The NEC PC-6600 Series were a lineup of personal computers produced by the

NEC Corporation is a Japanese multinational information technology and electronics corporation, headquartered in Minato, Tokyo. The company was known as the Nippon Electric Company, Limited, before rebranding in 1983 as NEC. It provides IT and network soluti ...

in 1985. They were essentially a PC-6001 MK2 with a built-in 3.5"

floppy disk A floppy disk or floppy diskette (casually referred to as a floppy, or a diskette) is an obsolescent type of disk storage composed of a thin and flexible disk of a magnetic storage medium in a square or nearly square plastic enclosure lined w ...

drive. Two models in this series were produced: the PC-6601 and the PC-6601 SR.

References

OLD-COMPUTERS.COM: The Museum: NEC PC 6601
PC-6601 Computer-related introductions in 1985 Z80-based home computers {{compu-stub