By the Arcade Home UK — The UK's Independent Arcade Machine Buyer's Guide Team · Updated May 2026 · Independent, reader-supported

Original ROMs vs Emulation Arcade Machines UK: What's the Difference?

When you're browsing arcade cabinets for your home in the UK, you'll quickly encounter two distinct camps: machines running original ROMs on licensed hardware, and machines using emulation software like MAME on platforms like Raspberry Pi. Both deliver playable classic games, but they're fundamentally different approaches with real trade-offs. Understanding the distinction matters if you want the right machine for your space and budget.

What are original ROMs and how do they work?

Original ROMs are the actual game code extracted from the memory chips inside classic arcade cabinets—usually from the 1970s through 1990s. When you have authentic ROM files, they contain the exact binary data that ran on the original arcade hardware: Atari's Centipede, Namco's Pac-Man, or Capcom's Street Fighter II, precisely as players experienced them in arcades decades ago.

Licensed arcade cabinet manufacturers in the UK use several approaches to run these original ROMs. Replica cabinets from brands like Arcade1Up or commercial manufacturers include officially licensed hardware boards that are either the original PCBs or modern recreations designed to play original ROM data. Some higher-end custom builders integrate genuine original circuit boards into new cabinets. When a machine uses authentic hardware, the ROM files are loaded onto that specific board—whether it's a genuine classic Jamma board or a modern licensed equivalent—and the games run natively, without software translation.

The key advantage is fidelity. Original ROMs on original or licensed hardware produce the exact experience: timing, frame rates, input responsiveness, even visual quirks and glitches that were part of the original arcade experience. There's no middle-layer software trying to interpret what the game should do—it's running as intended.

What is emulation in arcade machines?

Emulation takes a different route. An emulator is software that mimics the behaviour of classic arcade hardware on modern platforms. MAME (Multiple Arcade Machine Emulator) is the most respected open-source emulator for arcade games, supporting thousands of titles. Inside a Raspberry Pi-based cabinet or a PC arcade build, MAME reads the ROM files and translates the original machine code into instructions the modern processor understands, rendering the output on your modern screen or CRT.

This approach is popular in UK hobby communities because it's affordable and flexible. A Raspberry Pi costs £35–£80. You can build a decent emulation cabinet for £150–£400, then add hundreds or even thousands of games on a single compact unit. The software is free, and the community constantly improves emulation accuracy.

Emulation also introduces variables. Some games run perfectly; others have minor timing differences, slightly inaccurate colours, or input lag. Modern emulators like MAME are remarkably accurate, but they're still software approximations of 40-year-old hardware, not the real thing.

Key differences between original ROMs and emulation

Hardware: Original ROMs need licensed or genuine arcade circuit boards. Emulation runs on cheap modern platforms like Raspberry Pi, laptops, or dedicated mini PCs.

Game library: Original ROMs are tied to physical boards designed for specific games or families of games. A Pac-Man board plays Pac-Man variants; a Capcom CPS2 board plays Capcom arcade games from that generation. Emulation on a single Raspberry Pi can play thousands of games across dozens of hardware platforms.

Accuracy and authenticity: Original hardware delivers pixel-perfect, cycle-accurate reproduction. Emulation is very good—often indistinguishable to most players—but it's an approximation. Games occasionally run slightly faster or slower, colours might shift, or input lag might be a frame or two.

Cost: Licensed cabinets with original ROM support start around £500–£3,000. Building a Raspberry Pi emulation cabinet costs £150–£500, including the arcade stick and cabinet shell.

Repairability: Original arcade boards are decades old. Finding replacement chips or repairs can be challenging and expensive. Emulation on a Raspberry Pi is straightforward—if something fails, you replace the unit cheaply.

Longevity: Original hardware fails eventually; components degrade. Emulation software, once stable, runs indefinitely on whatever platform you choose, provided you keep the hardware serviceable.

Legality and authenticity

This is where clarity matters. Original arcade ROMs are copyrighted material. Playing them requires either legitimate ownership of the game, a licence from the copyright holder, or operating in specific legal grey areas. In the UK, copyright typically lasts 70 years after the author's death, so classic arcade games remain protected.

Licensed replica cabinets (like those sold by major manufacturers in the UK) have negotiated rights with copyright holders. You're paying partly for the game licences included. This is the clearest legal path.

Emulation itself isn't illegal—MAME is legal open-source software. However, ROM files are copyrighted. Using emulation with legally obtained ROMs (games you own on original cartridges or boards, or licensed compilations) is legally sound. Using emulation with unlicensed ROM downloads exists in a legal grey zone that most UK retailers and hobbyists avoid.

Which should you choose?

Choose original ROMs if you prioritise authenticity, want the precise original experience, or are willing to invest more. It's the "correct" approach for purists.

Choose emulation if you want flexibility, thousands of games, affordability, and you're comfortable with software approximations. It's practical for UK hobbyists wanting variety without breaking the budget.

Many enthusiasts do both: an original licensed cabinet for their favourite game, plus a Raspberry Pi setup for experimentation and discovery. There's no single right answer—it depends on your priorities, budget, and what draws you to arcade gaming in the first place.