Emerson / Motorola MVME147-012 25MHz, 8MB Single Board Computer

The Emerson/Motorola MVME147-012 is a 6U VMEbus single-board computer built around the Motorola MC68030 microprocessor running at 25 MHz. This integrated platform combines processor, memory, I/O, and network connectivity in a compact single-height form factor, eliminating the need for external backplane modules in embedded and industrial control deployments.

## Technical Specifications

**Processor & Co-Processing**
• Motorola MC68030 enhanced 32-bit microprocessor, 25 MHz clock with on-chip instruction/data cache and Memory Management Unit (MMU)
• Motorola MC68882 Floating-Point Co-processor, 25 MHz synchronous operation

**Memory Configuration**
• 8 MB DRAM with programmable parity
• 4 KB × 8 SRAM with battery backup for time-of-day clock
• Four 28/32-pin ROM/PROM/EPROM/EEPROM sockets (16-bit wide)
• M48T18 NVRAM/Clock chip with battery backup

**VMEbus Interface**
• A32/D32 master/slave VMEbus controller with VME64 compliance (ANSI/VITA 1-1994, IEEE STD 1014)
• VMEchip ASIC; P1 connector; 4-level requester, 7-level interrupter, 7-level interrupt handler

**I/O & Communications**
• Four EIA-232-D serial ports (8530 controller, default 9600 baud, configurable)
• Centronics-compatible parallel printer port (8-bit bidirectional via PCC ASIC)
• 10 Mb Ethernet: AMD AM7990 Lance MAC and Intel LXT901 SIA with factory-assigned station address
• SCSI bus interface with DMA using WD33C93B narrow SE controller

**Timers & Diagnostics**
• Two 16-bit timers, watchdog timer
• 147Bug on-board debugger and diagnostics; four status LEDs (FAIL, STAT, RUN, SCON); RESET and ABORT switches

**Physical**
• Single-height 6U VME board: 233.4 mm height, 160.0 mm depth, 19.8 mm width
• 94V-0 flammability rating (UL); FCC Part 15 Class A compliant

## Key Features

• Integrated system controller reduces external module dependencies
• 25 MHz synchronous processor and FPU pairing for sustained floating-point performance
• DMA-capable SCSI interface for disk-based mass storage
• Battery-backed time-of-day clock for unattended operation
• Four independent serial channels for multi-device control

## Typical Applications

• Industrial process control and automation
• Embedded real-time systems requiring floating-point computation
• Data acquisition and networked monitoring stations
• Legacy VME systems requiring high integration density

## Compatibility & Integration

Full A32/D32 VMEbus master and slave capability; compatible with standard VME64 backplanes. Ethernet, SCSI, and serial interfaces support integration with industry-standard peripherals and network infrastructure.