This is a PCB for an FPGA-based retrocomputer based on the original designs by Grant Searle
see: https://www.retrobrewcomputers.org/doku.php?id=boards:sbc:multicomp:cycloneii-c:start
and: https://github.com/nealcrook/multicomp6809
Grant's original design is here: http://searle.hostei.com/grant/Multicomp/index.html