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Sega System 1 was a type of arcade hardware used in various Sega arcade machines from 1983 until 1987. For most of its run it coexisted with Sega System 2 (1985–1988) and as a result had many similar features (the only major difference being that System 2 had two separate circuit boards instead of one). In its four year span it was used in some 20 different arcade games including Choplifter, Flicky, Pitfall II: Lost Caverns, and Wonder Boy.
In order to prevent piracy, as well as illegal bootleg games, many System 16 boards used an encryption system. A Hitachi FD1094 chip, containing the main CPU as well as the decryption key, was used in place of a regular CPU.
The System 16's pairing of a Motorola 68000 CPU and a Zilog Z80 coprocessor would prove to be a popular and durable arcade hardware configuration well into the 1990s. Capcom's CPS-1 and CPS-2 boards were built on a similar foundation, as was SNK's Neo Geo hardware. Sega would later use the 68000/Z80 combination to power its Genesis/Mega Drive home console.

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The Sega X Board is an arcade system board released by Sega in 1987. It was noteworthy for its sprite manipulation capabilities, which allowed it to create high quality pseudo-3D visuals. This trend would continue with the Y Board and the System 32, before the Model 1 made true 3D arcade games more financially affordable.

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The Sega Y Board is an arcade system board released by Sega in 1988. Just like the X Board before it, the Y Board was known for its sprite manipulation capabilities.
The Sega System 18 is an arcade system board released by Sega in 1989. System 18 had a very short run of games but most boards on this hardware were JAMMA standard. Most of these games also have the "suicide battery" as associated with Sega's System 16 hardware.

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The Sega System 24 was an arcade system board released by Sega in 1988. It was produced for coin-operated video arcade machines until 1996. Some games released using this hardware include: Bonanza Bros., Hot Rod, and Gain Ground. The System 24 used two Motorola 68000 processors at 10 MHz. One was for booting, while the other was used by the game. The board holds 1360 kB of RAM and 256 kB of ROM. It was the first Sega arcade system that required a medium resolution arcade monitor. The color palette was 4352 selectable from 32 768. The system could support up to 2048 sprites on-screen at once. Sound was driven by a YM2151 at 4 MHz; it was capable of delivering 8 channels of FM sound in addition to a DAC used for sound effects and speech synthesis. Early System 24s loaded their program from floppy disks. Later, some games such as Bonanza Bros. used CD-ROMs or hardware ROM boards to store games. No matter which storage device was used, a special security chip was required for each game an operator wanted to play.