This is a old-fashioned/Kyongsang regional dialect sentence ending that is equivalent to -(으)세요 or 요?.

I haven't heard this much in spoken Korean but I've seen it in written Korea a few times and many times in Korean movie subtitles.

- is used to social equals (i.e. people same age/rank/class, close friends) or inferiors (children, people younger than you, power of lower rank, etc.); never use to social superiors

Examples:
이리 와 보소./Come and look at this (equivalent to 이리 와 보세요.)
책을 읽겠소?/Will you read a book?