Serial Port

Most older ThinkPads have a Male DB-9 RS232 Serial Port, capable of running up to 115,200bps

Current ThinkPads no longer have a physical serial port, but still have the logic integrated, all that is required is to attach the ThinkPad to a supported Dock or Port Replicator with a serial port.

ThinkPads produced from 1994 onwards have a NS16550A compatible uart.

• Wikipedia article on Serial Port
• Wikipedia article on UART

Models featuring this Technology

Legacy UART

• ThinkPad 220
• ThinkPad 550BJ

16550A compatible UART

• ThinkPad A20m, A20p, A21e, A21m, A21p, A22e, A22m, A22p, A30, A30p, A31, A31p, A275, A285, A475, A485
• ThinkPad T20, T21, T22, T23, T30