Dell Precision 530 Guide De Configuration Et De Référence Rapide page 11

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Keyboard and Mouse
Connect the keyboard and mouse as shown in the following illustration.
NOTE: If you have a Personal System/2 (PS/2) keyboard, connect it into the
PS/2 keyboard connector. If you have a Universal Serial Bus (USB) keyboard,
connect it to a USB connector as shown in the illustration. Do not connect a
USB mouse or keyboard to the USB connectors on the front of the computer.
NOTE: Do not attempt to operate a PS/2 mouse and a USB mouse
simultaneously.
PS/2 or USB
keyboard
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PS/2 or USB
mouse
Setup and Quick Reference Guide
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