Monoprice 103406 4-Port USB PS2 Combo KVM Switch with Cables - Retail (103406)
Controls 4 computers from a single console (Keyboard/Mouse) over PS/2 and/or USB connections. Emulates a keyboard on each PC to allow your computers to boot normally without a keyboard error. Supports Windows Linux Mac OS9/OSX Sun Micro Solaris 8 (For Sun Micro users the external power adaptor is necessary when using the KVM Switch)