"The NEC PC-6001 was the first of the NEC Corporation personal computer line. There were several versions of the PC-6001, including the PC-6001 MK2, the PC-6001 MK2 SR, and the PC-6801. There was also an American version, called the NEC TREK, or NEC PC-6001A. It was followed by the NEC PC-6601.
Several peripherals were available for the system in North America, including an expander with three cartridge jacks (some of the cartridge-based games used two cartridges), a cassette-tape recorder, a 5.5" floppy disc drive, a printer, and a touch pad." (Wikipedia)
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NEC PC-6001 - BIOS (TOSEC-v2006-05-06)
NEC PC-6001 - Demos (TOSEC-v2005-09-12)
NEC PC-6001 - Games (TOSEC-v2007-01-08)