suggested Readings" section.

Since players shouldn't automatically know how a highly technical item works immediately, "Figuring Out Techno-Items" gives a few systems to allow characters to analyze any technical item.

This guide will take you through various new weapons starting with a modified hand crossbow to a laser gun.