What Is an Arcade PCB Revision and Why Does It Matter?

By HighScoreSaves Technical Team

Reviewed and updated September 2, 2026

When identifying an original classic arcade game, knowing the game title is only the beginning. The PCB inside the cabinet may also have a specific board number, revision, manufacturer version, hardware configuration, or production variation.

Those differences can be important even when two boards run the same game and appear nearly identical during normal gameplay.

For collectors and technicians, PCB revision information helps determine which documentation applies to the board. For an original-PCB upgrade, it can also help determine whether the hardware matches the configuration for which the upgrade was designed.

What Does PCB Revision Mean?

PCB stands for printed circuit board. A revision identifies a particular version of that board design.

A manufacturer may revise a PCB during production for many reasons, including:

• correcting a design problem;
• changing component availability;
• rearranging traces or component locations;
• changing connectors or jumpers;
• supporting a different ROM configuration;
• simplifying manufacturing;
• changing the number or arrangement of boards in a board set; or
• making another engineering or production change.

A revision does not automatically mean the game itself plays differently. Some revisions may be electrically or functionally very similar, while others can contain differences that matter significantly during repair or modification.

How Is an Arcade PCB Revision Identified?

Revision information can appear in several places on an original arcade PCB.

Look for information such as:

• manufacturer names or logos;
• PCB assembly numbers;
• etched or printed board numbers;
• revision letters or numbers;
• silkscreen markings;
• copyright markings;
• component-location references;
• factory stickers; and
• ROM labels.

Not every board uses the same numbering system. One manufacturer may clearly print a revision letter while another may identify versions primarily through board assembly numbers or layout differences.

For the complete identification process, see How to Identify Your Original Arcade PCB Before Ordering a Kit .

Does a Different PCB Revision Mean It Is Not Original?

No.

A manufacturer can produce multiple legitimate revisions of the same original arcade hardware.

Two genuine boards can therefore have different component layouts, revision markings, ROM arrangements, or manufacturing details while both remaining original hardware.

That is different from a bootleg, reproduction, replacement board, or emulation platform.

For that distinction, read Original Arcade PCB vs. Replacement or Emulation Board: What’s the Difference? .

PCB Revision vs. ROM Revision: Are They the Same Thing?

No.

A PCB revision refers to a version of the physical circuit board or hardware design. A ROM revision refers to a version of the program or other ROM data installed on the board.

A particular PCB revision can sometimes operate with more than one software revision, and similar software may sometimes appear on more than one board revision.

This is one reason both the physical PCB and the ROM labels can be useful when documenting arcade hardware.

Learn more about program, graphics, and sound-related ROMs in Original Arcade ROMs Explained .

Can the CPU Change Between Arcade PCB Revisions?

Potentially, yes, although this depends entirely on the game and hardware family.

A revision can change component types, socket arrangements, support circuitry, or other details. Even if the processor family remains the same, its physical location or surrounding circuitry may differ.

That matters because many original-PCB upgrade systems interface with the CPU or CPU socket.

For processor fundamentals, see What Does the CPU Do on a Classic Arcade PCB? .

Why Does PCB Revision Matter for an Arcade Upgrade Kit?

An original-PCB upgrade is designed around specific hardware connections and expected component locations.

Depending on the game and kit, compatibility can involve:

• CPU type;
• CPU socket location;
• socket size and condition;
• ROM layout;
• board-to-board connectors;
• ribbon cables;
• adapters;
• jumpers;
• board revision; and
• other game-specific hardware.

A cabinet displaying the correct game does not by itself prove that the installed PCB matches the expected hardware.

This is why HighScoreSaves product pages and installation guides should be checked for the exact game before ordering or installing a kit.

Examples of Game-Specific Kit Compatibility

Different arcade platforms can have very different hardware requirements. HighScoreSaves therefore organizes upgrades around the actual game hardware rather than treating every PCB as interchangeable.

Examples include:

• Galaga Free Play and High Score Save Kits
• Donkey Kong Free Play, High Score Save, and Multigame Kits
• Pac-Man Free Play, High Score Save, and Multigame Kits

The correct product page and installation guide should always be used for the specific PCB and kit being considered.

Can a Bootleg or Reproduction Have Its Own Revision?

Yes, but revision markings on non-original hardware do not establish compatibility with an upgrade designed for an original PCB.

Bootleg, reproduction, conversion, and replacement boards may copy portions of an original design while changing CPU arrangements, ROM layouts, sockets, connectors, logic, or board dimensions.

A board that runs the same game can therefore be electrically different even if some component locations appear familiar.

See Will an Arcade Upgrade Kit Work on a Bootleg, Conversion, or Reproduction PCB? .

Factory Revision vs. Previous Repair

Not every difference you see on a vintage PCB is a factory revision.

After decades of service, a board may contain:

• replacement sockets;
• replacement ICs;
• jumper wires;
• cut traces;
• added components;
• removed components;
• repaired pads;
• replacement connectors; or
• other technician modifications.

A repair can make one board look different from another even when both originally left the factory as the same revision.

This is why photographs of both the component side and solder side can be useful when identifying unusual hardware.

Why Does Revision Matter When Using a Schematic?

A schematic represents a particular circuit design. If the manual or schematic applies to another revision, component references, connector pins, jumpers, or circuitry may differ from the board in front of you.

Before using a schematic for troubleshooting, check its title block, board numbers, revision information, and applicable game hardware whenever those details are available.

The next article in this series, What Is an Arcade PCB Schematic and How Do You Read One?, explains the structure of arcade schematics in more detail.

Why Does Revision Matter When Reading an Installation Guide?

An installation guide is written for a particular upgrade and supported hardware configuration.

If the CPU, socket, ROM locations, adapters, or board arrangement on your PCB do not match the guide, stop and identify the reason before continuing.

Do not assume the documentation is wrong simply because your board looks different. The cabinet may contain another revision, a previous repair, a conversion, or different hardware entirely.

See How to Read an Arcade Kit Installation Guide Before You Start .

What Should You Photograph Before Asking About Compatibility?

When the exact board revision is uncertain, useful photographs can include:

• the complete component side of the PCB;
• the complete solder side;
• all PCB numbers and revision markings;
• the CPU and surrounding components;
• ROM labels;
• edge connectors;
• ribbon cables and board-to-board connectors;
• jumpers or modifications;
• replacement sockets; and
• any unusual adapters or daughterboards already installed.

Clear documentation makes it much easier to compare the actual hardware with known configurations.

Key Takeaway

An arcade PCB revision is a particular version of the physical circuit-board design. Two original boards running the same game can have legitimate hardware differences, and those differences can matter when using schematics, replacing components, troubleshooting, or installing upgrades.

The safest approach is to identify the actual board inside the cabinet rather than relying only on the cabinet artwork or game title. PCB numbers, revision markings, CPU type, ROM labels, sockets, connectors, previous repairs, and photographs all help establish exactly what hardware you have.

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