XYCOM XVME-675 VMEbus PC/AT 486DX4 High-performance Processor Module

I. Brand and Product Positioning

Brand: XYCOM (belongs to Acromag Xembedded, an established VME industrial control platform in the United States)

Model: XVME-675 (sub-models XVME-675/18, XVME-675/19), a 6U single-slot VME PC/AT compatible main control CPU board

Performance Level: Upgraded 486 architecture, with computing power higher than XVME-674 (33/66MHz 486), lower than Pentium architecture XVME-655; the main controller of the entire VME rack system, driving all XVME analog/digital I/O board cards

Life Cycle: Completely discontinued by the original manufacturer, only refurbished boards with full load testing + a small amount of new original inventory are available; it is a core replacement spare part for old production lines such as extrusion, wide-format printing, and heavy packaging

Lower-level Compatibility: Perfectly compatible with XVME-500/1, XVME-500/4, XVME-505/1, XVME-540, XVME-085; all XVME series slave I/O modules

Core Computing Hardware Configuration

1. Processor CPU

Intel 80486DX4 @100MHz, with built-in hardware FPU floating-point operation unit, 16KB on-chip first-level cache, significantly improving VME read and write speed through pipeline bus architecture

2. Dual-channel System Memory

Fixed two hardware configurations:

XVME-675/18: 16MB Dual-Access DRAM

XVME-675/19: 32MB Dual-Access DRAM (top-of-the-line high-capacity)

3. Onboard Storage Controller

Dual IDE hard disk interfaces, supporting 2.5/3.5 inch industrial hard drives/SSDs

Standard floppy drive FDC controller (compatible with 360KB–1.44MB floppy disks)

256KB EPROM firmware, on-board lithium battery to maintain CMOS clock and parameter configuration

4. VME Bus Master Control Capability (IEEE 1014 standard)

Bidirectional roles: VME Bus Master host + VME Slave slave

Address/Data Width: A32/A24/A16 address; D32/D16/D08 data transmission

Unique programmable byte exchange hardware, significantly optimizing cross-bus software read and write efficiency

Complete interrupt system: capable of generating/responding to VME IRQ1–IRQ7 seven-level hardware interrupts; supports R0–R3 four-level bus arbitration, SYSCLK system clock, SYSRESET global reset driver

Supports dual CPU redundancy hot backup, seamless fault switching (high-end model configuration)

5. Display Graphics Subsystem

Onboard Super VGA controller, paired with 1MB independent graphics memory:

Maximum resolution: 1024×768 @256 colors

Supports BitBLT graphics acceleration engine, compatible with standard VGA display output

 Front Panel Standard PC/AT Peripheral Interfaces

Dual 16550 UART serial COM ports

Hardware switch for RS232/RS422/RS485, maximum baud rate 115.2kbps, for connecting HMI, Modbus devices, and debugging PC

PS/2 standard keyboard + PS/2 mouse interface

IEEE1284 parallel printing ports Expansion slots: Reserved PC/104 expansion slots, allowing for the installation of network cards and dedicated communication subcards

Status LED indicators: POWER for power supply, PASS for normal operation, FAIL for fault alarm, and HARDWARE RESET for reset button

 Electrical Power Consumption and Mechanical Specifications

Power supply: Fully derived from the VME backplane + 5V, +12V, -12V power rails

Typical power consumption: +5V 4.9A; +12V 4.2A; maximum full load +5V 6.1A, +12V 5.2A

Heat dissipation: Low-power passive heat dissipation design, optional conduction heat dissipation reinforced wide-temperature version, no need for forced fans

Form factor: Standard 6U single-height VME 233.35mm × 160mm

Net weight: Approximately 0.52kg; PCB with triple protection coating, resistant to dust, humidity in the workshop

Environmental Reliability Indicators

Standard industrial operating temperature: 0℃ ~ +50℃

Reinforced wide-temperature version: -40℃ ~ +85℃ conduction heat dissipation model

Humidity: 5%–95% without condensation; resistant to industrial EMI electromagnetic interference, mild vibration and shock

Compliance certifications: CE, UL industrial safety certification XYCOM XVME-675 VMEbus PC/AT 486DX4 high-performance processor module