The RadiSys EXM-23 LCD Controller Expansion Module is a 16-bit universal VGA interface card for embedded systems requiring LCD display integration. Built around the Chips and Technologies 65535 controller, it delivers full IBM VGA standard compliance with support for monochrome, grayscale, and color LCD panels. The module provides all necessary data and control signals, paired with an adjustable power supply spanning -40V to +40V for LCD bias and backlight drive requirements. Video memory is configurable at build time—512 bytes using a single 256K × 16 fast page mode DRAM, or 1 MB using dual fast page mode DRAMs. Video BIOS is stored in either a 27C010 32-pin DIP EPROM or optional 27C256 28-pin DIP EPROM, supporting monochrome, passive and active color, and electroluminescent display modes. The EXM-23 interfaces via a female shielded mini-D-50 connector for panel connection and integrates directly into RadiSys EXM expansion carriers using an ISA-bus-equivalent interface.
Technical Specifications
• Controller Chip: Chips and Technologies 65535
• Interface: 16-bit Universal VGA Interface (electrically similar to ISA bus)
• Video Memory: 512 bytes standard (256K × 16 DRAM) or 1 MB optional (dual fast page mode DRAMs)
• Video BIOS: 27C010 32-pin DIP EPROM or 27C256 28-pin DIP EPROM (build-time selectable)
• Memory Address Range: 0A0000h–0BFFFFh (EXM Interface memory space)
• Power Supply: -40V to +40V adjustable
• Operating Temperature Derating: 2°C per 1,000 ft. elevation
• Maximum Elevation: 10,000 ft.
– Key Features
• Full IBM VGA standard compatibility
• LCD panel support: monochrome, grayscale, color, and electroluminescent modes
• Integrated data and control signaling for LCD integration
• Configurable video memory architecture
• Female shielded mini-D-50 panel connector
– Compatibility & Integration
The EXM-23 operates within RadiSys EXM expansion carriers supporting up to 8 expansion modules per system. Standard PC software executes directly on ISA-equivalent bus architecture. The module is incompatible with EPC-2E, EPC-3 (built-in VGA controllers cannot be disabled), and EPC-6 (slot size constraints).
