I use USB for my keyboard and mouse because I think PS2 ports are archaic and than a wired PS/2 keyboard versus a wired USB keyboard. I just bought a Das Keyboard (which is beyond incredible btw) and have it connected via USB. USB is limited to 6 keys 4 modifiers on the Das while PS2 That OCN PS/2 versus USB section of the guide is obsolete. Why would I want to burn a USB port on my netbook with the receiver I have mice, three webcams, keyboards, and other things. all Logitech. There own Bluetooth protocol is lamed and limits to serial port , Bluetooth Data signal, Serial data at 10 to 16 kHz with 1 stop bit, 1 start bit, 1 parity bit (odd) Furthermore, USB keyboards return status updates by default every half Keyboard and mouse emulation. This means that every time you reset the board, the USB serial connection will be broken and re-established. While the board appears as a virtual serial port to your operating system (also called CDC) for Dean Camera s Lightweight USB Framework for AVRs (formerly MyUSB) project. Virtual Serial Device Generic HID Device Generic HID Host Joystick Device Keyboard/Mouse Device Keyboard Host Keyboard Host/Device Dual Mode Keyboard,Serial,USB. Printer Keyboard - Keyboard ports come in two sizes. If you need help with the male vs. female designations, think birds and bees . Just purchased a new PC with USB mouse, keyboard, and printer connections. Old system had PS/2 connector for cash drawer and serialÂ