From: Daniel Phillips <phillips@arcor.de>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: vda@port.imtp.ilyichevsk.odessa.ua,
Andrew Rodland <arodland@noln.com>,
Stas Sergeev <stssppnn@yahoo.com>,
linux-kernel@vger.kernel.org
Subject: Re: [ANNOUNCE] New PC-Speaker driver
Date: Thu, 15 Aug 2002 13:28:03 +0200 [thread overview]
Message-ID: <E17fInL-0002b6-00@starship> (raw)
In-Reply-To: <1029409051.29816.1.camel@irongate.swansea.linux.org.uk>
On Thursday 15 August 2002 12:57, Alan Cox wrote:
> There are easier equivalent ways to accurately measure the IRQ
> behaviour. Flip the state of a parallel port pin when you mask
> interrupts. You can even slap an oscilloscope on it that way
Right, I'll just go get my oscilloscope now...
In fact I relied on the technique you mentioned a great deal when
I was doing realtime work with PCs. With a multi-trace digital
scope the effect is something like a poor-man's logic analyser
with a resolution of 10 us or so.
Another technique I can recommend highly is panicking by halting
in a tight loop with the speaker set to emit some tone. It may
be annoying for the guy at the next bench but in some code, such
as transitioning to/from virtual86 mode, there aren't a lot of
alternatives.
--
Daniel
next prev parent reply other threads:[~2002-08-15 11:22 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-08-14 16:58 [ANNOUNCE] New PC-Speaker driver Stas Sergeev
2002-08-14 22:44 ` Andrew Rodland
2002-08-15 13:18 ` Denis Vlasenko
2002-08-15 10:42 ` Daniel Phillips
2001-11-02 1:25 ` Pavel Machek
2002-08-15 10:57 ` Alan Cox
2002-08-15 11:28 ` Daniel Phillips [this message]
2002-08-15 16:34 ` Denis Vlasenko
2002-08-15 11:55 ` Daniel Phillips
2002-08-15 14:34 ` Helge Hafting
2002-08-18 8:49 ` Daniel Phillips
2002-08-16 7:30 ` Albert D. Cahalan
-- strict thread matches above, loose matches on Subject: below --
2002-08-31 13:28 Stas Sergeev
2002-08-16 16:19 Stas Sergeev
2002-08-15 14:34 Stas Sergeev
2002-08-26 11:21 ` Pavel Machek
2002-08-26 18:33 ` Thunder from the hill
2002-08-14 23:28 Stas Sergeev
2002-08-15 10:46 ` Daniel Phillips
2002-08-14 16:46 Stas Sergeev
2002-07-29 9:29 Stas Sergeev
2002-08-14 16:06 ` Denis Vlasenko
2002-08-14 11:33 ` Michael Knigge
2002-08-14 12:24 ` David Woodhouse
2002-08-14 23:14 ` Daniel Phillips
2002-08-14 23:19 ` Daniel Phillips
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