1. Brand & Core Positioning

• Brand: XYCOM (owned by Acromag / Xembedded, USA industrial VME platform)
• Model: XVME-655, 6U double-height double-width VME master single-slot CPU board
• Architecture: Intel Pentium PC/AT compatible embedded controller, far higher performance than older XVME-601 68K series CPUs
• Lifecycle: Fully discontinued OEM production; critical spare for legacy high-end extrusion, wide-web printing, heavy packaging, test bench VME racks
• Slave Compatibility: Works with all XVME series I/O boards (XVME-500/4, XVME-505/1, XVME-540, XVME-085)

2. CPU & Memory Hardware

Processor Options

Memory Configuration

• Main SDRAM: Up to 512MB 32-bit non-parity DIMM (standard fitted 64/128MB)
• Secondary Cache: 256KB / 512KB COAST L2 cache
• Boot Storage: Onboard Flash ROM, IDE interface for HDD/SSD, floppy SA-450 connector

3. PCI Local Bus & Onboard Controllers

1. PCI SVGA graphics: Resolutions up to 1024×768 for monitor output
2. Enhanced DMA IDE controller for mass storage
3. PCI-VME bridge chip (full VME master/slave translation)
4. Optional PCI 10BaseT/10Base2 Ethernet network card

4. VMEbus Full Compliance (IEEE 1014 Rev C.1)

• Address modes: A32 / A24 / A16
• Data widths: D64 / D32 / D16 / D08 (EO)
• Dual role: VME Bus Master (DTB) + VME Slave device
• Arbitration: R0–R3 bus requester, PRI/SGL/RRS release modes
• Interrupt system: Generate I1–I7 interrupts + handle IH1–IH7 interrupt vectors
• Drives global SYSCLK, SYSRESET system rack signals

5. Front Panel External I/O Interfaces

1. 2× 16550 UART serial ports: Jumper selectable RS232 / RS422 / RS485
2. 1× EPP/ECP IEEE1284 parallel port (printer/debug)
3. PS/2 keyboard + PS/2 mouse ports
4. Optional dual USB 2.0 host ports (late revisions)
5. VGA video output, floppy header, IDE drive header

6. Electrical Power Specifications

• Powered from VME backplane +5V, +12V, -12V rails
• Typical draw: 5.0A @ +5V; Max full load: 6.4A @ +5V
• Passive + auxiliary fan cooling design for sustained high-speed CPU operation

7. Mechanical & Environmental Ratings

• Form factor: 6U double-height double-width VME (233.35mm × 160mm)
• Net weight: ~0.72kg
• Operating temp: 0°C ~ +50°C (extended industrial -40°C ~ +85°C conduction-cooled variants)
• Humidity: 5%–95% non-condensing; resistant to factory shock/vibration & EMI
• Certifications: CE, UL industrial safety compliant

8. Operating System & Software Support

• Native PC/AT compatible OS: DOS, Windows 95/98, QNX, VxWorks, OS-9 real-time systems
• No proprietary monitor firmware lock-in; standard x86 compiler toolchains for custom control logic
• Replaces slow 68000-based XVME-601/602 racks for upgraded compute capacity

9. Typical System Rack Layout

• XVME-500/4 (32ch Analog Input)
• XVME-505/1 (4ch Voltage Analog Output)
• XVME-085 (Custom Prototyping I/O)