faking computer fan RPM signals
Joseph
remove them and put in some of my own fans that are very quiet.
However, low and behold the motherboard shuts down when I remove its
internal fan. This is because the motherboard actually reads an RPM
signal from the fan and shuts down when it doesn 't see it. I am
looking for a RPM circuit that can fake this kind of signal. I figure
its a ON-OFF-ON-OFF type of signal that gets fed into the motherboard.
Does anyone know of any website or links that has this type of simple
circuitry.
OBones
Well, I'd generate some with a NE555, that's the most simple astable
oscillator I know of.
Jim Thompson
Before I replaced it completely, my previous machine lost a case fan.
It was a three-wire RPM output type.
I found a setting in the BIOS that allowed me to shut off the RPM
sensing so I could use a two-wire fan.
...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
colin
"Joseph" <spm...@canada.com> wrote in message
news:1113836141.7...@l41g2000cwc.googlegroups.com...
as another poster said this feature is usualy enabled/diasbled in the bios
setup, ive replaced several fans in my system with very quiet ones but they
have fan speed sense signals.
the suposedly quiet antec psu i have has 2 fans on it, one on outside and
one on the inside, however there is a seperate set of holes that has no fan
so i put a third fan on this, this meant when the cpu was using 100% it no
longer needed to speed up its fans and so remains quiet, handy it has a fan
conector.
i also managed to modify one fan ages ago so it had a speed sensor just by
adding 2 diodes conected to the coil drive.
you could always add an extra quiet fan with sense signal and put it
somewhere usefull and use this, or i suspect you would be able to use the
sense signal of one fan and conected it to more than one input.
- i gues this is what they call 'fan out' heh
quiet fans usualy move less air ... i would hope this isnt a server thats
relied upon 100% of the time.
Colin =^.^=
Joseph
computer, inside are 2 extremely noisy computer fans + the one in the
power supply. So 3 noisy fans. Its like you have a vacuum cleaner
going at maximum speed. So far I have not found the key switch to
allow me into the bios to check this enable/disable mechanism. I am
assuming it can't be disable.
PS: Wow Compaq engineers are so smart, I guess that's why they merge
with HP. That's right, design machines that once retired from service
must be landfilled instead of being put to good use by some good
people.
petrus bitbyter
"Joseph" <spm...@canada.com> schreef in bericht
news:1113846772....@f14g2000cwb.googlegroups.com...
Why not go back to the source. On www.compaq.com you can search for - and
find - (almost) all the doc you need. The manual part
http://h20000.www2.hp.com/bc/docs/support/UCR/SupportManual/TPM_179764-001_ch4/TPM_179764-001_ch4.pdf
shows the switches you need to use for changing configuration and wiping the
CMOS-data. Other chapters of the manual, diagnostic tools and packs are also
available, for free. If all that fails you can simply ask a question and get
an answer by e-mail. That's to say I always got one so far.
petrus bitbyter
Guy Macon
Joseph wrote:
>The computer I am running is a Compaq Proliant 3000 server class
>computer, inside are 2 extremely noisy computer fans + the one in the
>power supply. So 3 noisy fans. Its like you have a vacuum cleaner
>going at maximum speed. So far I have not found the key switch to
>allow me into the bios to check this enable/disable mechanism. I am
>assuming it can't be disable.
On all Compaq machines, you get into the BIOS by hitting F10 when you
see the blinking square at the top right of the screen during powerup.
Also, your BIOS is on a hard disk partition, not on the motherboard.
Get yourself a Compaq SmartStart CD on eBay so you can restore it.
It doesn't matter what version of smartStart; the newer ones handle
newer servers but the files for tthe old servers stay the same.
BTW, you are correct about there being no way to disable the fans.
The machine will overheat very quickly without them. A fan that
makes less noise will work, but you really should get a three-wire
fan with a tach. You do NOT want a compaq server to keep running
after a fan failure; it will overheat and may never work again.
