[XCSSA] more info on the chassis intrusion lead

[xcssa@xcssa.org]

On Monday 11 September 2006 10:41, xcssa-admin@xcssa.org wrote:
> I think I found a trivial flaw in some, if not all, chassis intrusion
> sensors.
>
> Basically, to signal "chassis open" you raise the chassis signal lead to
> +5V. When the chassis is closed, it shorts to ground.
>
> The hole is obvious; unplug the system, no more +5V.
>
> Fixing this by installing a 9V battery or large capacitor
> is left as an exercise for the reader.

Isn't that a bit like turning off your alarm clock by shoving a paper click in 
the outlet? hehe..

Tweeks