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From: john larkin <JL@gct.com>
Newsgroups: sci.electronics.design
Subject: Re: OT: Linix goes politics
Date: Sun, 27 Oct 2024 11:19:08 -0700
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On Sun, 27 Oct 2024 12:08:29 -0000 (UTC), antispam@fricas.org (Waldek
Hebisch) wrote:

>Don Y <blockedofcourse@foo.invalid> wrote:
>> On 10/26/2024 3:58 PM, Waldek Hebisch wrote:
>>> Pi Pico is more powerful than the onboard computer.  But there were
>>> also mainframes in ground support center.  Pico can perform more integer
>>> instructions per second than those mainframes, but has less memory.
>>> And mainframes had fast mass storage (drums and a disk farm).
>>> Raspberry PI version 1 has more memory and SD-card has more bandwidth
>>> than several mainframe disks.  OTOH I would avoid SD-card in mission
>>> critical operations, so probably two Raspberries (two for reliablilty,
>>> ground support mainframes also run in redundant configuration) with
>>> external USB SSD discs...
>> 
>> How long do you think any of that would RELIABLY operate in a
>> supraterrestrial environment?
>
>I do not know.  Standard commercial MCU-s are used in many small
>experimental low-orbit statelites, and seem to work, so they may
>be enough.  Certainly before lanching people into space one needs
>to spend time to test and select stuff that will work well there.

Cubesats only last a few years, so commercial parts are often OK.

I have a friend in the small sat business. I'll ask him.

People last a lot shorter time in orbit than uPs.