Keysight / Agilent / HP 27209 HP-IB, GPIB ISA Interface Card

The Keysight/Agilent/HP 27209 is an ISA bus interface card that enables computer control and communication with GPIB instruments. This memory-mapped I/O card implements the HP-IB (Hewlett-Packard Interface Bus) standard, later formalized as IEEE-488, providing a bridge between legacy test equipment and computer systems. Originally introduced in the mid-1980s, the 27209 served as the foundation for GPIB connectivity before successor models like the HP 82335 emerged.

Technical Specifications

Bus Interface: ISA (Industry Standard Architecture) expansion slot

GPIB Standard: HP-IB / IEEE-488 compliant

Maximum Bus Devices: Up to 15 instruments per single GPIB bus

Maximum Bus Length: 20 meters total

Memory Architecture: Memory-mapped I/O

Key Features

Direct ISA slot installation for host computer integration

Multi-device instrument control on single GPIB channel

IEEE-488 standardized protocol implementation

Legacy platform support for DOS and Windows 3.x environments

Typical Applications

Automated test equipment (ATE) systems using vintage GPIB instruments

Laboratory measurement and control in DOS/early Windows environments

Instrument interconnection for distributed measurement networks

Educational and research facilities operating legacy test benches

Compatibility & Integration The 27209 interfaces with any GPIB/IEEE-488 compliant instrument. Direct compatibility exists with DOS and Windows 3.x operating systems. The HP 82335 card provides functional compatibility as a successor platform with minor enhancements. ISA bus architecture limits deployment to systems with available ISA expansion slots - increasingly rare in modern computing platforms. As a legacy product, the 27209 is end-of-life from the manufacturer; third-party suppliers may provide availability and support for existing installations.