Clifford Heath
> The computer I am running is a Compaq Proliant 3000 server class
> computer, inside are 2 extremely noisy computer fans +
Sell it to someone to use in a computer room and use the money to
buy a quiet PC, like the DELL I'm typing this on.
Guy Macon
Clifford Heath wrote:
Your Dell doesn't have quad Xeon processors, eight hot-plug SCSI
drives in a RAID array, dual redundant hot-plug power supplies,
or seamless switchover to a backup system upon hardwatre failure.
Ken Taylor
news:11681te...@corp.supernews.com...
>
>
> Joseph wrote:
>
> >The computer I am running is a Compaq Proliant 3000 server class
> >computer, inside are 2 extremely noisy computer fans + the one in the
> >power supply. So 3 noisy fans. Its like you have a vacuum cleaner
> >going at maximum speed. So far I have not found the key switch to
> >allow me into the bios to check this enable/disable mechanism. I am
> >assuming it can't be disable.
>
> On all Compaq machines, you get into the BIOS by hitting F10 when you
> see the blinking square at the top right of the screen during powerup.
>
> Also, your BIOS is on a hard disk partition, not on the motherboard.
> Get yourself a Compaq SmartStart CD on eBay so you can restore it.
> It doesn't matter what version of smartStart; the newer ones handle
> newer servers but the files for tthe old servers stay the same.
Excuse me, on the hard disk partition?? How can it be a BIOS if the HD has
to load it's own driver?
Ken
Clifford Heath
> Your Dell doesn't have quad Xeon processors, eight hot-plug SCSI
> drives in a RAID array, dual redundant hot-plug power supplies,
> or seamless switchover to a backup system upon hardwatre failure.
Of course, but who needs one of those at a workstation?
Put it in the other room and use a smaller machine to access it.
Iwo Mergler
The BIOS is still in ROM/FLASH. The setup program and some sort of
diagnostic tool lives on a disk partition. Hitting F10 at boot time
just redirects to the bootsector of the Compaq partition. It loads
something which looks suspiciously like Windows 3.1.
Kind regards,
Iwo
Guy Macon
Ken Taylor wrote:
>
>"Guy Macon" <_see.web.page_@_www.guymacon.com_> wrote...
>>
>> On all Compaq machines, you get into the BIOS by hitting F10 when you
>> see the blinking square at the top right of the screen during powerup.
>>
>> Also, your BIOS is on a hard disk partition, not on the motherboard.
>> Get yourself a Compaq SmartStart CD on eBay so you can restore it.
>> It doesn't matter what version of smartStart; the newer ones handle
>> newer servers but the files for tthe old servers stay the same.
>
>Excuse me, on the hard disk partition?? How can it be a BIOS if
>the HD has to load it's own driver?
The problem is that you don't know the difference between a BIOS and
a bootloader.
Yes, it is true that BIOS's made by Pheonix and Award contain
bootloaders, but that doesn't make them the same thing.
Compaq systems (the real ones made by the real Compaq - I don't
know about the ones sins HP ate Compaq) have a BIOS thatis
seperate from and loaded by the bootloader.
Ken Taylor
news:Mu39e.114$PG4....@ns2.gip.net...
Which is what I'd expect, and such an obvious mistake devalues what was
otherwise sound advice.
Ken
Guy Macon
Iwo Mergler wrote:
>The BIOS is still in ROM/FLASH. The setup program and some sort of
>diagnostic tool lives on a disk partition. Hitting F10 at boot time
>just redirects to the bootsector of the Compaq partition. It loads
>something which looks suspiciously like Windows 3.1.
These kids today... :)
One could argue that we are simply using different terms for the
same thing, but in my opinion I am using the correct terminology
and you are not. The term "BIOS" was defined by the OS that
invented the first BIOS - CP/M. CP/M had the BIOS on the floppy
with a bootloader in ROM. Compaq followed this pattern, IBM did
not (they put the BIOS in ROM), and most manufactures followed
IBMs lead.
