Toshiba T2200SX User Manual page 6

Batteries There are three different batteries: a main battery, for system power; a sub-
battery, for back-up power, and an RTC battery, which keeps the date and
time and system configuration even when power is off.
Mouse Port A PS/2 mouse connector is located on the right side of the computer.
Interface Ports A parallel port, serial port, RGB port, numeric keypad port, and expansion
bus connector are provided to allow the T2200SX to interface with a variety
of optional equipment.
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