diff options
Diffstat (limited to 'src/interrupts.s')
| -rw-r--r-- | src/interrupts.s | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/src/interrupts.s b/src/interrupts.s new file mode 100644 index 0000000..be276df --- /dev/null +++ b/src/interrupts.s @@ -0,0 +1,37 @@ +.segment "FIXED" + +.proc nmi + pha + txa + pha + tya + pha + + ;; Sprite DMA. + lda #$00 + sta OAM::m_address + lda #$02 + sta OAM::m_dma + + ;; TODO + + ;; Always reset the scroll just in case. + bit PPU::m_status + lda #$00 + sta PPU::m_scroll + sta PPU::m_scroll + + ;; Restore registers. + pla + tay + pla + tax + pla + + rti +.endproc + +;; Unused. +.proc irq + rti +.endproc |