Sharp PC-MR70 Manual page 49

Keyboard/Mouse
You can use a full size desktop keyboard or external mouse with your computer.
Never connect or disconnect the devices to the keyboard/mouse port
when the computer is powered on (except for USB keyboard/mouse).
This may cause the computer to operate improperly.
Using a PS/2 Mouse/Keyboard
You can connect a PS/2 mouse/keyboard to the mouse/keyboard port of the rear side
of your computer.
Using a USB Mouse/Keyboard
You can connect a USB mouse/keyboard to the USB port of the rear side of your
computer.
Before removing USB mouse/keyboard, you may need to perform some
steps. See USB Device of this chapter.
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