Macintosh IIci (1989)

The Apple Macintosh IIci was an improvement on the Macintosh IIcx. Sharing the same compact case design with three expansion slots, the IIci improved upon the IIcx's 16 MHz Motorola 68030 CPU and 68882 FPU, replacing them with 25 MHz versions of these chips. The IIci came with either a 40 or an 80 megabyte hard disk. A logic board upgrade was available for IIcx owners. The Quadra 700's case uses the same form factor, and a logic board upgrade was made available for both the IIcx and IIci upon the Quadra's introduction in 1990. The IIci introduced a lot of technical and architectural enhancements, some of which were important in preparing for System 7 (which was then called the Blue project) and would influence future Macs, though some of them came at the cost of compatibility.

via Wikipedia: http://en.wikipedia.org/wiki/Macintosh_IIci