Operating System : 4690 OS V5R2, Windows 2000/SPx, Windows XP/SP2, WEPOS, SUSE Linux, PC DOS Processors : Intel Celeron 440 2.0 GHz Memory Support : 667 MHz DDR2 DIMM 512 MB standard 4 GB maximum 2 slots Hard Drive : Zero, one, or two 80 GB or larger SATA II 7200 RPM VIA RAID 0, 1 Removable Storage : Internal CD-RW/DVD or DVD-RW Expansion Slots : 1xPCI, 1xlane PCI Express (PCI-E) I/O Ports : 3 x USB, 4 x RS-232, Parallel, 2 x PS/2, VGA, Audio I/O Communications : 10/100/1000 Mbps Dimensions : 320 x 475 x 117 mm (12.6 x 18.7 x 4.6 in) Weight : 11.4 kg (25.13 lbs)