What do you think what is pcmcia?
Our electronic definitions web site has answer for that as well:
personal computer memory card international association. There are three versions of PCMCIA cards. All three have the same rectangular size (85.6 by 54 millimeters), but different widths though:
Type I cards can be up to 3.3 mm thick.
Type II cards can be up to 5.5 mm thick, used for modem and fax modems.
Type III cards can be up to 10.5 mm thick.
See www.pcmcia.org for more.
Other electronic terms somewhat related to pcmcia