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Re: [PLUG] Serial & parallel ports; lack thereof
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- From: Art Alexion <art.alexion@gmail.com>
- To: "Philadelphia Linux User's Group Discussion List" <plug@lists.phillylinux.org>
- Subject: Re: [PLUG] Serial & parallel ports; lack thereof
- Date: Wed, 20 Oct 2010 09:15:02 -0400
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- Reply-to: Philadelphia Linux User's Group Discussion List <plug@lists.phillylinux.org>
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On Tue, Oct 19, 2010 at 12:13 PM, Richard Freeman
<r-plug@thefreemanclan.net> wrote:
>
> On 10/19/2010 08:35 AM, Eric H. Johnson wrote:
> > You are correct on both points, it was me that said that and USB devices
> > cannot be used for hard real-time. PCI based parallel port boards often can
> > work, but that is little help when dealing with a laptop having neither a
> > parallel port nor PCI bus.
> Honestly, if you're interested in real-time, then an OS designed for
> this should be used. I think linux can be used in this capacity, but in
> some cases there are better tools for the job.
>
> In theory a PC can be a good realtime platform. A realtime OS would
> probably start by ditching the BIOS completely (just wipe out the IDT
> and write your own low-level routines). Realtime operations really
> requires a bare-hardware level of engineering.
>
The problem isn't just real time, but we have a number of switches
that can only be configured via a serial connection. And it is much
more cumbersome to do this via desktops and servers than a laptop we
can carry to the rack mounted switch.
--
artAlexion
sent unsigned from webmail interface
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