DS3800HADA - Address Decode Circuit Board

DS3800HADA - Address Decode Circuit Board DS3800HADA - Address Decode Circuit Board

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Part Number: DS3800HADA
Manufacturer: General Electric
Series: Mark IV
Product type: Address Decode Circuit Board (L-Adr Decode Card)
Availability: In Stock
Country of Manufacture: United States (USA)

Functional Description

DS3800HADA is a L-Adr decode card developed by GE. It is a part of the Mark IV control system. The decoder/demultiplexer processes board signals and combines them into a single signal for transmission. It is not possible to configure the decoder/demultiplexer. Its primary function is to interpret memory or input/output (I/O) address signals and generate control signals that enable or select specific memory locations or devices.


  • The board has a number of pins that are linked together by tiny wires wrapped around the pins. It contains 8 jumpers for board configuration and 1 decoder/demultiplexer component.
  • The jumpers are one way to configure the board. It is best to setup the board before installing it in the drive. The qualified installer must confer with the engineers on site and go over the jumper configuration possibilities. The jumpers are pre-set at the factory at the default positions. These are the most frequently used setup options.
  • In addition, the board comes with a set of configuration instructions that explain the jumpers and how shifting the pins affects how the board operates.
  • Address Signals: In a digital system, memory and I/O devices are accessed using unique addresses. These addresses are typically provided by the microprocessor or controller as a binary number.
  • Address Decoding: The address decode circuit board takes these binary address signals as inputs and decodes them to identify which memory location or device is being accessed. This decoding process involves comparing the input address to a range of predefined addresses.
  • Control Signal Generation: Once the address is decoded, the circuit board generates specific control signals. These signals might include chip select signals, read/write signals, and other control lines that are required by memory chips or I/O devices to perform the desired operation (read or write).
  • Device Activation: The generated control signals are then used to activate the target memory chip or I/O device. For instance, if the address decode circuit determines that a particular memory address is being accessed, it generates the appropriate chip select and read/write signals to enable the corresponding memory chip.
  • Multiplexing: In more complex systems with multiple memory or I/O devices, multiplexing techniques might be employed. This means that a single address decode circuit board could control multiple devices, each associated with a unique address range.
  • Efficiency: Address decoding is essential for efficient system operation. Without proper address decoding, the processor might inadvertently access the wrong memory location or device, leading to data corruption or incorrect behavior.


  • It is simple to shift the jumpers once the installer consults with the operators and engineers. Open the static-protective bag and slip out the board just before you want to transfer the jumpers and install the board. Position the board atop the bag. Then, using the jumper IDs, locate the jumpers to be moved. The letter J is used to identify jumpers. Pull up on the jumper with your thumb and one finger to remove it. Alternatively, pick up the jumper with a small pair of pliers or another device. Cover the pins by sliding it over them.
  • Signals can be sent to multiple regions on the board for processing thanks to the tiny wires wrapped around the pins. A qualified servicer or installer can change the signal routing by adding or removing tiny wires. Only a competent technician will have the training to understand how to get a specific result by connecting the pins. Read the configuration instructions included with the original board to learn about the pins and how adding a wire can affect the processing.
  • To add a wire, open the sealed bag containing the board using a sharp knife. To take the board from the bag, hold it by the edges. When holding the board, avoid pressing down on any pins or components. This could bend or break the pins off the board. You must also keep static electricity at bay.
    This necessitates the acquisition of a wrist strap. Wear one end of the wrist strap around your wrist. The wrist strap is finished with a clip that you attach to a grounded metal surface. This surface could be a metal desk support or a metal stool leg.

System Historian features

  • The Historian functions as a data archival system employing client-server technology. Its core functionalities encompass the collection, storage, and presentation of power island data as well as auxiliary process information.
  • Its adaptable nature allows for customization based on specific needs. It can be tailored to exclusively handle turbine-related data or expanded to encompass a wider spectrum of applications, incorporating balance of plant process data.
  • This system amalgamates high-resolution digital event data sourced from the turbine controller with process analog data. This integration forms a sophisticated investigative tool capable of discerning cause-effect relationships. Leveraging archive products from OSI Software Inc. (PI Data ArchiveTM and PI-ProcessBook®), along with GE-developed data management functions, especially designed for high-speed turbine event digital data, this product utilizes advanced data compression techniques to significantly minimize storage media requirements.
  • The Historian comes equipped with a range of predefined database query forms, simplifying typical calculations and analyses related to turbine operations. Additionally, it leverages flexible tools such as PI-ProcessBook and PI-DataLinkTM, empowering operators to swiftly generate tailored trends and reports from the archived process data.

WOC is happy to assist you with any of your GE requirements. Please contact us by phone or email for pricing and availability on any parts and repairs.


What is DS3800HADA?
It is a L-Adr decode card developed by GE

What is the purpose of the jumpers on the board?
The jumpers on the board are used to configure the board's settings. They can be shifted to change how the board operates, and the board comes with configuration instructions to explain how shifting the jumpers affects its functionality.

How can the signal routing be changed on the board?
The signal routing on the board can be changed by adding or removing wires that are wrapped around the pins. The configuration instructions included with the board should be consulted before attempting to change the signal routing.