1 files changed, 25 insertions, 0 deletions
diff --git a/mapper_0003.c b/mapper_0003.c
new file mode 100644
index 0000000..743df51
--- /dev/null
+++ b/mapper_0003.c
@@ -0,0 +1,25 @@
+
+
+static void mapper_0003_init(struct nes_state *state) {
+	state->map.m0003.chr_ptr = state->chr_rom;
+}
+
+static uint8_t mapper_0003_prg_read(struct nes_state *state, uint32_t addr) {
+	if(addr >= 0x8000) {
+		return state->prg_rom[addr - 0x8000];
+	}
+	return 0;
+}
+
+static void mapper_0003_prg_write(struct nes_state *state, uint32_t addr, uint8_t value) {
+	if(addr >= 0x8000) {
+		state->map.m0003.chr_ptr = state->chr_rom + (value & 3) * 0x2000;
+	}
+}
+
+static uint8_t mapper_0003_chr_read(struct nes_state *state, uint32_t addr) {
+	return state->map.m0003.chr_ptr[addr];
+}
+
+static void mapper_0003_chr_write(struct nes_state *state, uint32_t addr, uint8_t value) {
+}