Passing Tests

blargg/cpu_instrs.gb
blargg/instr_timing.gb
blargg/mem_timing.gb
mts/acceptance/ppu/intr_1_2_timing-GS.gb (VBlank intr -> OAM intr timing)
mts/acceptance/ppu/intr_2_0_timing.gb (VBlank intr -> HBlank intr timing) (I think this shouldn't pass, i believe i'm triggering the HBlank IRQ one CPU cycle late)
mts/acceptance/ppu/stat_lyc_onoff.gb (LY==LYC handling with PPU being enabled and disabled)
mts/acceptance/ppu/stat_irq_blocking.gb (LCD status IRQ blocking)