for Notebook with Mini PCI slot

PCI one chip solution(OXFORD OXuPCI952 chip)

It's real COM Port in your computer, not USB to COM port
  high compatible with serial type device.

Mini PCI 4 Serial  in  Windows XP Device Manager

FEATURES

* Provides two DB9 RS232 ports
* High speed 16C950 compatible UART controller on-board
* Supports serial transmission rate up to 460Kbps
* On-chip hardware auto flow control to guarantee no data loss
* Built-in 128K byte DMA software FIFO
* No IRQ resource required
* Easy Plug and Play Installation
* Works with various types of RS232 serial devices including modems,
  PDAs, label printers, bar code scanners, digital cameras, and more
* Supports  Windows® 2000, XP, Server 2003 ,Vista ,Win7 and Linux
System Requirements:

* Windows® 2000, XP, Server 2003 ,Vista,Win7 and Linux

Accessories:

1 x Manual, 1 x Driver CD, 2 x 9pin serial cable