What are the differences between Type I, Type II, and Type III PC Cards?
The difference between Type I, II, and III cards are the mechanical dimensions of the PC Card. All PC Cards measure the same length and width, roughly the size of a credit card. Where they differ is in thickness. Type I, the smallest form factor, often used for memory cards, measures 3.3mm in thickness. Type II, available for those peripherals requiring taller components such as LAN cards and modems, measures 5mm thick. Type III is the tallest form factor and measures 10.5 mm thick. Type III PC Cards can support small rotating disks and other tall components. Smaller size cards can always fit into larger sockets but the reverse is not always true. • Why were PC Cards originally introduced? PCMCIA’s 16-bit PC Cards were introduced primarily for the mobile computing environment to provide a small form-factor, low-power alternative to the much larger and power hungry ISA peripheral devices employed in most PCs. Memory card support was defined first, followed by I/O Cards. The PC Card Stan
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