From: Dave Dillow <dave@thedillows.org>
To: linux-os@analogic.com
Cc: Linux kernel <linux-kernel@vger.kernel.org>
Subject: Re: keyboard timeout
Date: Wed, 01 Dec 2004 18:05:09 -0500 [thread overview]
Message-ID: <1101942309.6166.16.camel@dillow.idleaire.com> (raw)
In-Reply-To: <Pine.LNX.4.61.0412011721090.8835@chaos.analogic.com>
On Wed, 2004-12-01 at 17:29, linux-os wrote:
> If Linux 2.6.9 is booted on a 40 MHz `486 with the standard
> ISA clock of 14.3 MHz (yes that's the standard), the kernel
> will complain about a keyboard timeout for every key touched!
Umm, no.
The BCLK signal, which is the system bus clock, is 4.77, 8.0, or 8.33
MHz, depending on platform. There may be other non-standard frequencies
in use. Since everything is referenced to this signal, I'd call it the
ISA clock.
You may be thinking of the OSC signal, which is 14.33MHz, and was used
to generate the composite video signal on early CGA cards. It is not
synchronized to any other signal. It is (was) also often divided by 12
and fed to the 8254 PIT.
As for your keyboard problem, I dunno. I just wanted to play "The find
the subtle misconception in Dick's post" game.
My reference: "ISA & EISA Theory & Operation" by Edward Solari.
--
Dave Dillow <dave@thedillows.org>
next prev parent reply other threads:[~2004-12-01 23:05 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-12-01 22:29 linux-os
2004-12-01 23:05 ` Dave Dillow [this message]
2004-12-02 13:13 ` linux-os
2004-12-02 16:07 ` Dave Dillow
2004-12-02 23:38 ` Alan Cox
2004-12-01 23:45 ` Alan Cox
2004-12-02 13:11 ` linux-os
2004-12-02 14:13 ` Alan Cox
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1101942309.6166.16.camel@dillow.idleaire.com \
--to=dave@thedillows.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-os@analogic.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®