Acer Aspire 1640 - Manual (Page 56)

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English
The computer's IEEE 1394 port allows you to connect to an IEEE 1394-supported
device, like a DVD/CD-RW combo or DVD-Dual drive.
PC Card slot
The Type II PC Card slot of the computer accepts PC Cards that enhance the
usability and expandability of the computer. These cards should have a PC Card
logo on them.
PC Cards (formerly PCMCIA) are add-on cards for portable computers, giving
you expansion possibilities long afforded by desktop PCs. Popular PC Cards
include flash, fax/data modem, WLAN and SCSI cards. CardBus improves on the
16-bit PC card technology by expanding the bandwidth to 32 bits.
Note: Refer to your card's manual for details on how to install and
use the card and its functions.