New-Surplus DS3800HRMB1N1L Battery ROM PCB

This DS3800HRMB1N1L is supplied as new surplus in the original factory package, making it a clean choice for a Mark IV Battery ROM spare that has never been placed in service. It is the same GE Speedtronic DS3800 memory board covered under the HRMB function, in the 1N1L group. For a plant running an obsolete Mark IV panel, an unused spare is often the most reliable way to guarantee the part is on hand when it is finally needed.

What the HRMB Stores and Why It Is Called a ROM Board

The HRMB is the card that holds the control's read-only memory. Its ROM modules store the program code the Mark IV microprocessors execute; those processors sit on other cards and pull their instructions from this board through the modular connector at one end. The board also carries an analog-to-digital converter, a 40-pin ribbon-cable connector, a 20-pin connector, seven jumpers, and a reset toggle switch. It installs into the DS3800 rack on a modular connector, held by retention levers at the opposite end.

Populating Sockets and Moving Memory Modules Safely

One practical point separates memory boards from most other cards: what is in the sockets matters as much as the board itself.

• Check whether modules are included. Some replacement HRMB boards ship with empty sockets, on the expectation that you will transfer the memory modules from your existing card. Confirm what is populated before you plan the swap.
• Move modules carefully. To relocate a module, ease a screwdriver under it and lift evenly to free it, then press it firmly into the socket on the replacement board so it is fully seated.
• Keep firmware compatibility in view. The stored code must suit your application; a module or board carrying the wrong firmware revision may not behave as a drop-in.
• Seat the board with care. The 1N1L is a heavier card; use both hands, and make sure the retention levers lock it so it cannot shift in the rack.

The 1N1L Suffix in the DS3800 Naming Scheme

GE builds the number from DS3800 (Mark IV board series), HRMB (Battery ROM function), and 1N1L (the group code that identifies this version and revision). Because different HRMB group codes are populated with different components and firmware, the suffix is an exact-match field, not a formality. Our GE Speedtronic Part Number Decoder lays out how to read it, and if you are weighing a longer-term control migration, the Mark V vs Mark VI: DS200 to IS200 guide shows how the numbering evolved after the DS3800 era.

Browse Related GE Mark IV DS3800 Boards

See the rest of the family in our GE Mark IV DS3800 Boards collection, or the wider GE Speedtronic Turbine Control Boards listing.

Request a Quote for This New-Surplus Board

Send us the complete part number with the 1N1L suffix, a photo of the board label and any firmware or EPROM markings, the jumper configuration if known, your turbine model, Mark generation, quantity, and timeline. We will confirm the match and availability, respond within 24 hours, ship worldwide DDP, and accept purchase orders.