sprites!!!!!!

1 files changed, 19 insertions, 0 deletions

diff --git a/nes/dma.go b/nes/dma.go
new file mode 100644
index 0000000..ebdbcea
--- /dev/null
+++ b/nes/dma.go
@@ -0,0 +1,19 @@
+package nes
+
+// im too lazy to write an explanation so heres the nesdev page
+// https://www.nesdev.org/wiki/DMA#OAM_DMA
+func (n *Console) oamDMA(page uint8) {
+	base := uint16(page) << 8
+	for i := uint16(0); i < 256; i++ {
+		n.PPU.WriteRegister(0x2004, n.Read(base+i))
+	}
+	n.dmaPending = true
+}
+
+func (n *Console) dmaStallCycles() int {
+	stall := 513
+	if n.CPU.Cycles&1 == 1 {
+		stall++
+	}
+	return stall
+}