Analysis of information sources in references of the Wikipedia article "Intel i960" in English language version.
The original i960 chips (KA/KB/MC/XA) have a large number of pins that are not connected (marked NC on the datasheet) [...] checking the datasheets shows that all four chips have the same pinout; there are no pins connected only in the more advanced versions. Second, looking at the packaged chip (below) explains why so many pins are unconnected: much of the chip has no bond pads, so there is nothing to connect the pins to.