Question Does a diagnostic card works

[Hello Guys]

So when I was browsing on the internet about computer i stumble upon a "diagnostic card" i have no idea what it is does but when search more about it i found out is something about post code it look interesting but does it's work.

https://www.google.com/imgres?imgur...9g4dzZWeM&w=420&h=450&hl=en-US&source=sh/x/im

 

[kerberos_20]

they do work, but this one is a little bit old, ISA / PCI slots arent used anymore
u should look for USB version, as they can debug any computer device (tablets/smart phones aswell) without opening them, but they shouldnt be available in open market
https://en.wikipedia.org/wiki/POST_card

 

[Hello Guys]

Well Its for my PC

But thanks.

 

[Hello Guys]

Also there an LCD screen one instead of digit