I’ve added the NVC custom commands, mpyhw, rev, xh, xb, to the opcode table in the binutils patch so they can be used by the assembler. I’ve also renamed the enable/disable interrupt instructions from ei/di to cli/sei (not very intuitive, but it’s what they’re called in the manual), and fixed the typos Mednafen spotted.
Still to do is write instruction patterns for the machine description/compiler.
BTW, does anyone know if any of the released games actually use any of the custom commands or bitstring instructions?