I've waited to open the project up until the last minute.  I wanted to get boards in hand before going public, but I want to submit to this year's retrocomputer challenge.

I wanted to verify the timing and logic of the design in VHDL before I started with chips.  It's much easier to make design changes with a few lines of code than rewiring solderless breadboards.  I can load the ROM as a memory initialization file.  I made the top-level VHDL code structural to represent the schematic for the board.  I wanted each PLD a module with only its equations inside.  Some registers are just processes, but that's ok.  The Basys3 is an easy board for this since it has a VGA output and plenty of LEDs/buttons to simulate functions.  It has a USB port to simulate a PS/2 keyboard or mouse.

Everything is fully operational on the FPGA.  Software development can continue on the FPGA for the library and demos/benchmarks.  It should perform the same as the board.

Of course, the end goal is getting a board made.  So I have the KiCad main board and cartridge schematics finished.  The board is 95% routed, so I should be ordering boards any day now.