MVME162‑042 (Motorola/Emerson)

Position: The "25MHz, no FPU, 8MB, single network port, with SCSI" low-cost version within the MVME162‑04x series; The CPU is LC040, unable to perform floating-point operations.

I. Basic Information

Model: MVME162‑042

Brand: Motorola / Emerson

Form: 6U VME64 single-board computer (SBC)

CPU: MC68LC040 @ 25 MHz (no FPU, with MMU, 8KB Cache)

Status: EOL， industrial spare parts circulation

Core Differences： No floating-point (LC040) + Single network port + With SCSI

II. Core Hardware Specifications (Compared with 040/041)

1) Processor (Key Differences)

MC68LC040, 25 MHz

❌ No FPU (no floating-point operation); ✅ Has MMU, 8KB unified cache

Performance: Approximately 15 MIPS, unable to run floating-point algorithms

2) Memory (Same as 040/041)

DRAM: 8 MB (parity), maximum 32 MB

SRAM: 512 KB, battery backup

Flash: 1 MB

NVRAM/RTC: 8 KB + real-time clock, battery backup

3) I/O Interfaces (Single network, with SCSI)

VMEbus: VME64 A32/D32, master / slave, DMA, system controller

Ethernet: 1×10 Mbps (single network port)

Serial Port: 2×RS-232 (Console + configurable)

SCSI: Narrow SCSI-2 (full functionality, retained)

IP Slot: 4×IndustryPack (IP) expansion slots

Parallel Port: 8-bit bidirectional

4) Electrical / Environmental (Same as 040/041)

Power Supply: +5 V @ 4 A (low power consumption)

Operating Temperature: 0 ℃ ~ +70 ℃

Size: 6U VME (233 × 160 mm)

III. MVME162-040/041/042 Overview (Quickly Differentiate)

Table

Model CPU Core Frequency FPU DRAM Network Port SCSI Positioning

040 68040 25MHz ✅ 8MB 2×10M ✅ Standard Model (Dual Networks + Floating Point)

041 68040 25MHz ✅ 8MB 1×10M ✅ Simplified Model (Single Network + Floating Point)

042 68LC040 25MHz ❌ 8MB 1×10M ✅ Economy Model (Single Network + No Floating Point)

Note: 042 = 041 with the CPU replaced by the LC040 without floating point, otherwise it is basically the same.

Four. Functional Features

No FPU, Low Power Consumption: LC040 has no floating point, lower power consumption and lower cost

Single Network Port + SCSI: Suitable for systems without redundancy, without floating point, but with SCSI storage

Full I/O Retention (except dual networks): VME, dual serial ports, IP slot are all complete

Complete Power Failure Protection: SRAM/NVRAM/RTC battery backup

Five. Typical Applications

Industrial Automation: No floating point operation, single network, with SCSI, DCS/PLC

General Control / Data Acquisition: Logical control, IO-intensive, without floating point algorithm

Budget-sensitive Projects: Replace 040/041, reduce cost without reducing basic IO capability

Six. Replacement and Purchase

Direct Replacement:

Need Floating Point: MVME162-041 (Single Network + FPU)

No Floating Point: MVME162-042 itself (The most economical)

Upgrade Replacement: MVME2700, MVME3100 (PowerPC, Gigabit Network, FPU standard)

Note: 042 is the cheapest model in 04x, with medium market inventory.