Actually the console games are the clones... The arcade games 99% of the time came first, then got ported to consoles because they were popular.
CPS2, as someone else said, is the hardware that many of Capcom's 2D fighting games (and some non fighters) were created on. Stuff like Marvel Vs. Capcom, Darkstalkers, Street Fighter Alpha etc.
See here for more info:
http://www.system16.com/capcom/hrdw_cps2.html