Date: Sat, 24 Jun 2000 17:23:06 -0700 From: "Blake" <humanhunter@connectstar.net> To: <freebsd-hardware@FreeBSD.ORG> Subject: Re: Hardware in Space Message-ID: <001101bfde3b$89437740$3700a8c0@skyline> References: <8070C3A4E99ED211A63200105A19B99B3176B3@mail.edifecs.com>
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Sure that would work, I'd get a socket prcessor too... it's attached to the motherboard a little cleaner.. K6-2 400 on a MB clocked at 33mghtz and the multiplier clocked low.. that should take care of the heat
----- Original Message -----
From: Michael VanLoon
To: 'Blake' ; freebsd-hardware@FreeBSD.ORG
Sent: Saturday, June 24, 2000 1:55 PM
Subject: RE: Hardware in space?
I don't think I'd get a P200. I'd go with a modern .18 micron processor, which will run very cool when under-clocked. Then go with the lowest speed the motherboard will support. Of course, modern processors are clock locked for the most part, so...
Maybe a .25 micron K6-2 or K6-3, which is under-clocked, since they are not multiplier locked. An Athlon could do this too with a GFD, but the GFD would almost certainly fall of during dramatic shaking.
-----Original Message-----
From: Blake [mailto:humanhunter@connectstar.net]
Sent: Wednesday, June 21, 2000 11:17 PM
To: freebsd-hardware@FreeBSD.ORG
Subject: Re: Hardware in space?
try getting a faster CPU and underclocking it.. say a P200 running at 66mghz or something.. get a 100 bus speed mghtz cpu an run it at 66 mghz or 33... that will make cooling MUCH easier
----- Original Message -----
From: "Brian Handy" <handy@isass0.solar.isas.ac.jp>
To: <freebsd-hardware@FreeBSD.ORG>
Sent: Wednesday, June 21, 2000 5:17 PM
Subject: Re: Hardware in space?
> Wow! What a great dose of information! Thanks everyone!
>
> I've got a bunch of information, and a handful of people to respond to...
> so stand by, those of you who know who you are. Anyway, a couple of
> clarifications since I stirred up so much interest:
>
> - This is only the proposal stage of the instrument. The way NASA works
> is every year they make "Announcements of Opportunity", which is a thingy
> that invites us to write proposals to do work. There are lots of various
> categories of this, from data analysis of Solar Flares to theoretical
> consideration of pulsar evolution to proposing new instruments for the
> Next Generation Space Telescope. If we win, we'd start working on this
> sometime next year, probably, with a launch slated for about 3 years after
> that.
>
> - The sounding rocket environment isn't quite as bad as it sounds. The
> computer will be grounded to the chassis, but this doesn't mean it's going
> to get real cold. We've only got 5 minutes above the atmosphere, and I
> think it'd take a fair bit longer than that to get cold enough to matter.
> There's a group at Stanford that's taken this to an extreme:
>
> http://aa.stanford.edu/~ssdl/
>
> These guys are trying to get to where they can turn a satellite into a
> senior thesis project for a student. (I don't think they've gotten it
> down to a year yet, though.) Basically they're working on the level of
> re-inventing Sputnik. Amazing stuff, amazingly simple, teaches people a
> bunch. Way below the level of sophistication I have to aim for,
> unfortunately. I'm told some of their electronics parts come from Radio
> Shack! :-)
>
> -- While getting too cold probably isn't an issue, COOLING certainly is.
> As a few people have alluded to, cooling in space becomes an issue because
> there's no air. This will be a problem much earlier, because we'll
> evacuate the payload several hours before launch. If there's a delay, the
> package could wind up sitting on the launch rail for a few days under
> vacuum. I've worried about blowing the top off the CPU from the heat. I
> imagine it'll probably have to be heat-sunk to the chassis in some manner.
> Someone mentioned using a 486; that's not such a bad idea. Mostly I'm
> just grabbing data from the RS-232 ports and stuffing it to disk, so I'll
> probably wind up doing some experimentation to see just what I'll need.
>
>
> Thanks,
>
> Brian
> [Reporting in from Japan]
>
>
>
> To Unsubscribe: send mail to majordomo@FreeBSD.org
> with "unsubscribe freebsd-hardware" in the body of the message
>
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<DIV><FONT face=Arial size=2>Sure that would work, I'd get a socket prcessor
too... it's attached to the motherboard a little cleaner.. K6-2 400 on a MB
clocked at 33mghtz and the multiplier clocked low.. that should take care of the
heat</FONT></DIV>
<BLOCKQUOTE
style="BORDER-LEFT: #000000 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px; PADDING-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A href="mailto:MichaelV@EDIFECS.COM" title=MichaelV@EDIFECS.COM>Michael
VanLoon</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
href="mailto:humanhunter@connectstar.net"
title=humanhunter@connectstar.net>'Blake'</A> ; <A
href="mailto:freebsd-hardware@FreeBSD.ORG"
title=freebsd-hardware@FreeBSD.ORG>freebsd-hardware@FreeBSD.ORG</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Saturday, June 24, 2000 1:55
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> RE: Hardware in space?</DIV>
<DIV><BR></DIV>
<DIV><FONT color=#800000 face="Century Gothic"><SPAN
class=915043820-24062000>I don't think I'd get a P200. I'd go with a
modern .18 micron processor, which will run very cool when
under-clocked. Then go with the lowest speed the motherboard will
support. Of course, modern processors are clock locked for the most
part, so...</SPAN></FONT></DIV>
<DIV><FONT color=#800000 face="Century Gothic"><SPAN
class=915043820-24062000></SPAN></FONT> </DIV>
<DIV><FONT color=#800000 face="Century Gothic"><SPAN
class=915043820-24062000>Maybe a .25 micron K6-2 or K6-3, which is
under-clocked, since they are not multiplier locked. An Athlon could do
this too with a GFD, but the GFD would almost certainly fall of during
dramatic shaking.</SPAN></FONT></DIV>
<BLOCKQUOTE>
<DIV align=left class=OutlookMessageHeader dir=ltr><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B> Blake
[mailto:humanhunter@connectstar.net]<BR><B>Sent:</B> Wednesday, June 21,
2000 11:17 PM<BR><B>To:</B> freebsd-hardware@FreeBSD.ORG<BR><B>Subject:</B>
Re: Hardware in space?<BR><BR></DIV></FONT>
<DIV><FONT face=Arial size=2>try getting a faster CPU and underclocking it..
