Namco NA-1

The Namco NA-1 is a 16-bit arcade system board which was first used by Namco in July 1992, and was the successor to the Namco System 1 and 2 system board; the company's first quiz game, Bakuretsu Quiz Ma-Q Dai Bōken, was the first game to use it. Three months later, they released F/A (which was later renamed, to Fighter & Attacker, for the United States) - and this was followed by Cosmo Gang the Puzzle in November (which became an inspiration for Pac-Attack) Exvania in December (which is one of only two Japan-exclusive games from them with an FBI "Winners Don't Use Drugs" screen) and Super World Court in December (a sequel to Pro Tennis: World Court, which had five Pac-Mans playing the part of ball boys on its "Namco" court, and the players could send the two on the sides flying through the air!). The following year, they released Emeraldia and Tinkle Pit; the Namco NA-2 is also backwards compatible with the NA-1. It is not yet known what extra features the NA-2 has apart from different MCU code - and the first game to run on it was Knuckle Heads, released in its initial year. The following year, they released an NA-2 version of Emeraldia, Net-tō! Geki-tō! Quiz-tō!!, and Numan Athletics; two years after that they released X-Day 2 (the sequel to X-Day, so this means that they did not release any games on either the NA-1 or NA-2 arcade system boards in 1994, which is an unusual occurrence).

Nikonov NA-2 and NA-4

The NA-2 and NA-4 were two early factory prototypes of bullpup assault rifles, created by Gennadiy Nikonov during the development of AN-94. Although they used a similar mechanism with the later prototypes of Nikonov AS and ASM, the NA series differed in that they were of bullpup configuration, which was later abandoned by Nikonov starting with the first AS prototype.

The pistol grip of NA-2 and NA-4 is rather unusual even for this type of design. It is angled forward rather than backward, forcing the shooter to lean significantly into the gun; it was also located very close to the magazine. As with the early prototypes of AN-94, these guns could fire a three-round burst at 1,800 rpm before switching to a lower cyclic rate of 600 rpm. (The 1,800 rpm cycle was reduced to just two rounds later in the development of the AS-series prototypes.)

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