The RadiSys EPC-8 is a 32-bit VMEbus-resident embedded computer built around the Intel486 microprocessor, delivering PC/AT compatibility with full system controller functionality. It combines processor, memory, Super VGA graphics, and Ethernet on a single board, engineered for deployment in industrial and enterprise environments where reliability and expandability are non-negotiable.
Technical Specifications
Processor
• Intel486 microprocessor with on-chip math coprocessor and four-way set associative cache
• Processor options: 486SX (25 MHz), 486DX (33 MHz), or 486DX2 (50 MHz)
• 64-bit local bus providing zero-wait-state DRAM access
Memory Configuration
• Onboard DRAM: 4MB, 8MB, or 16MB (not VMEbus-accessible)
• Optional 128KB memory-mapped SRAM
• Optional 2MB flash memory with direct boot capability
• Optional 128KB battery-backed SRAM (when configured with 2MB flash)
• Hardware memory mapping: 640KB conventional memory plus 3MB to 15MB extended memory depending on DRAM configuration
VMEbus Interface
• Full 32-bit master interface with A32/A24/A16:D32/D16/D08 addressing
• All seven VMEbus interrupt generation and receipt
• Full slot-1 system controller functionality with four-level priority arbitration
• Round-robin or priority-based bus arbitration
• IACK daisy-chain driving and SYSCLK generation
• Bus address time-out detection and memory-locking support for read-modify-write operations
• VMEbus address windowing hardware enabling A32, A24, and A16 access within DOS/Windows and OS/2 environments via 64KB logical pages
• VXIbus subset support
Expansion
• 16-bit PC/AT-compatible EXM expansion bus for local embedded expansion independent of VMEbus activity
• Two-slot modular expandability for peripheral integration
– Key Features
• Integrated Super VGA and Ethernet on-board
• Standalone or networked deployment options
• Flash boot capability eliminates hard disk drive requirement
• Battery-backed SRAM option for non-volatile data retention
• Full VMEbus master and system controller operation
• Hardware-managed VMEbus address translation across all three address spaces
– Typical Applications
Industrial control systems, embedded data acquisition, VMEbus-based instrumentation, and enterprise computing platforms requiring deterministic, real-time operation in harsh environments.
– Compatibility & Integration
PC/AT software compatibility with DOS, Windows, and OS/2 environments. VMEbus Extensions for Instrumentation (VXIbus) capable. EXM expansion modules extend functionality without saturating the VMEbus.
