I mentioned this on my defunct blog many years ago, but early 90s TSR experimented with Ascending AC for d20 in Gamma World. It was released in 1992. This is 8 years before WotC took over and went on to make 3rd edition D&D.

Waynes Books recently took pictures comparing pages from the 1992 Gamma World and the 2001 D&D Player's Handbook.

1992 Gamma World uses THAC which is equivalent to 2001 D&D BAB.

Buck Rogers XXVc & Gamma World 4e: AD&D 2e Sci-Fi & Prototype D20

I'd had a notion that both Buck Rogers XXVc (1990) and Gamma World 4th edition (1992) roleplaying games were sci-fi adaptations of the AD&D 2e fantasy rules. Having both in the shop at the moment, I began studying them to see how each modified the classic rules to fit a science fiction setting. Surprises awaited!…

Wayne's Books (waynesbooks.games)

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