Thanks a lot to shahnizam for your comments. Here are some research on your question whether pc cards are an input. PC Card was originally designed for computer memory expansion, but the existence of a usable general standard for notebook peripherals led to many kinds of devices being made available in this form. Typical devices included network cards, modems, and hard disks. The cards were also used in early digital SLR cameras, such as the Kodak DCS 300 series. The original use, as memory expansion, is no longer common.
So as a result, pc card is an input. Without pc card there will be no place for computer memory.