I downloaded the ROMs and the Nexys4DDR bitstream and put them on an SD card, but when I turn on, the 8 digit displays start at "4000 0000", then drop to "0100 0000", the busy light flashes like mad, and the display is a scrolling mess of green patterns that change every second.
If I flick switch 7 I can get a solid colour image (usually blue, but sometimes pink).
It's been a while since I tested a M65 core (and that was before the Open Roms project), so it'll probably be the case that I've set the SD card up wrong.
The bitstream file I was using was "nexys4ddr-widget-20200624.00-HEAD_n-4a8842d+DIRTY.bit" from the "stable_base/18-4a8842d" folder and the roms from "36-b725711"
Any ideas what I'm doing wrong?