Card Types
All PC Card devices use a similar sized package which is 85.6 mm long and 54.0 mm wide, the same size as a credit card. The form factor is also used by the Common Interface form of Conditional Access Modules for DVB broadcasts, and by Panasonic for their professional "P2" video acquisition memory cards.
The original standard was defined for both 5 volt and 3.3 volt cards, with 3.3 V cards having a key on the side to prevent them from being inserted fully into a 5 V-only slot. Some cards and some slots operate at both voltages as needed. The original standard was built around an 'enhanced' 16-bit ISA bus platform. A newer version of the PCMCIA standard is CardBus (see below), a 32-bit version of the original standard. In addition to supporting a wider bus of 32 bits (instead of the original 16), CardBus also supports bus mastering and operation speeds up to 33 MHz.
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