[1521] in RedHat Linux List
Re: Adding more serial ports
daemon@ATHENA.MIT.EDU (Allen Francom)
Mon Oct 28 20:14:32 1996
Date: Tue, 29 Oct 1996 08:03:54 -0800 (PST)
From: Allen Francom <afrancom@numedics.transport.com>
To: redhat-list@redhat.com
cc: redhat-list@redhat.com
In-Reply-To: <32754E68.4BFABDD1@iceonline.com>
Resent-From: redhat-list@redhat.com
Reply-To: redhat-list@redhat.com
There are "AST Fourport Cards" which I've used successfully with Linux.
They each drive, of course, four com ports, but with ONE IRQ per board only.
This actually works out quite well, because the CPU can catch more than
one char per card per interrupt this way. There's a little register that
says, "This and this and this port have a char ready" when the interrupt
fires.
I think that these are really cheap, and there are clones. They are
based on traditional UART technology. Appx $80 each, maybe less.
I have two of these running in a Linux box, Kernel 1.2.1 - forgive me -
THX
-AEF
On Mon, 28 Oct 1996, BORG wrote:
> Robert Hart wrote:
> >
> > Hi
> >
> > I have noticed a couple of people have had problems with adding serail
> > ports above cua1 (ie standard DOS com ports com3 and com4) - problems with
> > mouse and modem on cua0 and cua1.
>
> Yes, I did have such a problem, even worse, I couldn't
> use cua3 (com4) because my videocard told me it wanted
> 0x03e8 to be empty otherwise it would complain. :)
> My setup is like following:
>
> /dev/cua0, UART: 16550A, Port: 0x03f8, IRQ: 4 (modem #1)
> /dev/cua1, UART: 16450, Port: 0x02f8, IRQ: 3 (M$ mouse)
> /dev/cua2, UART: 16550A, Port: 0x02e8, IRQ: 5 (Modem #2)
> /dev/cua3, UART: unknown, Port: 0x03e8, IRQ: 3 (nothing)
>
> All I had to do was change jumpers on my serial
> card accordingly to a little manual that came with it
> and set jumpers on my modems accordingly. Took me
> a couple of days or so to figure everything out until
> I could make all 3 devices work simultaneously
> without sharing each other resources and locking up.
>
> Regards,
> Vlad
>
> --
> *** #include <disclaimer.h> ***** Good pings come in small packets
> ******** Vlad Petersen ********** ********************************
> *** <vladimip@iceonline.com> **** **** Linux: OS I can trust *****
> ******** Vancouver, B.C. ******** ********************************
>
>
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