From owner-freebsd-hardware Sat Jun 24 14:30:28 2000 Delivered-To: freebsd-hardware@freebsd.org Received: from virtualtrends.com (virtualtrends.com [192.41.12.162]) by hub.freebsd.org (Postfix) with ESMTP id ED1F437B506 for ; Sat, 24 Jun 2000 14:30:13 -0700 (PDT) (envelope-from humanhunter@connectstar.net) Received: from skyline (06-104.024.popsite.net [216.126.161.104]) by virtualtrends.com (8.8.5) id PAA21147; Sat, 24 Jun 2000 15:30:18 -0600 (MDT) X-Authentication-Warning: virtualtrends.com: Host 06-104.024.popsite.net [216.126.161.104] claimed to be skyline Message-ID: <001101bfde3b$89437740$3700a8c0@skyline> From: "Blake" To: References: <8070C3A4E99ED211A63200105A19B99B3176B3@mail.edifecs.com> Subject: Re: Hardware in Space Date: Sat, 24 Jun 2000 17:23:06 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000A_01BFDE00.DBFB29A0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.00.2919.6600 X-MimeOLE: Produced By Microsoft MimeOLE V5.00.2919.6600 Sender: owner-freebsd-hardware@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org This is a multi-part message in MIME format. ------=_NextPart_000_000A_01BFDE00.DBFB29A0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable 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 -----=20 From: Michael VanLoon=20 To: 'Blake' ; freebsd-hardware@FreeBSD.ORG=20 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... =20 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=20 ----- Original Message -----=20 From: "Brian Handy" To: Sent: Wednesday, June 21, 2000 5:17 PM Subject: Re: Hardware in space? > Wow! What a great dose of information! Thanks everyone! >=20 > 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: >=20 > - 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. =20 >=20 > - 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: >=20 > http://aa.stanford.edu/~ssdl/ >=20 > 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! :-) >=20 > -- 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. >=20 >=20 > Thanks, >=20 > Brian > [Reporting in from Japan] >=20 >=20 >=20 > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-hardware" in the body of the message >=20 ------=_NextPart_000_000A_01BFDE00.DBFB29A0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Sure that would work, I'd get a socket = prcessor=20 too... it's attached to the motherboard a little cleaner.. K6-2 400 on a = MB=20 clocked at 33mghtz and the multiplier clocked low.. that should take = care of the=20 heat
----- Original Message -----
From:=20 Michael=20 VanLoon
To: 'Blake' ; freebsd-hardware@FreeBSD.ORG =
Sent: Saturday, June 24, 2000 = 1:55=20 PM
Subject: RE: Hardware in = space?

I don't think I'd get a P200.  I'd go = with a=20 modern .18 micron processor, which will run very cool when=20 under-clocked.  Then go with the lowest speed the motherboard = will=20 support.  Of course, modern processors are clock locked for the = most=20 part, so...
 
Maybe a .25 micron K6-2 or K6-3, which is=20 under-clocked, since they are not multiplier locked.  An Athlon = could do=20 this too with a GFD, but the GFD would almost certainly fall of during = dramatic shaking.
-----Original Message-----
From: Blake=20 [mailto:humanhunter@connectstar.net]
Sent: Wednesday, June = 21,=20 2000 11:17 PM
To: = freebsd-hardware@FreeBSD.ORG
Subject:=20 Re: Hardware in space?

try getting a faster CPU and = underclocking it..=20 say a P200 running at 66mghz or something.. get a 100 bus speed = mghtz cpu an=20 run it at 66 mghz  or 33... that will make cooling MUCH easier=20
----- 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=20 space?

> Wow!  What a = great dose of=20 information!  Thanks everyone!
>
> I've got a = bunch of=20 information, and a handful of people to respond to...
> so = stand by,=20 those of you who know who you are.  Anyway, a couple of
> = clarifications since I stirred up so much interest:
>
> = - This=20 is only the proposal stage of the instrument.  The way NASA=20 works
> is every year they make "Announcements of = Opportunity", which=20 is a thingy
> that invites us to write proposals to do = work. =20 There are lots of various
> categories of this, from data = analysis of=20 Solar Flares to theoretical
> consideration of pulsar = evolution to=20 proposing new instruments for the
> Next Generation Space=20 Telescope.  If we win, we'd start working on this
> = sometime next=20 year, probably, with a launch slated for about 3 years after
> = that. 
>
> - The sounding rocket environment = isn't quite=20 as bad as it sounds.  The
> computer will be grounded to = the=20 chassis, but this doesn't mean it's going
> to get real = cold. =20 We've only got 5 minutes above the atmosphere, and I
> think = it'd take=20 a fair bit longer than that to get cold enough to matter.
> = There's a=20 group at Stanford that's taken this to an extreme:
>
>=20 http://aa.stanford.edu/~ssdl/
>
> These guys are trying to get to where they = can turn a=20 satellite into a
> senior thesis project for a student.  = (I don't=20 think they've gotten it
> down to a year yet, though.)  = Basically=20 they're working on the level of
> re-inventing Sputnik.  = Amazing=20 stuff, amazingly simple, teaches people a
> bunch.  Way = below the=20 level of sophistication I have to aim for,
> = unfortunately.  I'm=20 told some of their electronics parts come from Radio
> = Shack! =20 :-)
>
> -- While getting too cold probably isn't an = issue,=20 COOLING certainly is.
> As a few people have alluded to, = cooling in=20 space becomes an issue because
> there's no air.  This = will be a=20 problem much earlier, because we'll
> evacuate the payload = several=20 hours before launch.  If there's a delay, the
> package = could=20 wind up sitting on the launch rail for a few days under
> = vacuum. I've=20 worried about blowing the top off the CPU from the heat.  = I
>=20 imagine it'll probably have to be heat-sunk to the chassis in some=20 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=20 stuffing it to disk, so I'll
> probably wind up doing some=20 experimentation to see just what I'll need.
>
> =
>=20 Thanks,
>
> Brian
> [Reporting in from = Japan]
>=20
>
>
> To Unsubscribe: send mail to majordomo@FreeBSD.org
> with=20 "unsubscribe freebsd-hardware" in the body of the message
>=20
------=_NextPart_000_000A_01BFDE00.DBFB29A0-- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message