VERY SOON. I think all PSOne digital imports are playable on all platforms (well at least PS3 and Vita these days, I guess).but yea I think PSP can play PS1 ports too but not sure.
http://www.siliconera.com/2013/12/06...north-america/ The article is kinda vague, it doesn't say who exactly is doing the digital import. (hey come to think of it, the PSStore lately has been hard to find the PS1 section, it seems to be merged with the PS3/vita games.) This Double Dragon has THE MOST EPIC opening (especially the music) intro in fighting game history!!!! ^-^ And the gameplay is decent and unique flavor of 2D fighting too (it's strange Linda isn't in the roster, but Marian makes up for it.) The NeoGeo version is better, but hey PS1 arcade fighter ports have always been playable and fun. Well fans prefer the beatem up style,but this DD fighter is 200% better than DDV,plus it made possible making playable characters that aren't playable in any other DD, PLUS better graphics + depth.