On 24 Aug 2010 at 14:24, Michael Lee wrote: This is an early member (coming out of NEC's Business Products Group) of the PC98 series, circa 1982. Superb 7220-generated graphics, you could get the displays as monochrome or color. Otherwise known (in Japan) as the N5200. Not at all IBM-PC compatible, again, based on the NEC PC98 standard that at one time had most of the Japanese PC market. Well-built, but closed architecture (the expansion is based on the "C-bus"). CP/M-86 and MS-DOS are both available (I have disks for both). The disk format is basically 8 sectors of 1024 bytes on 2 sides of 77 tracks. This same format was repeated in 5.25" and 3.5" formats; that is, the format doesn't change with the physical media size. The 3.5" drives spin at 360 RPM, the same as the 5.25" and 8" ones. You'll sometimes see the version of MS-DOS for the PC98 systems referred to as "DOS-V". Can't help you with the keyboard, however. --Chuck