🚀 go-pugleaf

  In short, yes at least two modems should be possible, and likely four.  But
  four will depend on your software.  Com1 and Com 2 should be absolutely no
  problem.
   
  Do you have a serial mouse?  If so this would likely be Com1.  Worst case,
  buy a busmouse and assign it to say, IRQ12.  Com1 could then be one modem 
  on IRQ4, and Com2 could be the second on IRQ3.  This can often be done with
  the modems on different IRQ's but some software doesn't know about anything
  else but IRQ 4 and IRQ3.  Also I've been told never to skip a comm assignment.
  That is never assign Com4 without something on Com3.  I'm not sure I believe
  this, but it is plausible.
/----------------------------------------------------------
/   Keith R. Williams
/   krw@together.net
/   Burlington Vermont

On 18 Mar 1996, tim werner wrote:

> Hi,
> 
> I have been trying to add a 28.8k internal modem to my (Linux) PC box,
> with no success so far, and I'm starting to wonder if it's even
> possible.
> 
> The first thing I thought I would try was to just replace the old 14.4k
> card with the 28.8k, to make sure the new card worked.  This is not
> working.  The docs for the new card say that COM3/IRQ5 is really COM7.
> 
> I don't know what that means.  Is it COM3 or COM7?  And how do I change
> which /etc files to reflect that difference.
> 
> Furthermore, when I tried to disable the second serial port on my I/O
> card, and have both internal modems installed at the same time, there
> seems to be some kind of IRQ contention, even though I thought that was
> sorted out.
> 
> Here is my current configuration, I think:
> 
> I/O card:
>    serial port 1:  COM1 / IRQ 4
>    serial port 2:  disabled (no jumper, instead of selecting COM2 or COM4)
>    printer IRQ:    7
> 
> Internal modem 1 (14.4k):
>    COM3 / IRQ5
> 
> Internal modem 2 (28.8k):
>    COM2 / IRQ3
> 
> When I boot up, the keyboard eventually locks up, and screen save is not
> working, so I think the OS is completely hung.  If I remove the new
> card, I am back to normal.
> 
> 
> So, does anyone have any experience/advice about this?
> 
> 
> thanks,
> tw
> 
> -- 
> The shadow of the bamboo sweeps the steps, but the dust does not stir.
> 


First off, when asking for help,  <g>  make sure, and not I think <g>
anyway, YES you can have multipule modems on a peecee, I ran a bbs
with 5 modems hung from one machine, I know ppl that have had many more
from the same machine, all addressed as serial ports,  If you set
the modem to whatever port, and irq, then that is what you use, dont
worry about Com whatever, since linux only says, this is what it is
in dos, Just set it up to goto that port@irq, it's not hard, i know
that minicom will allow that in it's setup, As for the setup otherwise
im not exactly sure, as of yet I dont have a reason for 2 modems, but
give me time :) and I will..  

Wacci!

In article <WERNER.96Mar18100602@asta.mc.ab.com>,
   werner@asta.mc.ab.com (tim werner) wrote:
>working.  The docs for the new card say that COM3/IRQ5 is really COM7.
>
>I don't know what that means.  Is it COM3 or COM7?  And how do I change
>which /etc files to reflect that difference.

Everyone has a different idea of what COM3 is.  IBM said it was a UART at 3E8H 
using IRQ4, but that conflicts with COM1's IRQ usage.  My hardware background 
says that COM3 is a UART at 3E8H no matter what interrupt it uses, which sort 
of fits in with the PS/2's idea of using IRQ5 (or was it 2/9?) for COM3.  
Windows seems to call the third UART it finds according to a specified search 
pattern COM3, no matter what its I/O and interrupt settings are.

As far as Linux goes, if it says that a modem at 3E8H using IRQ5 should be 
called COM7 and your modem is configured that way, then call it COM7.  SCO 
XENIX/UNIX wouldn't bother giving COMx names to serial ports anyway; tty2A, 
anyone?

>Furthermore, when I tried to disable the second serial port on my I/O
>card, and have both internal modems installed at the same time, there
>seems to be some kind of IRQ contention, even though I thought that was
>sorted out.

Please note that disabling a serial port doesn't always physically disconnect 
the interrupt request driver from the I/O bus.  Ideally, your card has a 
different jumper position for each potential interrupt and no jumper means no 
IRQ line connection.

It's also possible that the conflict is not with IRQs; it may be an I/O port 
conflict, an electrical load or interference problem on the I/O bus, etc.

>Here is my current configuration, I think:
>
>I/O card:
>   serial port 1:  COM1 / IRQ 4
                    ^^^^
Please don't call it COM1; call it 3F8.
>   serial port 2:  disabled (no jumper, instead of selecting COM2 or COM4)
>   printer IRQ:    7
>
>Internal modem 1 (14.4k):
>   COM3 / IRQ5
    ^^^^
3E8?

>Internal modem 2 (28.8k):
>   COM2 / IRQ3
    ^^^^
2F8?

Good luck!

--
            Geoffrey Welsh, Developer, InSystems Technologies Inc.
        Temporary: crs0794@inforamp.net; At work: insystem@pathcom.com
  At home: geoff@zswamp.uucp or [xenitec.on.ca|m2xenix.psg.com]!zswamp!geoff
  Capitalism is a cold-hearted system which guards the interests of whoever's
  at the top, yet hypocritically claims that it offers everyone a fair shot.
              So is every other system ever put in place by man.