An ExpressCard is an interface to allow peripheral devices to be connected to a computer, usually a laptop computer. ExpressCards is a hardware standard replacing PC cards or PCMCIA cards. The host device supports both PCI Express and USB 2.0 connectivity through the ExpressCard slot.
The Expresscard module comes in two sizes. Expresscard/34 is 34 mm wide, while Expresscard/54 is 54 mm wide. The modules are both 5 mm high and 75 mm long. The 34 mm module has the advantage in that it can fit into the slot designed for the 54 mm card, but not vice versa.
The Expresscard simply slots into a USB interface that is already integrated into most desktop computers and notebooks.
ExpressCard slots are hot-pluggable, which means they can be activated by connecting them directly without shutting down the computer.
CardBus is the latest enhancement to the PCMCIA 5.0 or later. PMCIA stands for Asociación Internacional de Tarjetas de Memoria. CardBus was introduced in 1995 and present in laptops from late 1997 onward. The main purpose of CardBus was to extend the existing PCMCIA bus to allow more powerful devices, and also provide support for 32 Bit I/O.
PCMCIA is the short for Personal Computer Memory Card International Association. It is pronounced as separate letters. PCMCIA is also known as PC Card.
PCMCIA was originally designed for adding memory to portable computers, the PCMCIA standard has been expanded several times and is now suitable for many types of devices
The primary advantage of AGP over PCI is that it provides a dedicated pathway between the slot and the processor rather than sharing the PCI bus. In addition to a lack of contention for the bus, the point-to-point connection allows for higher clock speeds.
PCI-X is the upgraded version of PCI. It differs mainly in the fact that the PCI-X bus is 64-bits wide, and runs at higher frequencies of up to 533MHz, compared to PCI frequency that runs up to 66MHz.
AGP Pro was launched in 1998 as an AGP interface extension specification for advanced workstations. AGP Pro bus is a specification that provides a direct connection between the graphics adapter and memory.
ISA is an old technology that has been replaced by PCI, PCIe and so on. ISA slots are usually black, long and the gold contacts are large.
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