Erik,

sparkfun sells a small device design to read/write scan codes into the ps2 bus:

http://www.sparkfun.com/commerce/product_info.php?products_id=8652

it is based on the atmega168 avr which can be reprogrammed for any number of things. 

alternatively you can use a standard logic analyzer to capture the signals:

http://www.pctestinstruments.com/

Dave aka prpplague

--- On Wed, 2/10/10, Erik Andrén <erik.andren@gmail.com> wrote:

From: Erik Andrén <erik.andren@gmail.com>
Subject: PS/2 sniffer for windows
To: linux-input@vger.kernel.org
Date: Wednesday, February 10, 2010, 11:20 AM
Hi,

What is the easiest way to reverse engineer a windows
driver using the ps/2 bus?
Are there any ps/2 sniffer software which one can acquire?

Best regards,
Erik
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