Firmware on Chips: What a TCQB PROM Set Is

This is not a circuit board — it is the firmware that makes one run. The DS200TCQBF1B, supplied here at revision DS200TCQBF1BAD, is a programmed PROM (EPROM) chip set for GE's Mark V TCQB extended analog I/O board. The TCQB's on-board programmable logic executes code stored in socketed memory modules, and those modules are exactly what this listing supplies. Across the surplus market, the F1-series numbers are cataloged as Mark V software PROM sets — distinct from the G-series numbers that identify the boards themselves.

Why firmware ships separately at all: TCQB hardware is generic until programmed. Replacement boards are routinely supplied without EPROMs installed, on the assumption that your existing modules — carrying your unit's code at your revision — will transfer across. When they cannot, this is the part you are actually missing.

When You Need a PROM Set — and When You Don't

• You need one when a board swap is planned and the original EPROMs are damaged (bent or corroded pins, cracked packages), lost, or unreadable; or when you want a programmed spare set on the shelf next to a spare board.
• You may not need one when the old board is available and its modules are intact — GE's procedure moves them to the new board with anti-static precautions, and they carry your correct code by definition.
• Reseat before you replace. A recurring theme in Mark V field threads: intermittent diagnostics and configuration errors traced to nothing more than aged PROM pins making poor socket contact. A veteran control.com contributor lists PROM-set pin corrosion among the standard suspects for intermittent core trouble, right alongside ribbon cables. Wrist strap on, reseat, retest — the fastest "repair" in the Speedtronic world.

Reading DS200TCQBF1BAD: F-Group and Firmware Revision

The structure mirrors GE board numbering with one substitution: DS200 (series) + TCQB (the board family the firmware serves) + F1 (a firmware/PROM set group, standing where a board's G-group would) + BAD (revision letters). On firmware, revision is not a nicety — it is the content. Sets circulate in the market at multiple revisions, and the letters determine which code your chips hold. Quote the full string from your existing chips' labels, and tell us the board (for example, DS200TCQBG1B) and the application it must run. General numbering background: GE Speedtronic Part Number Decoder. One caution from our own sourcing work: this number is occasionally mislisted by resellers as an I/O board — it is a chip set, and that is what we supply and warrant.

Handling and Installing EPROM Modules Safely

The chips are static-sensitive and mechanically delicate, and GE's manual guidance is specific:

• Wear a grounded wrist strap for all handling; keep modules in static-protective bags between steps.
• Remove modules by prying gently with a flat blade, staying clear of neighboring components; store them safely until installation.
• Install by aligning module to socket and pressing straight down until no gap remains; visually verify full seating.
• Inspect pins for corrosion or deformation before installation — a bent pin found on the bench costs nothing; found at commissioning, it costs the outage window.

Matching Firmware to Board and Application

The TCQB — the extended analog I/O card at location 3 of the <R>, <S>, and <T> control cores, extension partner of the TCQA analog card — behaves according to this code plus the panel's I/O configuration constants. Mismatched or badly seated firmware announces itself as configuration errors, missing-card indications, or diagnostic alarms at core boot. If you are pairing this set with replacement hardware, we stock the boards as well — see the GE Mark V DS200 Boards collection and the family guide in GE Mark V DS200 Boards Explained — and can quote board plus PROM set as a package. Mark VI-era equivalents are a different architecture entirely; orient with Mark V vs Mark VI: DS200 to IS200.

How to Get an Accurate Quote for a PROM Set

• Full part number from the chip labels: DS200TCQBF1BAD — every letter, including the final revision pair
• Photos of the chip labels if available — the single most useful item for firmware
• The board part number it will run on, and your panel configuration (Simplex or TMR)
• Turbine model and, if known, application revision details from your site documentation
• Quantity of sets, urgency, destination country

Submit through Request a Quote; our team responds within 24 hours. This set is supplied in the condition stated below, ships worldwide DDP with duties handled by us, and can be ordered against your purchase order.

General Information about the Product
Part Number	DS200TCQBF1B Mark V DS200
Description	GE General Electric DS200TCQBF1B DS200TCQBF1BAD IC Chip Prom Set
Condition	used Clean and Tested. With 1 Year Warranty