Re: [LI] Modem problems

["Vaibhav Patkar" <vaibhav31@xxxxxxxxxxx>]

Dear Amol

Normally a mother boards gets +5V, -5V, +12V, -12V supply from the SMPS. It 
could happen that these voltages are not fully achieved i.e you may get +10V 
or -9V. Now it depends on the OS to recognize wheather it is Logic high or 
Logic low condition for the interface to work. Normally serial port works 
with +12V and -12V. It is possible that the SMPS is not giving proper -12V. 
Assuming it is -10V though Windows recognizes it as proper com port but 
Linux does not. The problem cannot be with +12V as your CDROM drive, Hard 
disk drives works ok.

Hope this help.

Vaibhav


>         Boy, you are spot on. I do have an genuine Intel 440 BX 
> Motherboard.
> I don't understand what the relation is. Weird if you ask me. I will give 
> it
> a shot. Could you do me a favour? Please ask that H/W engineer what is the
> logic behind the solution.
> Amol
> ----- Original Message -----
> From: Syed Khader Vali <sidcarter@xxxxxxxxxxxx>
> To: <linux-india@xxxxxxxxxxxxxxxxxxxxx>
> Sent: Sunday, October 31, 1999 9:27 AM
> Subject: Re: [LI] Modem problems
>
>
> > On Fri, Oct 29, 1999 at 10:37:21PM +0530, Amol Gokhale wrote:
> > =>         I have narrowed down the problem. It's my com2. Does'nt work
> under
> > => Linux. Doesn't matter what you put on it, modem mouse. Any body know
> why a
> > => perfectly good com port can work under one os & not work under the
> other.
> > Hello there,
> > >From what you say, It looks like you have a genuine Intel 440BX
> motherboard
> > or whatever. This motherboard seems to have a problem with the port 
> thingy
> > at least in Linux, it had some problems. I dunno about windows.
> > Can you check out with your hardware dealer and have the SMPS changed
> > ( well that was what our guy did to make it work, god knows what 
> relation
> > they have ;-)
> >

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