Sony PCG-XG29 - Manual (Page 79)

Connecting an External Mouse or Keyboard $%
Connecting an External Mouse or Keyboard
You can connect a USB or PS/2® style mouse or keyboard.
Plug the keyboard cable or mouse cable into this connector with the
facing up.
✍
USB devices can be connected and disconnected while the computer is on.
➠
USB Mouse
USB Keyboard
PS/2 Mouse
PS/2 Keyboard