The best Wireless Option for the C800 is a PCMCIA card. The C800 didn't have an integrated antenna. The Mini PCI Slot on the C800 is used for the Modem/Ethernet card. The 810 has an integrated antenna (but you have to sacrifice wired Ethernet for Wi-Fi) and the C840's mini PCI slot was intended for a Wi-Fi card. All three were the same chassis but each had slight modifications to the motherboard.
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