I thought that was impossible on the "A" revision of the chip?
Most games use Asic27a chips. Martial Masters, Kov2, photoy2k, kovsh, puzzli2, puzlstar, oldsplus, kovshp. There are different revisions of the Asic27a (55857E,55857F,55857G). Afaik, only the ones used in games like killbldp, svg, theglad,and dmnfrnt are at this point undumpable (well... mostly undumpable), but I could be wrong. The whole dumping/trojaning thing is XingXing's specialty, he is really the person to ask.