2 files changed, 31 insertions, 0 deletions
diff --git a/mappers/mapper_003_2.c b/mappers/mapper_003_2.c
new file mode 100644
index 0000000..e93916a
--- /dev/null
+++ b/mappers/mapper_003_2.c
@@ -0,0 +1,27 @@
+
+static uint8_t mapper_003_2_prg_read(struct nes_state *state, uint32_t addr) {
+	return state->prg_rom[addr & 0x7fff];
+}
+
+static void mapper_003_2_prg_write(struct nes_state *state, uint32_t addr, uint8_t value) {
+	struct mapper_003_2 *mapper = (struct mapper_003_2 *)&state->map;
+
+	if(addr >= 0x8000) {
+		mapper->chr_ptr = state->chr_rom + (value & 3) * 0x2000;
+	}
+}
+
+static uint8_t mapper_003_2_chr_read(struct nes_state *state, uint32_t addr) {
+	struct mapper_003_2 *mapper = (struct mapper_003_2 *)&state->map;
+	return mapper->chr_ptr[addr];
+}
+
+static void mapper_003_2_init(struct nes_state *state) {
+	struct mapper_003_2 *mapper = (struct mapper_003_2 *)&state->map;
+
+	mapper->chr_ptr = state->chr_rom;
+
+	state->mapper.prg_read	= mapper_003_2_prg_read;
+	state->mapper.prg_write	= mapper_003_2_prg_write;
+	state->mapper.chr_read	= mapper_003_2_chr_read;
+}
diff --git a/mappers/mapper_003_2.h b/mappers/mapper_003_2.h
new file mode 100644
index 0000000..f15ac38
--- /dev/null
+++ b/mappers/mapper_003_2.h
@@ -0,0 +1,4 @@
+
+struct mapper_003_2 {
+	uint8_t *chr_ptr;
+} __attribute__((packed, aligned(64)));