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I spent this evening falling down the rabbit-hole of S.A.M., the program "Software Automatic Mouth" for the Apple, Atari, and Commodore 8-bit computers made in 1982.
(More specifically, the JavaScript port at https://discordier.github.io/sam/ .)
There are probably better ways to run it than a Vice emulator or local HTML+JS page, but the only native options I found are all Linux-only sources and fail to build on FreeBSD, complaining of duplicate symbols in the LD phase.