HP Compaq Presario,Presario 2100 Reference Manual page 12

13 AC adapter jack.
14 Universal serial bus ports (USB).
15 RJ-45 jack. Connects a network cable.
16 S-video out jack.
17 Parallel port (LPT1). Use this port for a parallel
printer or other parallel device.
18 Serial port (COM1). Use this port for a serial
mouse, modem, printer, or other serial device.
19 External monitor port.
Getting Started with Your Notebook
Identifying Parts of the Notebook
20 Kensington lock slot (security connector).
21 RJ-11 jack. Connects the modem cable.
22 PC Card and CardBus slot and button.
23 IEEE 1394 port (select models only).
24 Audio jacks (left to right): external microphone,
audio out (headphones).
25 Volume control.
26 Audio mute button and audio mute light.
27 Floppy disk drive (select models only).
Reference Guide 3