5.0 Rulebook
From AmtWiki
The rulebook in play around 1990.
Main differences between 5.0 and 6.0 were that back then, Bards didn't have a regular spell list, instead had a bunch of non-magical abilities. They also had to pay spell points for their weapons, which was a major change for them, as before they could take whatever they wanted without reducing their spellcasting.
This was the last time any classes had guildmaster perks.