The Free On-line Dictionary of Computing (30 December 2018):

Macintosh IIcx
Mac IIcx

    (Mac IIcx) A version of Apple's Macintosh II
   personal computer, introduced in 1989, with a Motorola
   68030 processor running at 16 MHz and up to 128 MB of RAM
   (120 ns, 30-pin DRAM chips).  The IIcx requires System 6.0.3
   or later and requires "Mode 32" or "32-bit Enabler" to use
   more than 8MB of RAM.  It was discontinued 1991, and in 1996
   is still considered one of the best-designed Macs ever.

   (1996-05-25)