Issue #32.  Set B bit based on irq_sel, which should be BRK unless there is an actual HW interrupt being serviced.
Issue #32.  Set B bit based on irq_sel, which should be BRK unless there is an actual HW interrupt being serviced.

gtaylormb/fpga_nes,gtaylormb/fpga_nes,brianbennett/fpga_nes,timofonic/fpga_nes,gtaylormb/fpga_nes,brianbennett/fpga_nes,brianbennett/fpga_nes,timofonic/fpga_nes,timofonic/fpga_nes