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The '''NAOMI''' ('''New Arcade Operation Machine Idea''') is an arcade system released by Sega in 1998. It was designed as a successor to [[Sega Model 3]] hardware, using a similar architecture to the [[Sega Dreamcast emulators|Sega Dreamcast]].

The NAOMI board and almost all of its variants were united in common by running on mostly the SH-4 32-bit RISC CPU. Next, all but two of these various boards shared their own form of the PowerVR 2 graphics processor with some differences in specifications (eg. either single or twin CPUs). The exception was the Cave CV1000 which ran on a Hitachi SH-3 CPU and its GPU was the Altera Cyclone EP1C12 FPGA. Many of them also utilized their own Yamaha audio chipset. Sega Hikaru had its own Sega Custom 3D GPU composed of dual PowerVR 2 GPU chips.

* Gaelco PowerVR Based (1999-2002) <ref group=N name=Gaelco>PowerVR 2-based board from [https://en.wikipedia.org/wiki/Gaelco Spanish company]. Not their early 'Gaelco 3D' board from 1996-1998. There is also an [https://github.com/aaronsgiles/Gaelco3D inactive emulator] for the unrelated earlier Gaelco 3D system, and [http://adb.arcadeitalia.net/dettaglio_mame.php?game_name=gaelco_serial&search_id=&lang=en MAME] [https://github.com/mamedev/mame/blob/master/src/mame/drivers/gaelco3d.cpp supports] that one.</ref>

* Sega NAOMI 2 (2001–2006) <ref group=N name=NAOMI2-Prototype>A prototype version of an unreleased game called ''Jet Squadron'' was made on the NAOMI 2 board in 2000 but the first officially released games started in 2001.</ref>

* Sega System SP (2004–2009) <ref group=N name=SystemSP_Aurora>Not really the same as SI Electronics' "Aurora", commonly mislabelled as "Sega Aurora".</ref>

* Cave CV1000B (2004–2007) <ref group=N name=Cave>The 'arcade_compat.txt' file inside DEmul's release archives do not have any Cave CV1000 emulation compat list, so its games' status is unknown.</ref>