Emerson / Motorola / Force Computers CPU-33B/4 SYS68K Single Board Computer

The Emerson/Motorola/Force Computers CPU-33B/4 SYS68K is a single-board computer built around the Motorola MC68030 microprocessor for embedded systems and industrial control applications. Operating at 25 MHz, this VMEbus-resident module delivers computing in demanding environments through a flexible synchronous bus architecture and integrated floating-point coprocessor support. The board combines a Memory Management Unit with dual 256-byte instruction and data caches, supporting a 4 Gbyte addressing range. On-board static RAM enables zero wait-state memory operations. An integrated FORCE Gate Array (FGA-002) manages I/O and control functions. Automatic power-on and watchdog timer circuits ensure reliable system initialization and fault detection. The CPU-33B/4 maintains object code compatibility with the 68020 integer unit, enabling straightforward migration of legacy software.

Technical Specifications

Processor: Motorola MC68030 at 25 MHz

Floating-Point Coprocessor: 68882

Memory Management: Dual independent MMUs for instruction and data

On-Chip Cache: 256 bytes instruction + 256 bytes data

Addressing Range: 4 Gbyte

On-Board Memory: Static RAM with zero wait-state operation

Bus Standard: VMEbus (IEEE 1014)

Gate Array: FORCE FGA-002

Power Control: Voltage sensor and watchdog timer

Key Features

High-bandwidth synchronous bus for efficient data transfer

68020 upward user object code compatibility

Dual caches reduce memory access latency

Zero wait-state static RAM minimizes processor stalls

Integrated watchdog timer and power monitoring for system reliability

Typical Applications Industrial automation and control systems, real-time embedded applications, process monitoring, data acquisition and logging in field environments.

Compatibility & Integration Designed for VMEbus systems with standard IEEE 1014 compliance. Supports integration with external VME-compatible modules and peripherals for system expansion. Compatible with 68561 Multi-Protocol Communications Controllers and 68230 Parallel Interface and Timer modules for extended I/O functionality.