[lkml]   [1997]   [Oct]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe:Using both serial ports at the same time, Summary please ...
At 12:16 PM 10/12/97 -0700, Mr. James W. Laferriere Network Engineer wrote:
> Hello Nicholas, Please be kind & post a summary ? Tia, JimL

Ok, it was pretty straight forward:

The problem
I could only open and use 1 serial port of my 2 built in ones at the same
time. They were set for the normal IRQ' and ports for COM1 & COM2.

If I had one open (say a PPP connection) and attempted to use the other
(say, as a serial terminal [agetty ttyS1 9600]), both would SLOW DOWN to
amazing levels (like 10 characters per minute).

As soon as I closed either port, the other would come back up with no
problems and no errors.

All the time, the kernel never reported any problems. I did not test this
under any other OS than Linux as I don't have any other installed on that box.

I tried in my AMI bios to move the serial ports to various other settings
(ie, COM1-COM4) to no effect.

The solution
I put in an internal modem into my 'puter, set it as COM3 and dialed out to
my PPP account.

I then attempted to use on of the two inboard ports. No problems!! If I
tried using all three, the two built-in ones would exhibit the same problem
as before, but the third would happily buzz along.

The Results
My mobo's serial ports are fried :( I traded my external 36.6 modem for an
internal variety and everything works as expected.


simple is elegant

 \ /
  Last update: 2005-03-22 13:40    [W:0.022 / U:15.280 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site