From the introduction:
"These aren't the complete rules to Ysgarth. The minirules are the most basic version of the rules, with enough information to play a limited game of Ysgarth, but without some of the details and refinements. Complete mechanics can be found in the full version of the 6th edition rules."
A free eight-page pamphlet (two sheets of paper folded over each other, but not stapled), distributed at game conventions. Four pages described basic versions of Ysgarth's rules for character generation, combat, and spellcasting. The remaining four pages are a product catalog for Ragnarok Enterprises.
The game's designer, David Nalle, was also posting the non-catalog portion of the minirules online (as a plaintext file without art) as early as 1995.
The minirules appear to have been revised fairly often. Version 2.5 is dated 1993, Version 4 is dated 1994, Version 5.2 is dated 1995, and Version 6 is dated 1998.