Compaq 320, 321, 420, 421, 620 and 621 Notebook PC and HP 420 and 620 Notebook PC

Front components
Component Description
(1) SD Card Reader Supports the following optional digital card formats:
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MultiMediaCard (MMC)
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MultiMediaCard 4.2 (MMC Plus, including MMC Plus HC)
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Secure Digital (SD) Memory Card
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Secure Digital High Capacity (SDHC) Memory Card
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Secure Digital High Speed (SDHS) Memory Card
(2) Audio-out (headphone) jack Produces sound when connected to optional powered stereo
speakers, headphones, ear buds, a headset, or television audio.
NOTE: When a device is connected to the headphone jack, the
computer speakers are disabled.
(3) Audio-in (microphone) jack Connects an optional computer headset microphone, stereo array
microphone, or monaural microphone.
Right-side components
Component Description
(1) USB ports (2) Connect optional USB devices.
(2) RJ-11 (modem) jack (select models only) Connects a modem cable.
(3) Optical drive (select models only) Reads optical discs and, on select models, also writes to optical
discs.
16 Chapter 2 External component identification