[WriteLog] WriteLog, shared IRQs and COM ports

[Robert Peterson]

Eric -  I want to echo Clive's comments.  Although I can't remember a
specific IRQ sharing experience involving WriteLog, I do remember many
instances when I noticed IRQ's were being shared.  The computer always
handled it without any problems.  I'm assuming that systems that allow IRQ
sharing have some way of telling which device requested the interrupt and
activate the appropriate interrupt handler.  The actual IRQ number is not
the limiting factor that it used to be.  73, Bob - W3YY
----- Original Message -----
From: "Clive Whelan" <gw3njw@onetel.net.uk>
To: "Eric Scace K3NA" <eric@k3na.org>; "WriteLog" <writelog@contesting.com>
Sent: Tuesday, January 07, 2003 7:16 PM
Subject: Re: [WriteLog] WriteLog, shared IRQs and COM ports


>
>
>
> Eric
>
>
>
> > I have access to a computer with lots of COM ports, but some of these
ports share IRQs.  WinXP Pro is the operating system.  Has
> > anyone used WriteLog with COM ports under shared IRQs?  My understanding
of how this works at an operating system and application
> > level is pretty murky.
> >
>
>
> I am doing just that, and it works  fine. In fact I was extremely puzzled
that on installation
> , the PCI serial port card ( ITe), the on board sound card, and the on
board ( PC Chips) ethernet
> were all sharing IRQ11, but no conflicts were reported. In fact the serial
port card did not work at first, but on
> disabling the network in the BIOS it did then work. On re-enabling the
network, all three co-existed despite the fact that
> apparently none of the IRQs  had changed, and there appeared to be a
conflict, although XP didn't think so.
>
> This appears to be pure black magic, and I have given up trying to
understand it, and just rejoice!
>
>
> 73
>
>
>
> Clive
> GW3NJW
>
>
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