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Date:      Mon, 22 Aug 2011 18:33:43 -0500 (CDT)
From:      Robert Bonomi <>
Subject:   Re: What dialup modem WILL work with 8.x and uart?
Message-ID:  <>
In-Reply-To: <alpine.BSF.2.00.1108221753450.1513@abbf.6qbyyneqvnyhc.pbz>

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> From  Mon Aug 22 17:55:46 2011
> Date: Mon, 22 Aug 2011 17:53:55 -0500 (CDT)
> From: Lars Eighner <>
> To: Robert Bonomi <>
> Cc:,
> Subject: Re: What dialup modem WILL work with 8.x and uart?
> On Mon, 22 Aug 2011, Robert Bonomi wrote:
> > Even 'sio' support of "PCI serial ports" and/or modems was -very-limitid.
> > precisely *two* models of cards -- The 3Com FaxModem PCI and the Advantec
> > 56k Voice Messaging PCI FaxModem.
> That's why I sprang for the 3Com which WAS supported by sio for years and is
> NOT supported by uart since 8.x.  Why it is this device could be supported
> for so many years, but somehow it is impossible on 8.x? 

The answer is "because it *iS*".  Whether or not you understand 'why' does't
change that real-world FACT.

The world changed.  The old driver -doesn't- work any more.  Because of
architectural changes to other parts of the system.

At some point in history, there was 'someone' who was 'interested enough'
in supporting those 2 PCI cards to actually sit down and write code for
the then-existing driver architecture.

Time passed, that person is no longer around.

>                    but somehow it is impossible on 8.x? It's not as if
> dozens of new such devices from dozens of new vendors are flooding the
> market.  It's the same thing it ever was.
> > Supporting serial controllers across a PCI bridge takes lots of work. and
> > does *not* 'generalize' well.
> >
> > If I were in your situation, I'e look at a USB serial port and external
> > RS-232 modem.
> I'll look at anything, but if I have to buy something, I want to know it is
> actually IS working with uart, not that sort of should've.


If it is a USB serial port, it _doesn't_ use the uart driver.  And you avoid
any limitations that it might have.

>                                                             Uart should've
> sort of been a "drop-in replacement" for sio - "drop-in repIacement" were
> the exact words used when I asked about it the first time I heard sio was
> being dropped and was assured uart would be a "drop-in replacement." But it
> is not, so theoretical "ought to work"s are not helpful. I'm looking for
> really actually does work.

You've been told what actually does work.  I'm running 8.2 on several
machines -- *with* working serial ports that live directly on the legacy
ISA bus.  Using only the standard kernel drivers.  And doing PPP over 
those ports.  I'm not using a modem, just a null-modem cable but I could
swap in a pair of _any_ type of hardware modems.

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