The idea of a bootloader existed long before either CP/M or
it's BIOS were invented. It was originally toggled in to
core memory using front panel switches, and it gave the ability
to fire up the paper tape reader and to start loading the data
on the paper tape into core. (RAM came along and replaced
core later).
Guy Macon
Ken Taylor wrote:
>Iwo Mergler wrote:
>
>>Guy Macon <http://www.guymacon.com/> wrote:
>>
>>>On Compaq machines, you get into the BIOS by hitting
>>>F10 when you see the blinking square at the top right of
>>>the screen during powerup.
>>>
>>>Also, your BIOS is on a hard disk partition, not on the
>>>motherboard.
>>
>> The BIOS is still in ROM/FLASH. The setup program and some sort of
>> diagnostic tool lives on a disk partition. Hitting F10 at boot time
>> just redirects to the bootsector of the Compaq partition. It loads
>> something which looks suspiciously like Windows 3.1.
>
>Which is what I'd expect, and such an obvious mistake devalues
>what was otherwise sound advice.
You should be careful about calling correct information
"an obvious mistake."
I am using the correct terminology and you are making a mistake.
Yours is a common error among those who have never used a computer
other than PC clone.
The program that runs first is called a bootloader, not a BIOS.
See [ http://www.wikipedia.org/wiki/Booting ]. The confusion
came when IBM combined a bootloader and part of a BIOS and
put them in the ROM of the original IBM PC and called it a
"BIOS." (The entire BIOS didn't fit, so part of it was put
in the file io.sys).
Bootloaders existed long before either CP/M and it's BIOS were
invented. The term comes from the term "bootstrapping" which
goes back to the pre-computer phrase "pulling yourself up by your
bootstraps." See [ http://www.wikipedia.org/wiki/Bootstrapping ].
A bootloader can be in Flash, ROM, RAM, core, or even hardware.
The first computer booted from a hardware plugboard.
See [ http://www.columbia.edu/acis/history/eniac.html ].
It had no BIOS because BIOSs (and operating systems!) had not
been invented yet.
The early DEC PDP series booted from a bootloader in core or RAM
that was loaded one location at a time from the front panel.
See [ http://www.psych.usyd.edu.au/pdp-11/bootstraps.html ].
By this time operating systems existed, but BIOSs were yet to be
invented.
The DEC first stage bootloader was originally toggled in to core
or RAM memory using front panel switches, and it gave the ability
to fire up the paper tape reader and to start loading the second
stage bootloader the paper tape, mag tape, or disk. Going directly
to tape/disk involved a cumbersome process of setting up a boot
block, so most users used paper tape for the second stage bootloader.
(There was also a hardware bootloader that was a bunch of discrete
diodes on a PCB - essentially a ROM - but it was rare.
The term "BIOS" is defined by the OS that invented the first
BIOS - CP/M. CP/M had the BIOS on the floppy with a bootloader
in ROM. Compaq followed this pattern, IBM did not (they put the
BIOS in ROM with the bootloader), and most manufacturers followed
IBM's lead.
Apple correctly calls their bootloader in ROM "Firmware" instead
of the incorrect "BIOS." (The correct term for a PC would be
"bootloader and BIOS", but that horse is out of the barn already).
See [ http://www.kernelthread.com/mac/osx/arch_boot.html ]
The next time you think someone is wrong, I suggest a gentle
"I thought that X was true, was I mistaken?". If it turns out
that a mistake was made you can always escalate to flaming
whoever made the mistake, but if you start out with an insulting
tone it becomes quite embarassing for you when it turns out that
it was you who made the error.
--
Guy Macon <http://www.guymacon.com/>
Iwo Mergler
I may be wrong, but AFAIK the BIOS is the "Basic I/O System"
and traditionally offers some rudimentary drivers (floppy,
hdd, keyboard, etc.) which are accessible via software interrupts.
The first PCs even had a BASIC interpreter in int15.
