https://hackaday.io/project/172073-microcoding-for-fpgas
Simple system built around VHDL implementation of Am9080 8-bit CPU based on 29XX bit-slice series of devices, as described here: https://en.wikichip.org/w/images/7/76/An_Emulation_of_the_Am9080A.pdf
Spin object to drive Am9511 vintage floating point co-processor, plus test / demo / sample object