Sega X Board comes to MiSTer FPGA with After Burner II, Thunder Blade and more

MiSTer FPGA has added support for Sega’s X Board arcade hardware, bringing a fresh batch of late 1980s Sega games to DE10-Nano systems. The list includes After Burner, After Burner II, Thunder Blade, Super Monaco GP, Racing Hero, A.B. Cop, GP Rider, Last Survivor and Line of Fire. That’s a strong line-up straight away. The new core recreates the main parts of Sega’s X Board hardware rather than handling each game as a separate case. That means MiSTer is reproducing the processors, graphics systems and sound hardware that originally powered these machines in arcades. For anyone interested in Sega’s arcade output from the late 1980s, that matters. X Board sat right in the middle of a period when Sega was pushing hard on speed, scaling effects and large moving sprites.

Sega X Board was built around movement

Sega introduced the X Board in 1987 as a successor to some of its earlier arcade hardware. It used two Motorola 68000 processors, with a Z80 handling audio duties, plus dedicated hardware for sprites, tilemaps and road effects. On paper, that sounds fairly technical. On screen, the idea was simple: make everything move fast.

Aircraft rushed towards the player. Roads stretched into the distance. Cars, motorcycles and scenery changed size constantly as they crossed the screen. Sega used those tricks to create a convincing sense of depth without relying on polygonal 3D graphics. The hardware worked especially well for racing and shooting games, which explains much of the X Board catalogue.

Super Monaco GP used it for Formula One-style racing. Racing Hero put the player on a motorcycle. A.B. Cop went for a futuristic bike chase. Thunder Blade mixed helicopter combat with changing viewpoints, while Line of Fire used the board for a light-gun shooter. It wasn’t a one-game platform.

After Burner II is still the big attraction

For most players, though, After Burner II will be the first game they associate with X Board. Released in 1987, After Burner II puts the player behind an F-14 Tomcat and throws enemies at the screen almost immediately. You fire the cannon, lock missiles onto targets and keep moving. There isn’t much downtime. That’s the point.

The game creates speed through aggressive sprite scaling. Enemy aircraft grow rapidly as they approach, missiles streak across the screen and the landscape keeps rushing underneath the player. X Board hardware handles all of that movement while keeping the action readable.

Sega also built several cabinet types for the game. The large sit-down machines could move with the player’s controls, banking and tilting during play. Smaller cabinet versions were produced as well, so operators didn’t need the full mechanical setup to run the game. After Burner II is also a slightly unusual sequel.

It arrived only months after the original After Burner and worked more like an expanded revision than a completely separate follow-up. Sega added a throttle control, extended the game to 23 stages and adjusted parts of the gameplay while keeping the basic structure intact. The result became the better-known version.

A key Sega arcade game from Yu Suzuki’s era

After Burner II also sits inside an important period of Sega arcade development. Yu Suzuki was closely associated with Sega’s push towards fast, visually striking arcade games during the 1980s. His work included titles such as Hang-On, Space Harrier and Out Run, all of which focused heavily on movement, scaling and cabinet design. After Burner continued that approach, but shifted it into aerial combat.

Hiroshi Kawaguchi composed the arcade music, adding another recognisable Sega element to the package. The soundtrack mixes energetic rock-influenced tracks with the constant sound of engines, missiles and gunfire. It’s a noisy game, and deliberately so.

What the MiSTer core actually supports

The MiSTer implementation covers the X Board’s dual 68000 processors, Z80 audio CPU, sprite hardware, tilemaps, road generator, Yamaha YM2151 sound chip and PCM audio system. Several games have also been checked against MAME output during development, including frame comparisons used to spot visual differences.

Installation follows the standard MiSTer arcade setup. The core file goes into the arcade cores directory, while the MRA files sit in the main arcade folder. ROM files aren’t supplied, so users need to provide their own compatible game data.

The core also supports multiple regional and revision sets alongside the main nine games. One distinction is worth making. Sega’s later Y Board hardware isn’t part of this release. Games such as Galaxy Force II, Power Drift, G-LOC, Rail Chase and Strike Fighter used that separate platform.

For MiSTer owners, the real story is simple. This isn’t just about getting After Burner II running. It’s about adding an entire Sega arcade hardware family, with racing, shooting and action games all arriving together. After Burner II may be the headline name, but X Board had plenty more going on around it.

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