[[https://www.fpga4fun.com/|FPGA For Fun]]

[[http://web.archive.org/web/20130703140922/http://www.fpgaarcade.com/library.htm]]

[[https://web.archive.org/web/20220409185633/https://www.ics.uci.edu/~jmoorkan/vhdlref/vhdl.html]]