I had a color APC set up for AutoCAD 1.1 at one time. One of several that passed through my hands. They are a very nice machines, the color especially. There is a NEC hard drive (5 1/4" external) that worked with it. I had a hard drive and APC documentation until my warehouse cleanout. I don't think they were salvaged. If there is any software (CPM-86 and/or MS-DOS 2.11) for it the APC is a good candidate for a collection. Paxton