amw-zero/6502-rs — pull request #13 by akeeton (2014-10-17 02:21:09+00:00)
Title: Implement the BMI instruction

From http://www.obelisk.demon.co.uk/6502/reference.html#BMI:
> BMI - Branch if Minus
>
> If the negative flag is set then add the relative displacement to the program counter to cause a branch to a new location.