From: stevev@miser.uoregon.edu (Steve VanDevender) Subject: serial IRQ conflict Date: 9 May 1993 02:03:24
I recently obtained an internal modem for my Linux box. Since
after installing this I freed up a serial port, I decided to try
hooking up my previous computer as a terminal.
The original settings on the board had it as COM3, IRQ 4.
However, the IRQ setting was the same as ttyS0, which my mouse was
hooked to, and this made the mouse unusable in X, so I switched
the modem to IRQ 3. This made it possible to use both the mouse
and the modem at the same time, but now the modem conflicts with
ttyS1 which is also on IRQ 3.
I would like to either find a way to eliminate the conflict
between the modem and the second serial port or find a way to
quickly start and kill a getty on ttyS1. Using /etc/inittab I
can start a getty at init time that respawns whenever it is
killed, or start a getty on demand that also respawns from that
time on, but the only way I can remove the getty is to edit
/etc/inittab to remove it and "init q". If I could at least
conveniently switch between using the modem or the terminal I
would be happy.
A secondary problem is that I can't seem to get the hardwire
terminal connection to work at 19200 baud. The modem, however,
has no trouble with 38400 baud when I use Seyon (the modem is
V.32/V.42bis).