1802 was manufactured in SOS I don't think all.  I don't know for sure if SOS versions were used on the Voyager's. Someone might know for sure.

Harris bought the old RCA plant in NJ where the 1802 was manufactured. We wrote a C compiler for one of the Harris parts and at one time I was introduced to the guy that taped out the 1802 part. He was coming to work for few months after his retirement
date so he would be available if needed to troubleshoot possible problems when the last voyager made its last major planet encounter.

Nothing like having a team waiting.

w..



wouter van ooijen wrote:

> > A piece of trivia the Voyager space craft used the RCA 1802.
> > It was quite radiation resistant because of the rather large
> > track sizes on the silicon. Radiation would ionize a local
> > part of the processor generally without enough charge to
> > change the logic state. The 1802 was laid out on mylar like
> > an old time PC board and photo reduced then etched on
> > silicon.
>
> IIRC the 1802 was one of the few chips that were made in SoS (Silicon On
> Saphire) process, which made it very radiation-hard.
>
> Space stuff often uses 'old' designs, simply because those were made
> with larger geometries that current designs. Large geometry == more
> radiation resistant.
>
> Wouter van Ooijen
>
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