Originally PC card 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 PC Card has a 68-pin connector that connects into a slot in the PC. There are four types of PC cards.
Type I PC card feature is a 16-bit interface. They are 3.3 mm thick and feature a dual row of 34 holes (68 in total) along a short edge as a connecting interface. Type-I PC Card devices are used for memory devices such as RAM, flash memory, OTP (One-Time Programmable), and SRAM cards.
Type-II and above PC Card devices use two rows of 34 sockets, and feature a 16- or 32-bit interface. They are 5.0 mm thick. Type-II cards introduced I/O support, allowing devices to attach an array of peripherals or to provide connectors/slots to interfaces for which the host computer had no built-in support.
Type-III PC Card devices are 16-bit or 32-bit. These cards are 10.5 mm thick, allowing them to accommodate devices with components that would not fit type I or type II height.
Type-IV cards, introduced by Toshiba, have not been officially standardized or sanctioned by the PCMCIA these cards are 16 mm thick.
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