Type I or type II?

How do you determine if a PCMCIA card is type I or type II?
I have an older laptop that I need to purchase a NIC for but don’t know if it is a which type it is.
I have a Xircom CreditCard Ethernet 10/100+ Modem 56 and it fits into the slot.
Unfortunately, there are no drivers for the antiquated OS this machine has loaded.
If I knew which type of card this is, I would know which kind the laptop requires and could buy an appropriate card.