Photo of Rockwell KIM-1 Rev D from early 1977 with bad Q1 transistor which prevents activation of the left-most LED. Click image for larger view.

Transistor Q1 has broken off, note the bare posts where Transistor Q1 should be. No biggie part on order. Rockwell put a plastic cover over the 6 individual LED displays, which is a good way to ID this as a MOS-manufactured OEM KIM-1. These boards may not have been sold bare to hobbyists. Instead they may have been sold by Rockwell to be embedded the heart of custom systems for industrial/business purposes, robots, projects, etc.. Click image for larger view.