This is a fork of Caro's DE1 OneChipMSX Port. The biggest change is that I have attempted to abstract the core away from the board-specific toplevel in order to make core easier to port to other boards. My initial target platforms are the DE1, Turbo Chameleon 64 and MIST boards, with DE2 to follow as time allows. Board-specific RTL, PLL and constraint files are in Board/<board>/*, while project files are found in fpga/<board>/* This fork contains an extra CPU (ZPUFlex), pulled in as a submodule, so having checked out the repo you'll also need to pull in the submodules with git submodule init git submodule update The extra CPU is used to load the BIOS from SD card at bootup, avoiding the problem of the core needing to be booted from an EPCS4 or compatible flash device. The other submodule is z80asm, which is used to build the InitialProgramLoader firmware if you make any changes to it.