The Motorola MVME147A is a classic, high-performance VMEbus Single Board Computer (SBC) based on the MC68030 microprocessor. It was designed as a highly integrated solution for industrial automation, real-time data acquisition, and laboratory environments. The “A” version typically signifies an optimized hardware revision with enhanced memory management and refined I/O capabilities compared to the base MVME147 series.
For availability, lead times, or technical replacement support for legacy Motorola VME boards, please visit our MVME147A contact page.
Technical Description and Parameters
The MVME147A integrates a full 32-bit processor architecture with a comprehensive suite of I/O interfaces, making it a “computer-on-a-board” solution for VME systems.
- Microprocessor: Motorola MC68030 (typically clocked at 16, 25, or 33 MHz)
- Floating Point Coprocessor: MC68882 for hardware-accelerated math operations.
- Memory (DRAM): 4MB, 8MB, 16MB, or 32MB of onboard shared DRAM (model dependent).
- VME Interface: Full 32-bit (A32/D32) VMEbus interface with system controller functions.
- SCSI Interface: Integrated SCSI bus controller (8-bit) for connecting storage devices.
- Ethernet: Onboard 10Base2 or 10Base5 Ethernet interface (via the LANCE controller).
- Serial I/O: 4 RS-232 serial ports (via the CD1400 controller).
- Timers: Onboard real-time clock (RTC) and four 16-bit programmable timers.
Product Datasheet Specifications
- Board Format: Double-high (6U) VMEbus form factor.
- Weight: Approximately 0.85 kg (1.87 lbs).
- Power Requirements: +5V DC (typical 3.0A – 5.0A depending on RAM and clock speed).
- Operating Temperature: 0°C to +55°C (Standard industrial grade).
- Connectors:
- P1/P2: Standard VMEbus backplane connectors.
- Front Panel: Serial ports, Ethernet, and SCSI-2 (via transition modules).
- MTBF: In excess of 100,000 hours in controlled environments.
Application Fields
The MVME147A remains a vital component in long-lifecycle legacy systems:
- Defense & Aerospace: Used in flight simulators, telemetry stations, and ground support equipment.
- Semiconductor Manufacturing: Controlling wafer fabrication tools and automated testing equipment.
- Power Plant Control: Acting as a localized processing node for legacy DCS systems in older hydroelectric or thermal plants.
- Scientific Research: Data acquisition and instrument control in particle accelerators and laboratory setups.
Product Instructions for Use
- Configuration Jumpers: Before installation, verify the jumper settings for the VMEbus system controller (Global/Local) and memory address mapping. Incorrect jumpering can lead to bus contention errors.
- Chassis Installation: Slide the board into a standard 6U VME chassis. Ensure the P1 and P2 connectors are perfectly aligned. Tighten the front panel screws to ensure proper grounding and mechanical stability.
- SCSI Termination: If using the SCSI interface for external drives, ensure that the SCSI bus is properly terminated at both physical ends of the cable to prevent signal reflections.
- Operating Systems: The MVME147A is widely compatible with real-time operating systems (RTOS) such as VxWorks, VRTX, and OS-9, as well as Motorola’s own SYSTEM V/68.
Q&A: Frequently Asked Questions
Q: Can I upgrade the RAM on an existing MVME147A board? A: No. The DRAM on the MVME147A is typically surface-mounted or factory-soldered. Memory capacity is determined by the specific part number (e.g., MVME147A-1 vs. MVME147A-2).
Q: Why is my board reporting a “BBERR” (Bus Error)? A: This is often caused by an attempt to access a memory address that does not exist or by a conflict with another VME board. Check your address jumpers and ensure the VME backplane is correctly terminated.
Q: Is the MVME147A compatible with modern 64-bit VME controllers? A: While it uses a 32-bit architecture, it can coexist in a VMEbus chassis with newer controllers, provided the bus arbitration logic is correctly configured and the software does not expect 64-bit data transfers from this specific board.
Related Product News
As of 2026, the MVME147A is firmly in the “End of Life” (EOL) category for the original manufacturer, but it remains a high-demand item in the secondary and refurbishment markets. Many defense and industrial sectors have opted for “Sustainment Programs” rather than full system overhauls to save on software recertification costs.
Technical advancements in 2026 have introduced “VME-to-PCIe” bridges that allow data from legacy boards like the MVME147A to be mirrored into modern cloud-based diagnostic environments. This allows facilities to monitor the health of their legacy MC68030-based processors in real-time, helping to predict component aging (such as capacitor dry-out) and preventing unscheduled downtime in critical infrastructure.
