Well if you can't embedded it in an astronaught, then a metal box should do
the trick,  if its only 100-150k's up then radiation isn't you main concern,
I would be more worried about temp extremes and trying to stop the stepper
from seizing up (I am assuming that this will be exposed to vacuum?  you
will need to repack the bearings with Fomblin(sp? $$) grease so it wont
seize up.

Will this project be attached to anything else?  If it is small and free
floating then watch out for accumulating a large charge, treat as you would
a sensitive ESD.  If it really has to stay up for a long time, consider an
electron gun to bleed charge off.

        cya,    Andrew...

> -----Original Message-----
> From: John C. Frenzel [SMTP:johnfrenzel@YAHOO.COM]
> Sent: Thursday, October 28, 1999 7:03 AM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Re: EEPROM or FLASH which is better?
>
> My top 3 choices are:
> 1- OTP
> 2- OTP
> 3- One Time Programmable (equiv of a prom)
> the memory is nonerasable
> John
>
> >         Hi, all.
> > I'm on a proyect to build a small and very dumb controller to drive a
> stepper
> > motor, the program just start when one pin go to low state and move the
> > motor at about 80pps for 10 seconds, that part is O.k. works fine,
> > but It must work fine at the space for about a week, shuttle nominal
> > altitude, so the question is: which kind of device to do this is better:
> > EEPROM, EPROM or FLASH??.
> >
> > I know that radiation and high enery particles erases most memories but
> > if the enclosure is good they will need more than a month, may be more
> to
> > erase at least 1 bit (I'm talking about EPROM) but I have no idea about
> > the other kind of memories EEPROM and FLASH.
> > have someone an idea which will be the difference in this enviroment?
> > I need to make a decision about the pic to use for that app.
> > thanks!.
>
>
>
> __________________________________________________
> Do You Yahoo!?
> Bid and sell for free at http://auctions.yahoo.com