I have a working APC III and color monitor, fully decked out. It has the 8087 option and the SLE board, which stands for Software Library Expander, giving it essentially full IBM compatibility. I haven''t tested it, but the hard drive has/had Jeopardy loaded, and it seemed to run fine. Ok not MS Flight Simulator or Lotus 1-2-3 (IBM version), which were designated compatibility litmus tests back in the day, but I assume it''s pretty compatible. I''d have to pull it out and dust it off and mess with it some. I doubt the h/d will boot anymore, but I have all the necessary s/w images, including those necessary to activate the SLE subsystem.
From the looks of it, the III is the American market version of the PC-9801, or very similar at least. Has the same cards/card cage in the back. C-Bus? A 9801 would be very very cool to have, Japanese to the hilt, but I''m still proud of my APC III.

I used both the original APC and the APCIII. They were cutting edge computers at the time. My father was IS Director for NEC Technologies at the time so I got to play with most of the new NEC products, including some of their home audio gear. I really liked the APC with the two 1MB floppies and 10MB hard drive. Moonball was great on that having the color screen. My dad used it for doing letters (stuffing envelopes) for an organization outside Boston and the machine would keep me up at night as both floppies were very noisy when being accessed for the mail merge (can''t remember what the word processing program was". But it would be going all night long processing the letters and then printing them out on the NEC Spinwriter, a letter quality printer at the time. It''s funny how looking back on those days how amazing they seemed.. even compared to today with all the technology. I guess it was my age and the newness of computers, but there was something special about messing around with these computers. I''ve been in and out of IT for 35 years now (and my dad a lot longer) and these old computers have a special place in my heart.

I used an APC III back in 82/83. It booted in BASIC direct if no floppy was $ed. The floppy drive was an accessory that came later and a wonder to me! Before that I had to type the program I needed to run line by line every time it was turned on again! With floppies also came the possibility to boot in other operating systems. I used CP/M and the fantastic programs DR-Draw and DR-Graph. Also Wordperfect! Miss those days!