I. Product Positioning

MVME167‑033B is a 6U VME single-height SBC from Motorola/Emerson. It is the B revision (enhanced version) of MVME167‑033A.

Core: 33MHz MC68040 + 16MB parity DRAM + enhanced anti-interference / ESD / firmware.

It is fully compatible and directly interchangeable with pins / mechanics / interfaces of 031A/032A/033A/034A/031B/032B/034B.

Positioning: 33MHz, 16MB large memory, high-reliability VME control for harsh industrial environments.

II. Core Hardware Parameters (Same as 033A, B versions with enhanced processing technology)

1) Processor

MC68040RC33, 33 MHz

32-bit, built-in FPU (hardware floating point), 8KB L1 cache, MMU

33 MHz is approximately 30% more powerful than the 25 MHz model, with stronger floating point capabilities

2) Memory (Key for 033 series: 16MB)

DRAM: 16MB 32-bit parity (standard), expandable to 32MB

SRAM: 128KB battery backup (data retention during power loss)

Flash/ROM: 4×44-pin PLCC, 2×32-bit storage units

NVRAM/RTC: 8K×8 NVRAM + real-time clock (battery backup)

3) Board I/O (Consistent with the series)

Ethernet: 10Mbps 10BASE-T/AUI, DMA

Serial ports: 4×EIA-232-D (1 control + 3 user), up to 115200bps

SCSI-2: single-ended, DMA, 20MB/s, supports 7 external devices

Parallel port: 1×IEEE 1284 bidirectional

VME bus: A32/D32, master / slave / system controller

Expansion: PMC expansion slot (optional)

Timers / Watchdog: 6×32-bit programmable timers + hardware WDT

4) Electrical and Environmental (B version more stringent)

Power supply: +5V DC ±5%, typical 4.0A, maximum 5.0A

Operating temperature: 0℃～+55℃ (standard)

Storage temperature: -55℃～+125℃

Cooling: forced air cooling, approximately 100CFM

Power consumption: approximately 20W (typical)

5) Structure

Size: 6U VME (233.4×160mm), single height

Weight: approximately 0.7kg

III. Key Differences between 033A and 033B (B version = industrial enhanced version)

PCB and layout: B version optimizes routing and impedance control, reducing EMI/RFI

ESD / Anti-interference: B version enhances electrostatic protection, surge suppression, more stable in harsh conditions

Firmware (167Bug): B version updates firmware, fixes known bugs, improves stability

Reliability screening: B version undergoes more rigorous high-temperature / aging tests at factory, longer MTBF

Application scenarios: 033A for general industrial use; 033B for strong interference / long-term unmanned值守 / high reliability requirements

IV. Memory Selection for MVME167 33MHz (A/B versions are the same)

031A/B： 4MB (entry-level)

032A/B： 8MB (mainstream)

033A/B： 16MB (mid-to-high configuration)

034A/B： 32MB (top configuration for 33MHz real-time computing + 16MB large memory VME system)

V. Typical Applications

Industrial automation， machine vision， motion control， data acquisition， strong interference / high reliability / systems requiring 33MHz real-time computing + 16MB large memory VME.