6 Dec
2000
6 Dec
'00
2:33 p.m.
Does anyone have an extra 68040 cpu running at 33mhz that
they don't need? I'vd had a LC-575 mainboard here to put in my Color
Classic but it's original CPU came out on it's way to me and a good
portion of the pins are pretty mangled.
Thanks
Jeff
--
Collector of Classic Microcomputers and Video Game Systems:
Home of the TRS-80 Model 2000 FAQ File
http://www.geocities.com/siliconvalley/lakes/6757
6 Dec
6 Dec
2:48 p.m.
Does anyone have an extra 68040 cpu running at 33mhz that
they don't need? I'vd had a LC-575 mainboard here to put in my Color
Classic but it's original CPU came out on it's way to me and a good
portion of the pins are pretty mangled.
Thanks
Jeff
Something to consider, is that a 68040 or a 68LC040? A lot of the 68040
based Mac's were not pure 68040 chips. IIRC, it basically meant they were
missing the math coprocessor.
Zane
3:41 p.m.
Something to consider, is that a 68040 or a 68LC040? A
lot of the 68040
based Mac's were not pure 68040 chips. IIRC, it basically meant they were
missing the math coprocessor.
Yeah, I know. My Quadra 605 had the 'LC' type without the
coprocessor. At this stage, it really doesn't make a difference, as
I've not even been able to test the board since getting it because of
the damaged CPU that came with it. I'd like to get the full 'RC'
type but an 'LC' chip would be ok as long as it's a 33mhz and not a
20 or 25 mhz.
Jeff
--
Collector of Classic Microcomputers and Video Game Systems:
Home of the TRS-80 Model 2000 FAQ File
http://www.geocities.com/siliconvalley/lakes/6757
7:47 p.m.
Does anyone have an extra 68040 cpu running at 33mhz
that
they don't need? I'vd had a LC-575 mainboard here to put in my Color
Classic but it's original CPU came out on it's way to me and a good
portion of the pins are pretty mangled.
Take a mechanical pencil that uses a lead about the same size as the pins,
and carefully slip the metal barrel of the pencil over the pin and
straighten them one at a time. A 33 mhz full 68040 is worth about $25, so
tossing one due to a few bent pins isn't very thrifty. If its totally
mangled, email me, $25 plus $3.55 shipping in the US.
4:02 p.m.
New subject: minor OT accidents that happened was: Re: 68040 cpu needed
Date: Wed, 6 Dec 2000 22:47:13 -0800
To: classiccmp(a)classiccmp.org
From: Mike Ford <mikeford(a)socal.rr.com>
Subject: Re: 68040 cpu needed
Reply-to: classiccmp(a)classiccmp.org
Take a mechanical pencil that uses a lead about the
same size as the pins,
and carefully slip the metal barrel of the pencil over the pin and
straighten them one at a time. A 33 mhz full 68040 is worth about $25, so
tossing one due to a few bent pins isn't very thrifty. If its totally
mangled, email me, $25 plus $3.55 shipping in the US.
Groan!! Good idea on that mechanical pencil!
Few weeks ago, I had to straighten out about 20% of bent pins on a
boxed 200 mmx cpu, few of pins are hard crushed against package at
sharp angle. I used watch tweezers and small jeweller's screwdriver
to undo all that damage. The boxed fan blades were snapped off 4
out of 7. Unbalanced rotor big time. Raided one from P4T (pentium
overdrive 133 for socket 4) by peeling off label, pop off the
E-clip and transfer the good rotor to 200mmx. Reinstall clip,
cover the hole. All fine now.
What did that crunch? Loose cpu (my brain wasn't screwed
on right that day) in boxful of heavy items such as two cdroms,
bigfoot, ibm 540mb scsi. Dropped that box when hand carrying hole
ripped open as I stepped heavily off the bus. ;-) Don't worry, these
hard drives were turned in by customers for checks and they were
still bad and unwarrentied anyway. I only can carry it one handed
bec other hand is holding my aucient badly frayed camera bag long
past it's lives.
Have tiny budget and new decent backpack needed cost over 100cdn.
This will change when I have full-time job. I keep myself busy
working part-time at two computer shop both reputatable. Also I'm
having job planning meetings. This is one of big reasons to get out
of under the budget crunch (708 cdn a month) and start the driving
lessons. Driver license holder shows big responsibility and freedom
to go anywhere. Also more reliable way to get to work in employer's
eyes. I'm stuck with untrustworthy bus system. That night bus was
20min late to catch heading home during snow squalls but the roads is
still good, no excuses. :-P
Whoops, better jump into bed shivering!
Cheers,
Wizard
7 Dec
7 Dec
4:11 a.m.
New subject: 68040 cpu needed (more)
Greetings, fellow denizens of Dumpsterland... ;)
On Thursday 07 December 2000 00:47, you wrote:
> Does anyone have an extra 68040 cpu running at
33mhz that
>they don't need?
Your LC575 was originally built with a 33MHz 68LC040, which is the low-cost
fpu-less version of the chip. It could be replaced with either a 68040 or
68LC040 part, with the full '040 having better performance in some
situations. The *significant* advantage (IMO) to using the full '040, is that
it enables the machine to run either Linux or NetBSD.
Interestingly enough, the 25MHz part seems to be totally capable of
overclocking to 33MHz, and with a heatsink, will run cooler at 33MHz than
bare at 25Mhz. There is interesting info on overclocking the 68040 on the
LC475, Performa 475 and Quadra 605 models at:
http://socrates.berkeley.edu/~schrier/475s.html -and-
http://socrates.berkeley.edu/~schrier/q605.html
I'm planning to do the 'switch' mod described in the former URL. If you need
a 25MHz 68LC040 to replace yours, I should have a spare available in about a
week... after I'm done upgrading my LC475 so I can load Debian m68k :)
--
Bill Layer
<b.layer(a)vikingelectronics.com>
8624
days inactive
8625
days old
5 comments
5 participants
participants (5)
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b.layer＠vikingelectronics.com -
healyzh＠aracnet.com -
jhellige＠earthlink.net -
jpero＠sympatico.ca -
mikeford＠socal.rr.com