From Sega Retro
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The PC-6000 series (PC-6000シリーズ) is a range of Japanese home computers manufactured between November 1981 and 198x by NEC.
Sega did not develop and publish for the PC-6000 series directly, however a single port of Space Harrier was published for the platform by Dempa. In the interests of simplicity, Sega Retro is treating all revisions of the hardware as one platform - for more in-depth coverage, see NEC Retro's coverage of the platform.
List of Sega games for the PC-6000 series
Other PC-6000 series games also released for Sega systems
NEC Retro has more information related to PC-6000 series