The PC card slot is also a standard equipment for notebook computers like the VGA output port. The PC card is an industrial standard (PCMCIA specification) and is widely used in many medium-sized digital equipment and industrial control equipment. on.
It can be said that before the emergence of plug-and-play ports such as USB and IEEE1394, the PC card slot was the only port on the laptop that truly supported plug-and-play, and because the PCMCIA specification was widely supported, PC cards The products can be described as numerous, providing a wide variety of expansion options for notebook computers.
The PC card slot is equivalent to the PCI slot of a desktop computer. The difference is that the PC card slot is plug-and-play, allowing the PC card device to be stopped while the operating system is running. There are three types of PC cards, Type I / II / III, according to their appearance. The length and width of the three are 85.6 × 54mm, the difference is the thickness, TypeI is 3.3mm, Type II is 5.0mm; Type III is 10.5mm, they The interface is exactly the same, all are 68 pins, so as long as the thickness of the PC card slot allows, the three specifications of the card can be used universally.
The difference in thickness is due to the different requirements of the built-in equipment. For example, the memory can be placed in the thinnest Type I card, but the mini hard disk needs at least the thickness of the Type II or Type III card to accommodate it. All Type II slots are used in laptops. Two Type II slots can be stacked to accommodate Type III cards. Most mainstream optical and soft interchangeable models and fully built-in models are equipped with 2 Types. II slot, most ultra-thin machines are only equipped with a Type II slot.
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