Art Alexion on 20 Oct 2010 06:15:08 -0700

[Date Prev] [Date Next] [Thread Prev] [Thread Next] [Date Index] [Thread Index]

Re: [PLUG] Serial & parallel ports; lack thereof

  • From: Art Alexion <>
  • To: "Philadelphia Linux User's Group Discussion List" <>
  • Subject: Re: [PLUG] Serial & parallel ports; lack thereof
  • Date: Wed, 20 Oct 2010 09:15:02 -0400
  • Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed;; s=gamma; h=domainkey-signature:mime-version:received:received:in-reply-to :references:date:message-id:subject:from:to:content-type :content-transfer-encoding; bh=I1TmPNQPvXY6gYsv92RXdULpABO6gEjVVXIeW4tJwIQ=; b=BXjT/aiP0fYJcw5e9Jn19d7HRZrcWPYsZp5ys/Mej8rJgPXEje/eEXVGmfW6Z42icz 7FuUGeCtGeQ14BF9+GuIyjvGkTSkhVl6KgndXF+hEPKSNaFCOOyGE0WbwCXOkwXtrs+Y vVja8SGy0mgYSqWxyGmD/6aGvgTgXRjT2ST2c=
  • Reply-to: Philadelphia Linux User's Group Discussion List <>
  • Sender:

On Tue, Oct 19, 2010 at 12:13 PM, Richard Freeman
<> 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.

sent unsigned from webmail interface
Philadelphia Linux Users Group         --
Announcements -
General Discussion  --