Notes:

• In order to attach a PS/2 interface external keyboard DIRECTLY to a ThinkPad system PS/2 port, the Keyboard/mouse connector (Option p/n 54G0441) is required.
• In order to attach an USB interface external keyboard to a ThinkPad system, a USB port and an operating system with USB support is required.
• Withdrawn means the product is no longer being manufactured.
• Click the links above for additional information and geography part numbers.
• The following is an example image of a ThinkPad system PS/2 port
  
• The following ThinkPad systems do not have a PS/2 port and do not support PS/2 interface only devices connected directly to the system:
  Note: A PS/2 port may be available with a docking station, port replicator, or UltraBase where available.
  • A30/p, A31/p
  • R30, R31, R32
  • R40, R40e
  • R50, R50p, R51, R52
  • T30, T40, T40p, T41, T41p, T42, T42p, T43, T43p
  • X20, X21, X22, X23, X24, X30, X31, X32, X40, X41, X41 Tablet
  • Z60m, Z60t
  • TransNote
• The following is an example image of a ThinkPad system USB port
  
• Click the following links for instructions on how to remove and install the internal keyboard on your ThinkPad system:
  Removing and installing ThinkPad A20(all), A21m, A21p, A22m, A22p systems internal keyboard
  Removing and installing ThinkPad A21e, A22e systems internal keyboard
  Removing and installing ThinkPad A30, A30p, A31, A31p systems internal keyboard
  Removing and installing ThinkPad G40 systems internal keyboard
  Removing and installing ThinkPad R3* systems internal keyboard
  Removing and installing ThinkPad R40, R40e systems internal keyboard
  Removing and installing ThinkPad R50, R50p systems internal keyboard
  Removing and installing ThinkPad T2* systems internal keyboard
  Removing and installing ThinkPad T23 systems internal keyboard
  Removing and installing ThinkPad T30 systems internal keyboard
  Removing and installing ThinkPad T40, T40p, T41, T41p, T42, T42p, T43, T43p systems internal keyboard
  Removing and installing ThinkPad X2* systems internal keyboard
  Removing and installing ThinkPad X30 systems internal keyboard