Dell Dimension 2100 System Reference Manual page 43

PS/2-style keyboard
PS/2-compatible mouse
USB
Internally accessible
Primary IDE
Secondary IDE
Floppy drive
Video
Video controller
Power
DC power supply
Wattage
Heat dissipation
Voltage (switch selectable on
back panel)
Backup battery
Physical
6-pin mini-DIN connector
6-pin mini-DIN connector
two USB-compliant connectors
40-pin connector on PCI bus
40-pin connector on PCI bus
34-pin connector
Intel 810e chip set with Dynamic Video Memory and 4-MB,
133-MHz display cache or Intel 810 chip set with Dynamic
Video Memory
145 W
700 BTU (fully loaded system without monitor)
90 to 135 V at 60 Hz;
180 to 265 V at 50 Hz;
100 V at 50 to 60 Hz for Japanese systems
3-V CR2032 coin cell