On Fri, 11 Jan 2008 11:42:23 -0800 (PST), PeteOlcott
<PeteOlcott@gmail.com> wrote:
>> Try keyboard with another system. *Try another keyboard with
>> that system.
>>
>> Yes a USB keyboard should still work, it is only coincidence
>> it is a keyboard as the port is different.- Hide quoted text -
>>
>> - Show quoted text -
>
>Would both types of keyboard interfaces (USB and PS2) use the same
>keyboard controller on the motherboard?
No, the PS2 ports generally have the controller in the
superIO chip. The USB ports are a separate controller which
is (depending on the age of the board) in a discrete USB
controller on older boards or the soutbridge (or northbridge
on single chip, chipsets) on newer boards.
On Fri, 11 Jan 2008 12:45:04 -0800 (PST), Andrew
<andrews@sdf.lonestar.org> wrote:
>On 11 Jan, 17:16, kony <s...@spam.com> wrote:
>> On Fri, 11 Jan 2008 07:39:30 -0800 (PST), PeteOlcott
>>
>> >Already did it, and trying to see if this is the cause of my problems.
>> >What problems can this cause? If this is the cause of my problems
>> >would replacing the keybarod with a USB keyboard fix the problem?
>>
>> Try keyboard with another system. Try another keyboard with
>> that system.
>
>Best not to risk doing that. Although it's never happened to me I
>have heard stories (from trustworthy sources) of damage being passed
>from system to system in this manner.
It is possible but IMO, if one were to always throw away any
suspect part instead of retrying it, there would be a lot of
trash unnecessarily.
>The keyboard is unplugged and
>the system is damaged. The system then damages any keyboard plugged
>into it.
Not likely. If the keyboard controller were damaged it
would just not work with another keyboard, not damage
another keyboard.
>The damaged keyboard then damages any system it is plugged
>into.
While possible, it is also unlikely... remembering that the
two parts did work together already, rather than one or the
other being grossly defective.
> For a cheap keyboard I doubt it's worth the risk. If you had a
>premium or particularly treasured keyboard, maybe - keyboards are
>highly personal things after all - but test it on a scrapper first.
>I'd generally throw out the keyboard as a bad risk and seal off the
>mobo's keyboard port with e.g. epoxy to prevent anything being
>inserted in future. Just make sure it isn't one of those graphite or
>silver loaded conductive epoxies.
Seems a bit extreme. When the controller is damaged it's
just be the logic circuit burnt out which doesn't generally
subject connected parts to damage. It might be different if
it were a manufacturing defect.
>> USB has alwasy been hot pluggable so you're safe to
>> plug in whenever you like.
>
> There are several exceptions to that. You can certainly plug it in, but
> the results will be far less than satisfactory.
>
> http://www.dkimages.com/discover/pre...751/956536.JPG
***** again!
--
Peter.
You don't understand Newton's Third Law of Motion?
It's not rocket science, you know.
"Peter Olcott" wrote:
> Can the keyboard be safely unplugged, and plugged back in with the power
> turned on?
While not a good idea, I've done it on about every system I've ever owned.
The current one falls out every few weeks or so, at which time I plug it
back in and go about my business.
The only thing that is noticeably different is that the typematic rate
changes, at least until the next boot.
Peter Olcott wrote:
>
>Can the. keyboard be safely unplugged, and plugged back in
>with the power turned on?
>
You can usually get away with it, but except for the USB ports, the
hardware isn't designed to tolerate that because its chips can't
handle current surges very well, and there are almost no protection
devices placed between the MOS chips and outside world. The situation
was usually better with old designs, where every outside connection
would have a resistor in series (and perhaps an inductor), a capacitor
to ground, and be clamped to ground through a diode and clamped to Vcc
through a zener diode. And between those components and the expensive
chips would often be a generic buffer chip that was not only rugged
but could be replaced inexpensively.
On 2008-01-11, kony <spam@spam.com> wrote:
> On Fri, 11 Jan 2008 12:45:04 -0800 (PST), Andrew
><andrews@sdf.lonestar.org> wrote:
>
>>The keyboard is unplugged and
>>the system is damaged. The system then damages any keyboard plugged
>>into it.
>
> Not likely. If the keyboard controller were damaged it
> would just not work with another keyboard, not damage
> another keyboard.
I agree it is unlikely and it has certainly never happended to me
personally, however it _has_ happened that way in the past. At
the very least it is an issue to be aware of, save you end up
destroying more and more equipment in the attempt to diagnose what
has gone wrong. A simple £10 fix for a new USB keyboard could end
up costing hundreds.
>> For a cheap keyboard I doubt it's worth the risk. If you had a
>>premium or particularly treasured keyboard, maybe - keyboards are
>>highly personal things after all - but test it on a scrapper first.
>>I'd generally throw out the keyboard as a bad risk and seal off the
>>mobo's keyboard port with e.g. epoxy to prevent anything being
>>inserted in future. Just make sure it isn't one of those graphite or
>>silver loaded conductive epoxies.
>
> Seems a bit extreme. When the controller is damaged it's
> just be the logic circuit burnt out which doesn't generally
> subject connected parts to damage. It might be different if
> it were a manufacturing defect.
I do see another possibility, using a disposable keyboard (a £5
type, or one that has been replaced because some of the keys are
tempremental) to test the system. If it works, great, you've
isolated the problem which was the original keyboard and it needs
junking. If not, then conservately regard _both_ keyboards as
suspect and junk them and block of the port (now known to be
defective) to prevent any further possibility of damage.
"kony" <spam@spam.com> wrote in message
news:uv2fo3taj7o7av424rd95jab1td6t6rudg@4ax.com...
> On Fri, 11 Jan 2008 07:24:39 -0800 (PST), PeteOlcott
> <PeteOlcott@gmail.com> wrote:
>
>>On Jan 11, 8:30 am, Conor <conor_tur...@hotmail.com> wrote:
>>> In article <hyKhj.43459$1C4.35...@newsfe10.phx>, Peter Olcott says...>
>>> Can the keyboard be safely unplugged, and plugged back in
>>> > with the power turned on?
>>>
>>> USB, yes. PS2 - well some can and some can't. Usually it buggers up the
>>> motherboard PS2 port.
>>>
>>> --
>>> Conor
>>>
>>> I'm not prejudiced. I hate everyone equally.
>>
>>Meaning that it damages the motherboard PS2 port?
>
> Meaning that it could, but more often the problem is it
> isn't designed to be redetected.
>
> Simple answer - don't do it.
Indeed! I' ve done it before (PS2 port on old Asus CUSL2-C)) and the
keyboard controller was definitively dead. Fortunately, I could still use an
USB kbd.
Re: Is the keyboard hot pluggable? 
Linear Mode
