At 11:20 PM 10/29/97 +1100, you wrote:
>G'day,
>
>        Our team has been thinking about using a PIC16C84 as the core of
>an amateur radio Balloon payload experiment. These Balloons reach over
>20km (about 60,000 feet). At those altitudes, radiation is quite high.
>Does anybody know about the effects of this radiation on the micro,
>or its chances of causing latch-up.

I've used BASIC Stamps, which use non-flash, non-EEPROM PICS for several
balloon flights with no ill effects.

73, Dave, N9LTD