New devices won't program

[Garry Motter]

Been using p89c51rc2ba successfully for a long time, with the RC modification on /EA.  Suddenly these got scarce, so I'm trying to substitute -ra2ba.  Got a batch, presumably new, from a reputable distributor, and I can't program them. In the terminal test, they don't echo back the U. I can swap in one of my few remaining rc2 parts and everything is beautiful.

Any ideas what's wrong (or failing that, where can I get some -rc2ba)?

P.S. I love FlashMagic! Easy to use and no more lost boot vectors!