Larry;

Used to be able to change the osc type on OTP parts.  You might recall that
A OSC of RC is the erased state of a JW type part.  I ran into a similar
situation some time ago and called a Microchip FAE he told me that on the
chip is another programmable fuse that is now set after they qulify the part
for OSC type.  Turns out that the good-ol days of buying cheeper RC parts
and then changeing them to LP, XT, HS etc are over....

David Jeffers
OSP Technologies, Inc.

ps: I was a RC Cheep-Skate....