> 2.  If you write the OSCCAL number on the TOP side of the JW part, the
> ink will be erased by the UV EEPROM eraser after 3-4 times, especially
> if you forget and leave it in the eraser all night.  Write the number
> on a sticker and stick it to the underside of the part.

So far the only thing that worked for me (even pencil wears off) was
scribing the value with a steel needle on the brass part on top. Put the
chip in a solid socket with a shim under it (PCB strip) while doing this
to avoid squishing the pins.

Peter

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