The RadiSys/Texas Micro D486DX2/66 is a single board computer engineered for embedded control and industrial applications. Built around the Intel 486DX2 processor operating at 66 MHz with clock-doubled architecture from a 33 MHz bus, this SBC delivers near-zero wait state performance while maintaining low power consumption of approximately 9 W. The board supports up to 64 MB of Fast Page Mode DRAM and integrates an 8 KB L1 cache plus 128 KB write-back secondary cache for efficient instruction and data handling.
Technical Specifications
• Processor: Intel 486DX2 at 66 MHz (clock-doubled from 33 MHz bus); also supports Intel 486DX and Intel DX4 variants
• Cache: 8 KB L1 instruction/data cache; 128 KB secondary write-back cache
• Memory: Up to 64 MB Fast Page Mode DRAM using 70 ns SIMMs; optional up to 72 MB flash memory for program and parameter storage
• Bus Architecture: 32-bit internal and external buses with burst cycle support; Socket 2 interface; buffered drivers support up to 19 expansion cards
• Power Supply: 3.45 V operation with 5 V tolerant I/Os; typical consumption 9 W
• Operating Modes: Real, virtual-8086, and protected modes; System Management Mode (SMM) with hardware/software-initiated suspend
– Key Features
• Integrated Floating-Point Unit and 16-bit hardware multiplier
• Programmable bus speed, I/O speed, CPU and memory wait states via extended setup
• Support for 8-, 16-, and 32-bit data types
• Fully static core permits clock-stop state for power management
• IDE and floppy disk controllers integrated on board
– Interfaces
• 2 × RS-232 serial ports (16550 compatible)
• 1 × bidirectional Centronics-compatible parallel port
• PS/2 keyboard port
• IDE hard drive and floppy disk interfaces
• PC/104 expansion interface
• Super VGA output (model dependent)
• Ethernet port (model dependent)
– Typical Applications
Industrial control systems, embedded data acquisition, legacy process automation, and distributed embedded systems requiring proven 486-class processing with low power draw and extensive expansion capability.
