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The StarTech.com 2-Port Serial CardBus Adapter for Laptop Computers (Model CB2S650) is a versatile expansion card designed to add two serial ports to laptop computers. With the StarTech brand known for quality and reliability, this adapter allows users to easily expand their laptop's capabilities for a variety of serial communication needs. The compact size of the adapter makes it ideal for use with laptop computers, providing a convenient solution for expanding port options.

StarTech.com 2-Port Serial CardBus Adapter for Laptop Computers (Model CB2S650), originally released in the mid-2000s.This card functions as a mobile equivalent to the Syba PCI serial card you showed earlier.

It was specifically built so field technicians, engineers, and mobile professionals could add rugged, native serial connectivity to their laptop computers using an expansion slot instead of a standard USB port.

Key Technical SpecificationsBrand: StarTech.com (famous for making highly specialized, "hard-to-find" niche computer connectivity parts)Model Number: CB2S650Form Factor: 32-bit PCMCIA CardBus. It slides directly into the wide legacy expansion slot on the side of 1990s and 2000s-era laptops.Interface Ports: It includes a custom breakout dongle cable that splits a proprietary connector into 2x 9-pin RS-232 Serial (DB-9) Male Ports.