Re: How NASA Built Artemis II’s Fault-Tolerant Computer :: Remember, remember, the velvet November


node:	Re: How NASA Built Artemis II’s Fault-Tolerant Computer
template:	4
parent:	How NASA Built Artemis II’s Fault-Tolerant Computer
owner:	toxygen
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created:	10.04.2026 - 16:01:24

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ABSOLUT
KYBERIA

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v clanku sa spomina apollo 11 palubny pocitac. par rokov dozadu bola o tom na CCC pekna prednaska:

tu je trochu menej technicka verzia:

inak su freely available rozne simulatory toho guidance pocitaca, ak by sa chcel niekto pohrat (aj bez instalacie, cislo len v web/js)

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mne odpalilo dekel ked som cital ako ho opravili (workaroundli) na dialku , toto:

Voyager 1 Thruster/Memory Fix (2024–2025)

The Problem: Voyager 1, launched in 1977, stopped sending usable scientific data in November 2023 due to a corrupted memory chip in its flight data subsystem (FDS).

The Fix: Because the spacecraft is in interstellar space with nearly 50-year-old technology, NASA engineers could not physically reach it. Instead, they remotely sent new code to the spacecraft's computer, instructing it to bypass the corrupted memory section and re-enable functionality.
Significance: It was a "miracle save" done remotely, using 1970s technology over a distance that takes over 23 hours for a signal to travel one way.

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presne toto ma dostalo, a obrovsky respekt

https://news.ycombinator.com/item?id=41517272

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jj, zaujimave je, ze dnes uz nevyrabame space elektroniku, ktora by vydrzala tak dlho, ako tie 1st/2nd gen vesmirne misie. Vsetky spoje su mensie, rychlejsie a nachylnejsie na single-event upset (bity zmenene radiaciou). samozrejme, cim tensie, tym skor v nich prepali vesmirna radiacia dieru, cez ktoru uz ten prud nepotecie...

ak sa ti pacil ten trik s pamatou (je to relativne bezna vec u modernych space misii, ale navrhnut to v 1977 - to je iny level), mohol by ta zaujimat tento clanok: https://flownet.com/gat/jpl-lisp.html

konkretne:

Also in 1993 I used MCL to help generate a code patch for the Gallileo magnetometer. The magnetometer had an RCA1802 processor, 2k each of RAM and ROM, and was programmed in Forth using a development system that ran on a long-since-decommissioned Apple II. The instrument had developed a bad memory byte right in the middle of the code. The code needed to be patched to not use this bad byte. The magnetometer team had originally estimated that resurrecting the development environment and generating the code patch would take so long that they were not even going to attempt it. Using Lisp I wrote from scratch a Forth development environment for the instrument (including a simulator for the hardware) and used it to generate the patch. The whole project took just under 3 months of part-time work.

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Pre mňa je neuveriteľné, že Voyager 1 & 2 sú vybavené 8-stopovým DTR, ktoré funguje aj po 50 rokoch.

How was magnetic tape decay prevented in Voyager 1?

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tak o tom som nevedel, utrzok vyzera lakavo, idem citat, dik :)