Emerson / Motorola MVME147-023 33MHz, 16MB Single Board Computer

The Emerson/Motorola MVME147-023 is a 6U VMEbus single-board computer built around the Motorola MC68030 enhanced 32-bit microprocessor running at 33 MHz. The board integrates 16 MB of parity-protected DRAM, an MC68882 floating-point coprocessor operating at 33.33 MHz, and comprehensive on-board I/O including four serial ports, 10 Mb Ethernet, narrow SE SCSI mass storage interface, and one 8-bit parallel port. The MC68030's on-chip instruction and data cache delivers 20–40% efficiency gains, while the integrated Memory Management Unit (MMU) enables virtual memory and software protection. The VMEchip ASIC provides full VME64 (IEEE STD 1014) compliance via the P1 connector. A 4K × 8 SRAM with battery-backed time-of-day clock and MK48T02 non-volatile RAM support persistent timekeeping. Four ROM/PROM/EPROM/EEPROM sockets accommodate firmware and boot code. The Programmable Channel Controller (PCC) and General Control Chip (GCC) ASICs manage peripheral integration and reduce VMEbus slot occupation. On-board debugger and diagnostic firmware simplify development and system verification. This architecture is ideal for industrial control, data acquisition, and embedded applications demanding integrated I/O without external transition modules.

Technical Specifications

Processor: Motorola MC68030, 33 MHz; on-chip instruction and data cache (20–40% efficiency improvement); complete Memory Management Unit (MMU)

Coprocessor: Motorola MC68882 floating-point coprocessor, 33.33 MHz

Memory: 16 MB DRAM with parity; 4K × 8 SRAM; MK48T02 non-volatile RAM and clock with battery backup; four 28/32-pin ROM/PROM/EPROM/EEPROM sockets

VMEbus Interface: VME64 (ANSI/VITA 1-1994, IEEE STD 1014); VME6000 controller; VMEchip ASIC; 6U single-height form factor; P1 connector

Serial Communications: Four EIA-232-D ports (85C30 controller)

Ethernet: 10 Mb MAC controller (AMD AM7990 Lance); Intel LXT901 Ethernet Serial Interface Adapter

SCSI: WD33C93 narrow SE controller; high-level command packet interface firmware

Parallel Port: One 8-bit bidirectional interface (Programmable Channel Controller)

Key Features

On-chip cache eliminates frequent memory fetches for instruction and data streams

MMU supports virtual memory and protected software execution

Four serial ports cover synchronous and asynchronous communication requirements

Integrated Ethernet and SCSI reduce external module dependency

Battery-backed clock maintains real-time data across power cycles

On-board firmware debugger and diagnostics accelerate development

Typical Applications Industrial process control, embedded data logging, real-time instrumentation, and VMEbus-based test systems requiring integrated networking and mass storage without additional backplane modules.

Compatibility & Integration Full VME64 compliance ensures interoperability with standard VMEbus backplanes. Optional MVME712M transition module provides DB-15 Ethernet, SCSI, and Centronics connectors for external connectivity.