[Sussex] Digital IO card

[Richie Jarvis]

Brendan Whelan wrote:
> Hi,
>  
> We have a system which is used in a Blood Transfusion lab. I want to add 
> a digital IO card to a Fedora Core 3 system so that I can flash some 
> alarm lights when the user needs to attend to an urgent request for blood.
>  
> Has anyone recommendation for a simple digital IO card that has a Linux 
> driver.
>  
> Many thanks, Brendan Whelan
Could you not attach a relay to the serial port, and flash a light that way?