In the day we called it "THACK - oh" though I've now started pronouncing it "THAY-koh."
And even though I was with AD&D 2nd edition since about the start of that edition, the concept of THAC0 was a major stumbling block and not intuitive. I'm glad it's gone, and if I were to run 2e again, I would convert to modern ascending AC and attack bonuses.
And even though I was with AD&D 2nd edition since about the start of that edition, the concept of THAC0 was a major stumbling block and not intuitive. I'm glad it's gone, and if I were to run 2e again, I would convert to modern ascending AC and attack bonuses.