NEC · 1982 – 2000
The NEC PC-9801 was Japan's dominant personal computer platform for nearly two decades, running a proprietary DOS-compatible operating system. It was the development platform and primary market for classic Japanese games including the original Ys, Dragon Slayer, and early Touhou Project titles.
NEC introduced the PC-9801 in 1982 as a business computer running a modified MS-DOS (called PC-DOS) on an Intel 8086 processor. The hardware became Japan's dominant personal computer architecture, maintaining over 50% market share through the late 1980s and early 1990s against IBM PC-compatible competition. The platform's dominance was sustained by Japanese-language software support and the ecosystem of software, including games, that had been developed specifically for its architecture. The PC-9801's graphics capabilities — initially 640×400 at 8 colours, later expanded with 16-colour and eventually 256-colour modes — were superior to contemporary IBM PC CGA but required software written specifically for the platform's hardware rather than IBM PC standards. This created a parallel game development ecosystem entirely distinct from Western PC gaming: Nihon Falcom's Dragon Slayer series and Ys games, Hideo Kojima's Snatcher and Policenauts, and the earliest Touhou Project entries were all PC-9801 exclusives before being ported to other platforms or remaining Japan-only. The FM sound capabilities of later PC-9801 hardware — typically through optional FM sound boards using Yamaha OPL or OPN chips — enabled game music of quality comparable to dedicated game hardware. Yuzo Koshiro's Ys soundtracks, composed for PC-88 and PC-98 FM hardware before being adapted for consoles, represented the peak of Japanese home computer game music. The PC-9801's architecture was replaced by IBM PC-compatible hardware in Japan during the mid-1990s as PC/AT-compatible machines achieved sufficient Japanese-language software support to displace the proprietary platform.