The RadiSys EXM-HD2 Hard Drive Expansion Module is an IDE-based storage expansion unit designed for RadiSys embedded PCs. It connects via the EXM expansion interface—an electrically ISA-compatible standard developed by RadiSys in 1989—and provides additional storage capacity without requiring extensive system modifications. The module occupies a single EXM slot and ships unpartitioned and unformatted, requiring operating system-specific setup before use.
Technical Specifications
• Interface: IDE (Integrated Drive Electronics)
• Expansion Standard: EXM expansion interface with electrical compatibility to PC ISA bus
• Module ID: 7Dh (EXM-HD series identifier)
• Slot Occupancy: Single EXM slot
• I/O Address – IDE Registers: 3F7h
• I/O Address – Configuration Register: 102h (read/write)
• Form Factor: EXM expansion module
• Drive Type: IDE hard disk (capacity on request)
– Key Features
• PC-compatible IDE hard disk functionality enables software interoperability across all PC operating systems
• Single-slot form factor simplifies integration into VME, VXI, and EMC-based systems
• Standard I/O addressing at 3F7h and 102h allows straightforward driver implementation
• Self-contained design minimizes chassis modifications
• Power supplied via EXM expansion interface from host system
– Typical Applications
• Augmenting storage capacity in embedded PC systems with limited onboard resources
• Data logging and archival in industrial control platforms
• Expanding mass storage for test and measurement systems
– Compatibility & Integration
The EXM-HD2 is compatible with all PC operating systems due to its standard IDE architecture. However, note the following constraints: the module cannot operate in the same system with an EXM-9 disk controller unless one remains disabled. consult RadiSys documentation regarding potential incompatibilities between specific EXM modules and carrier platforms, as certain configurations may present bus-level conflicts.
