The Motorola M88k familiy of CPUs were the companys entry into the world of RISC CPUs. It was developed during the hey-days of the M68k CPU and intended to replace them while everybody was under the impression that RISC will replace CISC CPUs very soon.
Only two versions were created: The M88100 (20-25MHz) and the superscalar 88110 (40-50MHz). The further optimized 88120 (targeted 100MHz) never made it into production. Still, the bus-system made it into Motorolas final success – the PowerPC CPU.
Learn more about the M88k on Wikipedia or even better on badabada.org (Mirror of the original site). This page is mainly about the M88k hardware I own, that is the M8120 and (soon to come) some VME boards.