Re: hotplug PS2 keyboard

From: Pigeon (jah.pigeon_at_ukonline.co.uk)
Date: 09/06/04

  • Next message: Pigeon: "Re: hotplug PS2 keyboard" 
    Date: Mon, 6 Sep 2004 00:11:19 +0100
To: debian-user@lists.debian.org

    On Sat, Sep 04, 2004 at 07:14:30PM -0700, Paul Johnson wrote:
    > Pigeon <jah.pigeon@ukonline.co.uk> writes:
    >
    > > Sorry, but I have to disagree. I've booted PS/2 systems without keyboards
    > > and plugged them in later, without any problem.
    >
    > You have weird hardware, then. 8:o)

    Off the top of my head... Intel 440BX, VIA 82CXXX, SiS 746FX all do it
    without complaint. The PS/2 interface is so electrically simple that
    there's really no reason why hot-plugging it shouldn't work, as long
    as the keyboard has a sufficiently long reset delay that it doesn't
    come alive before the "cchhcccch" of making the connection has
    finished.

    This is not always the case - I've done it with a Dell keyboard where
    apparently the keyboard's own microcontroller crashes due to dirty
    power lasting longer than the reset delay, and can be brought back to
    life by unplugging it for a few seconds then plugging it in again
    more deftly.

    Having said that I guess it would be possible to incorporate the
    assumption that the interface wouldn't be hot-plugged into the design
    in such a way that it became inescapable. Probably wouldn't happen if
    I was designing it but not everybody thinks like me. :-) 

    -- 
Pigeon
Be kind to pigeons
Get my GPG key here: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x21C61F7F



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