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Re: [LI] Modem problems



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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