https://www.fark.com/comments/12990054/0#c0
wxboy: These types of signs are well-known for being trivial to “hack”.
Truth. On a business trip to India, the security gate as this MegaCorp factory I was working at had an LED sign, scrolling various info for the workers. I noted it had an old PC-XT 5-pin DIN connector to plug in a keyboard. I watched a guy plug one in and, with one keystroke the display blanked; I took this to mean no username/password required. Just a PC-XT keyboard or a converter for the smaller AT keyboard plug.
All I had with me was USB keyboard and no convertor. So no hijinks on my part. It would have been respectful.
Also, the gate guards had pistols, never would have happened.
