There is a new bass plugin for chiptunes files:
as0, asc, ay, chi, cop, dmm, dst, ftc, gtr, m, psc, psg, psm, pt1, pt2, pt3, sid, sqd, sqt, st1, s, st3, stc, stp, str, tf0, tfc, tfd, tfe, ts, txt, vtx, ym
I dont have any such files myself to test this but if anyone is interested in this plugin and has any of those files please contact me by PM