The bootloader makes use of int13 disk services to get at the
bootsector. In DOS, the filesystem is based on int13 functions.
Nobody uses the (real-mode-only) disk services any more, but
other functions have protected mode support. The Linux ACPI
driver, for instance, is just an interface to a BIOS driver.
I understand a bootloader to be a piece of code which sets up
the memory timing, initialises a few devices and loads the OS.
In particular, a bootloader isn't used after the OS starts.
The PC BIOS has all kinds of useful functionality which is
still used by most OSes at runtime.
The Compaq setup utility is not a BIOS. No code from the
Compaq partition ever runs unless you hit F10 at boot time.
I would clasify it as an application instead, which allows
you to set a few flags in the NVRAM for the Bootloader/BIOS
to use on the next boot.
Kind rgeards,
Iwo
Ken Taylor
news:1169stt...@corp.supernews.com...
Sorry, I meant to be a bit less up myself when I started, with an "I could
be wrong", but I did a couple of re-writes before firing it out and it lost
it's saving graces.
So, humble pie in mouth, (by the way, nice history!) are "all" DEC servers
like that? We run a few and I didn't think that was the case. Mind you, on
reflection, if only one drive goes then the redundancy (at least should)
take care of that. I don't think we've had to even go to the install CD for
recovery.
I have vague recollections of salivating while 'helping' out the computer
tech back in college and finally being allowed to fire up the PDP-8. Ah, the
toggle switches. To be able to do that was to be a true geek. Which didn't
matter as there were only guys on campus anyway!
Would you consider that the definition of 'BIOS' has changed over the years
to refer to the firmware that the CPU uses to boot up from, rather than the
boot sector code itself?
Again, apologies for the clumsy post.
Cheers.
Ken
Guy Macon
Ken Taylor wrote:
>Sorry, I meant to be a bit less up myself when I started, with an "I could
>be wrong", but I did a couple of re-writes before firing it out and it lost
>it's saving graces.
No problem; I get that way myself at times.
>are "all" DEC servers like that?
I doubt it, but my experience stops with the PDP-8. As soon as smaller
machines were available for embedded systems, I made the switch.
>I have vague recollections of salivating while 'helping' out the computer
>tech back in college and finally being allowed to fire up the PDP-8. Ah, the
>toggle switches. To be able to do that was to be a true geek.
I can still toggle in the first-stage bootloader from memory. We used
to race each other.
>Would you consider that the definition of 'BIOS' has changed over the years
>to refer to the firmware that the CPU uses to boot up from, rather than the
>boot sector code itself?
Common usage has certainly changed, but there are still many folks
like me who use CP/M on a daily basis, and tend to use the original
definition. Not always, though; I myself used the common usage when
I called the Compaq Diagnostics and Setup Partition a "BIOS"; the
part that does the setting up is part of "BIOS" as redefined by IBM,
Pheonix, and Award, but in CP/M it would be considered a utility.
Then there is Linux, where the usual way of changing a configuration
is to edit a textfile rather than running a program - but x86 Linux
runs on machines that have a IBM/Pheonix/Etc. "BIOS". Interestingly,
good old DOS uses the BIOS to run but Linux/BSD/OS X and Win NT/2K/XP
only use it as a bootloader.
Spajky
>>inside are 2 extremely noisy computer fans + the one in the
>>wer supply. So 3 noisy fans. Its like you have a vacuum cleaner
>>oing at maximum speed. So far I have not found the key switch to
>>llow me into the bios to check this enable/disable mechanism. I am
>>ssuming it can't be disable.
lower Fan speeds by inserting some diodes serially to + (red supply
line) or replace them with 3-wire silent ones; you can find certain
schematics under electronics on my site ... (there´s also a circuit
for 2-wire fans to show RPMs ...
--
Regards , SPAJKY ®
mail addr. @ my site @ http://www.spajky.vze.com
3rd Ann.: - "Tualatin OC-ed / BX-Slot1 / inaudible setup!"