The Macintosh IIcx was introduced in 1989 and sold for two years. It was similar to the IIx though in a smaller and easy to open case which was also used by the more powerful Macintosh IIci which succeeded it. The IIcx came with a Motorola 68030 running at 16Mhz and could support up to 128MB of RAM (though that would have cost the GDP of a small country back then).
The IIcx ran Mac OS 6 up to 7.5.5. Unfortunately this one is unlikely to run anything anymore though still has the cute case!