Even more interesting that they both use the IBM POWER architecture!
0, https://www.moog.com/products/avionics/spacecraft-avionics/b...
1, https://en.wikipedia.org/wiki/RAD5500
2, https://web.archive.org/web/20190226111129/https://www.baesy...
Frontgrade also advertises a rad-hard RISC-V, as does Microchip (a PIC64 variant), that I know nothing about, but seems like an inevitable next step. Seems like you could grab some Xilinx rad-hard FPGA and bobs your uncle.
In comparison radtherapy patients get 20 gray in 1-2 weeks so it's the 20/10000 = 0.02% of what these designs target
[1] yes...I know the TRS-80 had a z80, not an 8085. Close enough.
The inertial navigation system is the very crazy part, along with the nuclear fusion warhead design itself.
I seriously doubt you need to fabricate 50k CPUs for a single space probe, including backups, testing chips, etc.
Back then an interface between terrestrial computer systems and a Zeta Reticulan spacecraft required a small supercomputer on our side.
“The chips were made on a n-on-n+ epitaxial substrate to provide latchup control, extensive guard rings around transistors were used and hardened oxides”
> An 8085 processor that could handle 1×106 rads of radiation with only a 25% reduction in performance, and 3×106 rads with a 40% drop.
Hmm, from where did they copy-paste this mangled scientific notation?
Ah here we are, pg. 37 (46 in PDF file): https://apps.dtic.mil/sti/tr/pdf/ADA063902.pdf
I guessed after about a second of thought that this actually meant 10^6. If I had to guess how this happened, somebody just wrote their prose in Word with the 6 in superscript and cut and paste it into HTML which lost the formatting.
EDIT: seems I'm being downvoted for this comment. I think it's a shame if you consider the whole article (which I personally found very interesting) as slop because of 2 incorrectly formatted numbers that could easily result from a cut-and-paste error. It's clear the article hadn't been well proof read as there are a number of spelling mistakes too, but that doesn't make the content itself slop.