The MIT Lisp Machine has a fair bit of extra stuff in microcode other than the high level instruction set, it is at a slightly higher level than the Wildflower

The MIT Lisp Machine has a fair bit of extra stuff in microcode other than the high level instruction set, it is at a slightly higher level than the Wildflower microcode though as more was done in hardware. There are also some recent Freescale SoCs like the MPC5200 that use a programmable DMA engine to handle copying bytes between devices and memory.