From NEC Retro
The PC-9800 series (PC-9800シリーズ) is a range of computers manufactured between October 1982 and 1995 by NEC.
Starting with the PC-9801, the PC-9800 series became one of the dominant brands of home computers in Japan throughout the 1980s and into the 1990s. It was one of the second "big three", competing against the Sharp X68000 and FM Towns. The PC-98 was the best-selling home computer series in Japan up until 1999, when it had sold more than 18 million units in Japan.
For information, see PC-9800 series.