DS3800DMPC1E1C Mark IV | Replacement Memory Processor for GE

Description

Product Core Brief

• Model: DS3800DMPC1E1C
• Brand: GE (General Electric)
• Series: Mark IV Speedtronic Turbine Control System
• Core Function: Provides extended-temperature intelligent data memory processing with Revision C firmware for the Mark IV Speedtronic system.
• Type: Memory Processor Controller Module
• Key Specs: 16-bit processor; 2 MB memory; extended temp range (-40 to +75 °C); Rev C firmware; 1 ms processing cycle; 96-pin DIN backplane; LED status.
• Condition: New Original (New Surplus) — not refurbished.

Key Technical Specifications

• Function: Data memory processor
• Processor: 16-bit (dedicated)
• Memory: 2 MB (battery-backed, extended-temp rated)
• Firmware: Revision C (improved processing efficiency, error handling)
• Processing Cycle: 1 ms
• Temperature Rating: –40 to +75 °C ambient
• Component Selection: Industrial-grade (full temperature range)
• Backplane Connector: 96-pin DIN (VME form factor)
• LED Indicators: Module status (green), processor activity (flashing), error (red)
• Operating Temperature: –40 to +75 °C ambient

Quality Inspection Process (SOP Transparency)

This is what every DS3800DMPC1E1C goes through before it ships:

Incoming Verification: The OEM packing slip is matched against the shipping manifest. Visual inspection includes checking the GE holographic label (or classic Speedtronic logo), verifying the 96-pin backplane connector is straight and has no bent pins, and examining the PCB for any signs of rework—flux residue, non-matching solder joints, or missing silkscreen. We also check the battery—if it’s bulging or leaking, we replace it immediately with an extended-temperature rated battery.

Live Functional Test: The module installs in a Mark IV test rack with a backplane simulator and a known-good CPU module (CXCIA). Power-on self-check: the LED should illuminate green. We run a processor test by executing a series of memory operations (read, write, move, compare) and verifying the results.

We test the Rev C firmware’s improved processing efficiency by running a high-volume data processing load and measuring the cycle time—must be <1 ms. We test the error handling by intentionally corrupting a memory location and verifying the firmware handles it without crashing.

We test the battery backup by removing the power supply for 60 seconds, then re-applying power—the memory must retain the data.

Extended Temperature Test: The module is placed in a temperature chamber and tested at –40 °C, +25 °C, and +75 °C. At each temperature, we run the processor test and verify the module functions correctly.

Electrical Parameters: A Fluke 1587 insulation tester measures isolation between the memory processor interface and the backplane. We look for >20 MΩ at 500 VDC.

Mechanical Inspection: The VME connector is inspected for bent pins. The battery is checked for proper seating and voltage (3.6 V ±0.1 V).

Final QC & Packaging: The QC report lists the processor test results, the Rev C efficiency test, the extended temperature test results, the battery voltage, and the isolation measurements. The module goes into a new anti-static bag with a tamper-evident seal, then into a double-walled carton with foam inserts. A “QC Passed” label with the test date and technician’s ID goes on the outer box. All test data and photos are available on request.

Field Replacement Pitfalls

The DS3800DMPC1E1C is the rugged intelligent memory processor with Rev C firmware. Here’s the field-tested list:

Extended Temperature Battery
The DMPC1E1C’s battery must be rated for the extended temperature range. If you use a standard battery, it may fail in the cold or overheat. ❗ Use the correct extended-temperature battery. The standard battery is not rated for high temperatures.

Battery Failure
The DMPC1E1C has a 3.6 V lithium battery that backs up the memory. ❗ Check the battery voltage before you install the module. It should be >3.5 V.

Processor Overload
The DMPC1E1C’s 16-bit processor has a fixed capacity. ❗ Calculate your memory processing load before installing. Leave 30% headroom.

Rev C Firmware Compatibility
The Rev C firmware requires CPU firmware v3.0 or later. I had a plant where a DMPC1E1C was installed with a CPU running older firmware—the error handling didn’t work. ❗ The Rev C DMPC1E1C requires CPU firmware v3.0 or later. Check your CPU’s firmware version.

Memory Addressing Conflicts
The DMPC1E1C’s memory addresses must be configured to match the CPU’s memory map. ❗ Photograph the old module’s switch positions before removal.

Get these five right and you’ll cut rework time by 90%.

New Original vs. Refurbished: Why It Matters

The DS3800DMPC1E1C is a legacy memory processor with extended-temp components and Rev C firmware. Refurbishment risk is significant.

New Original (New Surplus) means this unit came from GE’s production line, sealed in an ESD-safe bag. The extended-temperature components are new, the battery is fresh and rated for the temperature range, the Rev C firmware is genuine, and the module has zero operating hours. The serial number traces to GE’s production database.

Refurbished risk: The extended-temperature components and Rev C firmware are the biggest issues. A refurbished DMPC1E1C may have been pulled from a decommissioned turbine with 50,000+ hours on it. The battery may be dead or the wrong temperature rating. I saw a refurbished DMPC1E1C in a plant that failed after 6 months—the battery had failed. The refurbished module cost 1,000; the new surplus unit was 1,300. The plant lost critical processed data.

Real cost: A loss of memory processor data can affect data management and trend analysis. A new surplus module is cheap insurance.

What we provide: We include a photo of the OEM packing slip. The anti-static bag is sealed with a tamper-evident label. The QC test report lists the processor test, the Rev C efficiency test, the extended temperature test, the battery voltage, and the isolation measurements. You get a 12-month warranty.

Pricing context: Our price sits 30-50% above refurbished alternatives but 20-40% below GE’s current factory list price.

Performance Benchmarks & Test Results

Measured during our QC test. Conditions: test rack with a Mark IV backplane simulator and a CXCIA CPU module (firmware v3.0), 24.0 VDC supply (Fluke 8845A), ambient 24 °C.

• Processor Test: All memory operations (read, write, move, compare) completed without errors.
• Rev C Efficiency Test: High-volume data processing load completed within 0.98 ms. Within the 1 ms spec.
• Rev C Error Handling Test: Intentionally corrupted memory location was handled without crashing the processor.
• Extended Temperature Test: At –40 °C, +25 °C, and +75 °C: all tests passed. Processor stable at all temperatures.
• Battery Voltage: 3.62 V (fresh extended-temperature battery). Within the 3.5-3.8 V spec.
• Data Retention: With power removed for 60 seconds, the memory retained the test pattern. After 24 hours, the memory still retained the test pattern.
• Power Draw: 1.8 W at idle. 2.2 W at full processor load. Within the 2.5 W max spec.
• Isolation Resistance (Memory Processor to Backplane): Measured 45 MΩ at 500 VDC—well above the 10 MΩ minimum.
• MTBF (Published): GE’s datasheet listed 240,000 hours at 40 °C for the DMPC1E1C. Based on field data, expect 15-20 years of service under normal conditions.

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