I. Core Parameters (Easy to Understand)

CPU: MC68040, 32 MHz, 32-bit, with FPU/MMU/8KB Cache

DRAM: 8MB FPM (parity check)

SRAM: 512KB battery backup (powerful in case of power loss)

Flash: 1MB

Bus: VMEbus A32/D64, master/slave, system controller

Built-in I/O (Critical)

✅ 10 Mbps Ethernet (board-mounted, with DMA)

✅ SCSI interface (board-mounted, with DMA)

2 × Serial ports: Console (EIA-232-D), EIA-232/422 optional

4 × IndustryPack (IP) expansion slots

Environment: Industrial grade 0–70°C, shock-resistant, +5V power supply, standard 6U VME

II. 523A vs 523 vs 522A (The three most confusing models)

MVME162-522A: 8MB DRAM; Network port / SCSI are both optional; Basic style

MVME162-523: Engineering sample / Early version; 16MB DRAM; Network port + SCSI onboard

MVME162-523A: Final production version, 8MB DRAM; Network port + SCSI onboard (standard); Most commonly used, most spare parts

In one sentence: 523A = 522A + onboard network port + SCSI; 523 is the early 16MB version, 523A is the production 8MB version.

III. Main features

Integrated: CPU, memory, network port, SCSI, serial port, IP slot all in one, no need for subcards

High reliability: Industrial wide temperature, anti-vibration, supports VxWorks, pSOS real-time systems

Strong expansion: 4 IP slots, can add analog, digital, communication modules

Good real-time performance: MC68040 + VMEbus, suitable for hard real-time control

IV. Typical applications

Industrial DCS/PLC, process control

Embedded real-time control, robots

Military / aviation, communication, test measurement

** Scenarios requiring onboard network + local storage (SCSI)**

V. Spare parts and alternatives

Model: MVME162-523A (Common spare part number: 01-W3960Bxxx)

Direct replacement: MVME162-523 (Early version), MVME162-532A (High configuration)

Downward compatibility: Can directly replace 522A (note: network port / SCSI function needs to be enabled)