say a P200 running at 66mghz or something.. get a 100 bus speed mghtz cpu an
run it at 66 mghz or 33... that will make cooling MUCH easier
</FONT></DIV>
<DIV><FONT face=Arial size=2>----- Original Message ----- </FONT>
<DIV><FONT face=Arial size=2>From: "Brian Handy" <</FONT><A
href="mailto:handy@isass0.solar.isas.ac.jp"><FONT face=Arial
size=2>handy@isass0.solar.isas.ac.jp</FONT></A><FONT face=Arial
size=2>></FONT></DIV>
<DIV><FONT face=Arial size=2>To: <</FONT><A
href="mailto:freebsd-hardware@FreeBSD.ORG"><FONT face=Arial
size=2>freebsd-hardware@FreeBSD.ORG</FONT></A><FONT face=Arial
size=2>></FONT></DIV>
<DIV><FONT face=Arial size=2>Sent: Wednesday, June 21, 2000 5:17
PM</FONT></DIV>
<DIV><FONT face=Arial size=2>Subject: Re: Hardware in
space?</FONT></DIV></DIV>
<DIV><BR></DIV><FONT face=Arial size=2>> Wow! What a great dose of
information! Thanks everyone!<BR>> <BR>> I've got a bunch of
information, and a handful of people to respond to...<BR>> so stand by,
those of you who know who you are. Anyway, a couple of<BR>>
clarifications since I stirred up so much interest:<BR>> <BR>> - This
is only the proposal stage of the instrument. The way NASA
works<BR>> is every year they make "Announcements of Opportunity", which
is a thingy<BR>> that invites us to write proposals to do work.
There are lots of various<BR>> categories of this, from data analysis of
Solar Flares to theoretical<BR>> consideration of pulsar evolution to
proposing new instruments for the<BR>> Next Generation Space
Telescope. If we win, we'd start working on this<BR>> sometime next
year, probably, with a launch slated for about 3 years after<BR>>
that. <BR>> <BR>> - The sounding rocket environment isn't quite
as bad as it sounds. The<BR>> computer will be grounded to the
chassis, but this doesn't mean it's going<BR>> to get real cold.
We've only got 5 minutes above the atmosphere, and I<BR>> think it'd take
a fair bit longer than that to get cold enough to matter.<BR>> There's a
group at Stanford that's taken this to an extreme:<BR>> <BR>>
</FONT><A href="http://aa.stanford.edu/~ssdl/"><FONT face=Arial
size=2>http://aa.stanford.edu/~ssdl/</FONT></A><BR><FONT face=Arial
size=2>> <BR>> These guys are trying to get to where they can turn a
satellite into a<BR>> senior thesis project for a student. (I don't
think they've gotten it<BR>> down to a year yet, though.) Basically
they're working on the level of<BR>> re-inventing Sputnik. Amazing
stuff, amazingly simple, teaches people a<BR>> bunch. Way below the
level of sophistication I have to aim for,<BR>> unfortunately. I'm
told some of their electronics parts come from Radio<BR>> Shack!
:-)<BR>> <BR>> -- While getting too cold probably isn't an issue,
COOLING certainly is.<BR>> As a few people have alluded to, cooling in
space becomes an issue because<BR>> there's no air. This will be a
problem much earlier, because we'll<BR>> evacuate the payload several
hours before launch. If there's a delay, the<BR>> package could
wind up sitting on the launch rail for a few days under<BR>> vacuum. I've
worried about blowing the top off the CPU from the heat. I<BR>>
imagine it'll probably have to be heat-sunk to the chassis in some
manner.<BR>> Someone mentioned using a 486; that's not such a bad
idea. Mostly I'm<BR>> just grabbing data from the RS-232 ports and
stuffing it to disk, so I'll<BR>> probably wind up doing some
experimentation to see just what I'll need.<BR>> <BR>> <BR>>
Thanks,<BR>> <BR>> Brian<BR>> [Reporting in from Japan]<BR>>
<BR>> <BR>> <BR>> To Unsubscribe: send mail to </FONT><A
href="mailto:majordomo@FreeBSD.org"><FONT face=Arial
size=2>majordomo@FreeBSD.org</FONT></A><BR><FONT face=Arial size=2>> with
"unsubscribe freebsd-hardware" in the body of the message<BR>>
</FONT></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>
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