Description
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Product Introduction
When a legacy DCS operator station crashes repeatedly because a generic commercial ATX motherboard cannot recognize the old ISA fieldbus communication card, the root cause almost always traces back to a non-PICMG 1.0 board that lacks full legacy ISA bus compatibility.
Purpose-built for late 1990s to early 2000s industrial automation systems, this full-length PICMG 1.0 industrial single board computer uses the Intel 440BX AGPset chipset, supporting Slot 1 Pentium II/III processors. It integrates native PCI Rev 2.1 and ISA dual bus, making it fully compatible with legacy ISA field communication cards that generic modern motherboards cannot support. It also delivers 2–4 axis servo motion control with linear and circular interpolation, fitting directly into industrial PC PCI slots for CNC and laser cutting equipment.
MSPC-68866800
MSPC-68866800
MSPC-68866800
MSPC-68866800
Key Technical Specifications
| Parameter | Value |
|---|---|
| Standard Compliance | PICMG 1.0 |
| Supported CPU | Slot 1 Intel Pentium II / Pentium III / Celeron |
| Chipset | Intel 440BX AGPset + Intel 82371EB (PIIX4E) Southbridge |
| Memory Slots | 3 × 168-pin DIMM, max 256MB EDO/SDRAM |
| Display | Onboard ATI Rage Pro Turbo VGA, CRT output |
| Serial Ports | 2 × RS-232 COM, optional IrDA infrared |
| USB | 2 × USB 1.1 ports |
| IDE Interface | Dual-channel PCI Bus Master IDE, Ultra DMA/33, 4 devices max |
| Expansion Bus | PCI Rev 2.1 (5V) + ISA |
| Motion Control | 2–4 axis, linear / circular interpolation |
| Operating Temperature | 0°C to +50°C (industrial grade) |
| Dimensions | ~338 × 122 mm (full-length PICMG SBC) |
| Power Supply | +5V/+12V/-5V/-12V via PICMG backplane |
| Watchdog Timer | Onboard hardware WDT with soft CPU reset |
Field Application & Technical Pitfalls
This part runs three non-negotiable production-critical roles.
First, it acts as the replacement host motherboard for legacy DCS operator stations, restoring full compatibility with old ISA fieldbus communication cards that no modern commercial motherboard can recognize.
Second, it serves as the multi-axis motion control core for old CNC machine tools and laser cutting equipment, delivering stable 4-axis synchronous interpolation for complex motion trajectories.
Third, it functions as the embedded computing core for early power plant SIS historical data stations, running legacy historian software that only supports Windows NT/2000.
⚠️ CPU Slot Compatibility Risk: This board only supports Slot 1 interface Pentium II/III processors. It will not work with newer Socket 370 or later x86 CPUs, and forcing an incompatible CPU into the slot will permanently damage the motherboard.
⚠️ Memory Capacity Hard Limit: The maximum supported total system RAM is 256MB. If you install larger DIMM modules, the board will fail to boot and show no video output.
⚠️ Backplane Pin Alignment: The PICMG 1.0 backplane connector has strict pinout requirements. If you force the board into a non-PICMG custom backplane, you will bend the backplane pins and disable the entire industrial PC.
I watched a senior DCS maintenance tech skip the memory capacity check last summer. He installed two 256MB DIMMs into this board, expecting 512MB total RAM, and the board refused to boot completely. The team spent 2 hours troubleshooting before they found the 256MB hard limit. That 1-minute oversight forced the plant’s legacy DCS operator station to stay offline for half a shift.
Quality Control (QC) SOP & Transparency
- Inbound Verification: Cross-check the OEM serial number against Macrotek’s official part revision database, run anti-counterfeit validation on the board’s laser-etched serial label, and confirm no bulging capacitors or cracked solder joints on the 440BX chipset.
- Live Rig Testing: Mount the board in a certified PICMG 1.0 industrial PC test rack, install a Pentium III CPU and 256MB SDRAM, and verify 4 hours of stable Windows 2000 continuous operation.
- Parameter Testing: Confirm full PCI and ISA bus compatibility, verify onboard VGA, COM, USB and IDE ports all function correctly, and validate the hardware watchdog timer triggers CPU reset properly.
- Final QA & Packaging: Seal the fully tested board in a static-shielding anti-static bag, apply a unique QC passed serial label, and pack it in ESD-dissipative foam with a printed hard copy of the full functional test report.
Frequently Asked Questions
- Can I hot-swap this board while the industrial PC rack is powered on? No. The PICMG 1.0 backplane does not support hot-swap. Pulling the board live will cut all system power instantly, triggering uncontrolled DCS system shutdown.
- What exact industrial systems does this part work with? It is fully compatible with legacy PICMG 1.0 industrial PC systems, and widely used as a replacement board for old Foxboro I/A, Honeywell TDC3000 and Yokogawa Centum XL DCS operator stations.
- How long is the standard warranty for this new surplus unit? It carries a full 12-month functional warranty. If it fails within that window under specified operating conditions, we cover all return shipping and bench replacement costs.
- How do I tell a genuine OEM unit apart from a refurbished clone? Genuine units have the Macrotek hologram sticker on the side of the PCB, and the Intel 440BX northbridge carries the official Macrotek part number sticker. Refurbished clones usually skip the official hologram and use generic unmarked chips that cannot deliver full ISA bus compatibility.
- Will this MSPC-68866800 directly replace an older PICMG 1.0 SBC? No. Older PICMG SBC variants may have different BIOS revisions. You will need to re-verify all ISA card resource allocation settings in the Award BIOS after swapping.
- What’s the maximum safe continuous operating temperature at full 256MB RAM load? It will hold stable system operation up to 50°C, though your mileage may vary if the cabinet cooling airflow drops below 15 CFM and internal chipset temperatures spike 15°C above ambient.
