Silicone on Sapphire

[BillCRAV]

(03-12-2016 03:03 AM)jjohnson873 Wrote:  {snip}

I worked for RCA when they were manufacturing SOS technology in their Findlay, OH wafer fab. It was often used in space applications since it was resistant to SEU (single event upset) and it was a very low power process. The RCA CDP1802 8-bit microcontroller was used in many space applications and was, at the time, one of the very few SOS microcontrollers that also was capable of low power. Some of you may even remember that this microcontroller had a FORTH compiler and the people who used FORTH swore by its efficiency. It was probably the only micro that had a SEX instruction in assembly (selects one of the 16 registers to be an index register).
~ Jim J. ~

Hi. I'm trying to get an as absolute as possible fix on CDP1802 chips created in Silicon-on-Sapphire.
So far I haven't been able to find any documents that make certain, sure, absolute comments that
can't be interpreted one way or another.

I have found absolute documentation that some CDP chips were created as SOS at Sandia Labs.
(RAM and ROM and some others) But not the 1802. (as in maybe, maybe not)

I haven't seen any mention of "Findlay, OH", as SOS or anything else in relation to RCA.

Some 1802 people think all 1802 chips were SOS. But I have found documentation that says they WERE created as "bulk silicon", which I believe means they were NOT SOS.

So ANY information you have about this issue would be greatly appreciated.
As much as you remember might point me in the direction to find the documentation we need.
At the very least we will have a first-person 'anecdotal' source.

Thanks.