Description
Product Core Brief
- Model: GE Fanuc VMIVME-7750-746000
- Brand: GE Fanuc (now Abaco Systems / GE Automation)
- Series: VMIVME-7750 Series VME Single Board Computer (SBC)
- Core Function: High-performance embedded controller for VMEbus systems
- Product Type: Single Board Computer (SBC)
- Key Specs: Intel Pentium III Processor VME64 Interface Dual Ethernet PMC Expansion
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GE VMIVME-7750-746000
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Key Technical Specifications
- Processor: Intel Pentium III (Frequency typically 933 MHz or 1.0 GHz for this suffix)
- Memory: Up to 512 MB SDRAM (Soldered for high vibration resistance)
- VMEbus Interface: Tundra Universe II bridge (supports VME64)
- Flash Memory: 128 MB CompactFlash (Integrated) + 32 KB Non-volatile RAM (NVRAM)
- Network: Dual 10/100 Mbps Ethernet ports (Front Panel RJ45)
- Video: Integrated AGP SVGA Controller with 4 MB VRAM
- I/O Ports: 2 x RS-232 COM ports, 1 x Parallel Port, 1 x PS/2 Keyboard/Mouse
- Expansion: Two IEEE 1386.1 compliant 32-bit/33 MHz PMC slots
- Storage: Ultra DMA/100 EIDE support; Floppy disk interface
- Operating Systems: Windows NT/2000, VxWorks, QNX, Linux, and Solaris
Application Scenarios & Pain Points
The VMIVME-7750-746000 is the “engine room” for many legacy VMEbus systems. You’ll find these primarily in defense, aerospace, and high-end industrial simulation. The 7750 series was famous for bridging the gap between standard PC architecture (Intel/Windows) and the rugged VMEbus.
The primary pain point today is hardware aging. These boards often run 24/7 in harsh environments. The most common failures are the RTC (Real-Time Clock) batteries dying—which can cause BIOS checksum errors and prevent booting—and the aging of electrolytic capacitors. When an SBC fails in a VME rack, the entire system—PLC, I/O, and communication—effectively loses its brain. Since GE has transitioned away from this product line, getting a brand-new unit with the specific “-746000” suffix (which denotes a specific memory and processor configuration) is becoming increasingly difficult.
Typical Application Scenarios:
- Defense & Aerospace – Flight Simulators Managing real-time processing and I/O coordination for pilot training systems.
- Semiconductor Manufacturing – Wafer Processing Controlling high-precision robotic movements and gas flow timing in cleanrooms.
- Power Grid – Substation Automation Acting as the central gateway for data concentration and protocol conversion in legacy utilities.
- Research – Particle Physics / Accelerators High-speed data acquisition where deterministic VMEbus timing is required.
Case Study: The “Brain Dead” Radar Controller
Background: A maritime traffic control center was using a VME-based radar processing system. The heart of the rack was a VMIVME-7750.
The Problem: After a scheduled power maintenance, the system failed to boot. The front panel LEDs showed a “CPU Halt” status. The facility was essentially blind to coastal ship traffic. The OEM’s suggested “upgrade” involved a total software rewrite and a $1M hardware overhaul.
The Solution: We supplied a New Surplus VMIVME-7750-746000. Before shipping, we verified the BIOS settings to ensure it would recognize the client’s proprietary PMC (PCI Mezzanine Card) that sat on the SBC.
Result:
- Recovery: The board was installed and the existing CompactFlash card was moved over. The system booted into VxWorks immediately.
- Downtime: Reduced from a projected 6-month migration to 4 days of shipping and installation.
- Outcome: The radar system was restored to 100% functionality without a single line of code being changed.
GE VMIVME-7750-746000
Compatible Replacement Models
The VMIVME-7750 has many variations. The suffix digits “746000” are critical for determining the specific processor speed and RAM capacity.
Original Model Replacement/Alternative Compatibility Key Differences Change Required VMIVME-7750-746000 VMIVME-7750-745000 ⚠️ Software Compatible Slightly less RAM or different CPU frequency. Check if software requires specific memory address space. VMIVME-7750-746000 VMIVME-7740 ❌ Incompatible Older architecture; different BIOS and chipset. Not a drop-in replacement. VMIVME-7750-746000 Abaco V7768 ⚠️ Hardware Compatible Modern VME SBC successor (Pentium M / Core Duo). Requires total OS/Driver reinstall. Troubleshooting Quick Reference
Symptom Possible Cause Related to 7750? Quick Check Action “BATT” LED On / BIOS Error RTC Battery Dead ✅ High Check system time in BIOS. Replace BR2330 coin cell battery. System Boots to “No OS found” CF Card Failure ❌ Low Try the CF card in a different reader. Replace CompactFlash card and reload image. VME Bus Error (BERR) Address Conflict ⚠️ Medium Check VME jumper settings or Tundra Universe config. Ensure no other board is using the same VME address. Random Reboots / Freezing Power Rail Noise ⚠️ Medium Measure +5V and +12V rails on the VME backplane. Check/Replace the VME Power Supply module. No Video Output VGA Chip/Cable Fault ✅ High Test with a known good VGA cable and monitor. Replace SBC if integrated VGA is fried. ❗ Pro-Tip: The “NVRAM” Backup
Before you pull a failed 7750 board, if it’s still partially functional, try to dump the 32 KB NVRAM. Many industrial applications store machine-specific calibration data in that NVRAM. If you move your PMC cards to a new board but don’t have the NVRAM data, the machine might act “lost” or uncalibrated.
