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Re:Commander Keen source code released by caf on Wednesday September 17, 2014 @01:24AM (#8328710)
That Wikipedia link claims that Commander Keen was the first PC sidescroller, but it was predated by (at least) Captain Comic.

I'm not sure if you'd call Sopwith a sidescroller but it managed to scroll sideways on CGA.

Re:Commander Keen source code released by jodrellblank on Wednesday September 17, 2014 @01:36PM (#8331224)