DS3800HRMB1C1B: Battery ROM and A/D Converter Board for Mark IV

The DS3800HRMB1C1B is a GE Speedtronic Mark IV (DS3800) card from the HRMB family, which General Electric documents as a Battery ROM board. This particular unit is cataloged with its analog-to-digital converter role highlighted, and that captures the card's two jobs well: it carries the read-only memory that stores the program code the control runs, and it hosts the analog-to-digital conversion that turns analog signals into the digital values the Mark IV processes throughout the control.

Two Jobs on One Card: Firmware Storage and Analog Conversion

On the memory side, the HRMB is populated with ROM modules that hold the programming code executed by the microprocessors controlling the turbine. Those microprocessors physically live on other cards in the rack; they reach across and fetch their instructions from the HRMB through the modular connector at one end of the board. On the signal side, an on-board analog-to-digital converter digitizes analog inputs so the rest of the control can work with them in digital form. The board also carries a 40-pin connector for a ribbon-cable link to other cards, a 20-pin connector, seven jumpers, and a reset toggle switch — the same physical layout GE used across the HRMB group.

Before You Condemn the ROM Board

Memory and converter boards are often replaced for faults that originate elsewhere. Rule these out first:

• Try the reset toggle. The board's reset switch lets a trained servicer restart it without removing control power. Intermittent or unexplained processing errors are frequently caused by control signals arriving out of sequence or corrupted — from cable interference or a small power variation — rather than by a failed board, and a reset can clear them.
• Reseat the ribbon cable. Check the 40-pin connector and its retention latches. A cable that is partly unlatched or routed against a noise source produces exactly the kind of erratic behavior that looks like bad memory.
• Confirm the processor card. Because the HRMB only stores code that another card executes, a fault in that processor card can masquerade as a ROM problem.
• Check power and jumper settings. Verify the supply feeding the rack and that the seven jumpers match the configuration of the card you are replacing.

How to Read the DS3800HRMB1C1B Part Number

The number is assembled from DS3800 (the Mark IV board series), HRMB (the Battery ROM function), and 1C1B (the group code that identifies this version and revision). Group codes matter a great deal on memory boards, because different codes across the HRMB family carry different populated components and firmware. Match the suffix exactly, and remember that any stored code or EPROM content has to suit your specific application. Our GE Speedtronic Part Number Decoder walks through the naming.

Companion Processor and Memory Cards

The HRMB is not much use in isolation — it exists to serve the processor cards that read it, alongside the analog and I/O boards of the DS3800 rack. You can find the family in our GE Mark IV DS3800 Boards collection, and the broader GE Speedtronic Turbine Control Boards range if you maintain multiple Speedtronic systems.

What We Need to Quote the DS3800HRMB1C1B

Please send the full part number with the 1C1B suffix, the jumper or revision configuration if you have it, a clear photo of the board label (including any firmware or EPROM markings), your turbine model, the Mark generation, the quantity, and your urgency. That detail lets us match the right card the first time. Request a Quote for a reply within 24 hours; we ship worldwide DDP and accept purchase orders.