Dell WorkStation 210 manual 23RUWVDQG&RQQHFWRUV, SERIAL1/2, SLOT1PRI, SLOT1SEC, Usb

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SERIAL1/2	Serial port connectors (sometimes referred to
	as COM1 and COM2; stacked)
SLOT1_PRI	Primary Pentium II processor SEC cartridge
	connector
SLOT1_SEC	Secondary Pentium II processor SEC cartridge
	connector
USB	USB connectors

NOTE: For the full name of an abbreviation or acronym used in this table, see the Glossary.

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The I/O ports and connectors on the back panel of your computer are the gateways through which your computer system communicates with external devices, such as a keyboard, mouse, printer, and monitor. Figure B-2 identifies the I/O ports and connec- tors for your computer.

video connector (may be in bottom or second expansion slot)

No PCI expansion slot connector exists behind this slot cover.

parallel port	serial port 1		mouse	keyboard	USB
				connector
connector	connector		connector		connectors
	connector)LJXUH%￿￿￿		,￿23RUWVDQG&RQQHFWRUV		line-in jack	NIC connector
	serial port 2	microphone jack		line-out jack
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The two built-in serial ports use 9-pin D-subminiature connectors on the back panel. These ports support devices such as external modems, printers, plotters, and mice that require serial data transmission (the transmission of data one bit at a time over one line).

B-6 Dell Precision 210 Desktop Systems User’s Guide