Took some liberties with the ISA naming, including defining NOP to be POPk (convenient for padding when hand-assembling), but got my #uxn implementation passing unit tests for every opcode! I'm sure there's sharp edges, but they'll have to wait until I get some devices wired up and come up with some sort of test assembler format. https://git.arrdem.com/arrdem/uxn/src/branch/trunk/tests/vm_tests.rs

Hopefully I'll have VGA wired up here in a bit...