File:Motorola MC68881RC16B math coprocessor.jpg

A 16MHz PGA version of a Motorola 68881 floating-point unit (FPU), designed for use with a Motorola 68020, such as the one in the Macintosh II.

Source

 * File:Motorola 68881.jpg by Dirk Oppelt / Morkork~commonswiki, Wikimedia Commons. 2006-01-16.