Extended Systems ESI-PRB705A Port Replicator IBM ThinkPad 755 760 Series

Extended Systems ESI-PRB705A Port Replicator IBM ThinkPad 755 760 Series

The Extended Systems ESI-PRB705A is a port replicator designed for IBM ThinkPad 755 and 760 Series laptops. It connects to the ThinkPad's proprietary docking connector and expands the laptop's connectivity with a full complement of desktop-standard ports, eliminating the need to plug and unplug individual cables each time the laptop is used at a desk. Manufactured by EASi for Extended Systems and UL-listed (File E172518).

Specifications & What's Included

• Model: Extended Systems ESI-PRB705A
• Compatible with: IBM ThinkPad 755 Series and ThinkPad 760 Series
• PS/2 Keyboard Port
• PS/2 Mouse Port
• Parallel Port (DB-25)
• Video Port (VGA/DB-15)
• Serial Port (DB-9)
• Docking connector: proprietary IBM ThinkPad edge connector (visible in photos)
• Max Rating: 20V, 2.50 mAh
• UL Listed — File E172518, Listing 83ZJ
• Manufactured by EASi for Extended Systems
• Includes: original manufacturer box, sleeve, and some paperwork

Applications

Port replicators like the ESI-PRB705A were designed for business laptop users who needed a quick way to connect their portable computer to a full desktop peripheral setup — keyboard, mouse, monitor, and printer — without reconnecting each cable individually. The IBM ThinkPad 755 and 760 Series were mid-1990s business-class laptops widely used in corporate environments; accessories like this replicator were standard desk-setup equipment for road warriors returning to the office. Unlike a full docking station, a port replicator provides expanded I/O without adding drives or bays, making it a compact and affordable solution. Today these units are sought by collectors and users maintaining legacy ThinkPad systems, as well as anyone running DOS or early Windows software that requires physical parallel or serial port connections no longer found on modern hardware.