What dialects change ます into やす?

Question

What dialects change ます into やす, as in these examples:

• 「何が出やしたか…？見ておくんなせェ」
• 「そう決めやしたね…？」
• 「ならあちらさんの勝ちだ…今夜は逮捕しやせん」

It appears to be Edo dialect. Is that correct?

Answer 1

Yes, one can call it Edo dialect and all of your examples look Edo/Tokyo as well. Today, 「やす」 is no longer used by many in real life around Tokyo. It is more "known" as the honorific sentence-ender in the underworld in fiction.

I would need to point out, though, that the auxiliary verb 「やす」 was originally a Kansai phenomenon. It is still used in Kyoto in polite imperatives.