Emerson / Motorola MVME374-1 Ethernet Controller Board

The Emerson/Motorola MVME374-1 is a VMEbus-compatible Ethernet controller board engineered for industrial networking integration. This single-board computer combines processing power, memory, and intelligent Ethernet connectivity to enable reliable data communication within VMEbus-based systems operating in demanding environments.

## Technical Specifications

**Processor & Coprocessor**
• MC68020 @ 16 MHz or MC68030 @ 16 MHz / 25 MHz
• MC68881 floating-point coprocessor (16 MHz) or MC68882 (25 MHz)

**Memory & Storage**
• RAM: 1 MB or 4 MB options
• Shared onboard memory: 4 MB or 8 MB
• Hard disk: 80 MB
• Onboard battery-backed time-of-day clock

**Ethernet Interface**
• 15-pin connector configuration
• Intelligent Ethernet controller with 25 MHz interface capability
• DMA-enabled SCSI interface

**Serial & Parallel I/O**
• Four asynchronous serial ports standard
• RS-232C connectivity: up to sixteen serial connectors (configuration-dependent)
• Parallel printer port
• Optional remote maintenance modem jack

**Power & Environmental**
• Supply voltage: 5 V ±5%
• Designed for harsh industrial conditions
• Certifications: CE, FCC, UL

**Operating System**
• System V/68 Release 3 (AT&T SVID compliant)

## Key Features

• Full VMEbus compatibility enables integration with diverse peripheral ecosystems
• Modular connector architecture supports MVME335 and MVME712B expansion modules
• Four BIOS chips installed (standard configuration)
• Front-panel controls: reset button, abort button, power switch, status LEDs
• Half-height cartridge tape drive available in select configurations
• Weight: 3 lbs (shipping)

## Typical Applications

Industrial control systems, real-time data acquisition, networked embedded processing, and VMEbus-based infrastructure requiring integrated Ethernet communication.

## Compatibility & Integration

The MVME374-1 integrates into existing VMEbus architectures. Optional MVME712B module connectors provide external SCSI and Ethernet expansion. RS-232C serial connector flexibility supports both legacy and modern peripheral devices.