1 files changed, 44 insertions, 0 deletions
diff --git a/mapper_0007.c b/mapper_0007.c
new file mode 100644
index 0000000..c1ad7fa
--- /dev/null
+++ b/mapper_0007.c
@@ -0,0 +1,44 @@
+static void mapper_0007_init(struct nes_state *state) {
+	state->map.m0007.prg_ptr = state->prg_rom;
+	state->map.m0007.mirroring = 0;
+}
+
+static uint8_t mapper_0007_prg_read(struct nes_state *state, uint32_t addr) {
+	if(addr >= 0x8000) {
+		return state->map.m0007.prg_ptr[addr - 0x8000];
+	}
+	return 0;
+}
+
+static void mapper_0007_prg_write(struct nes_state *state, uint32_t addr, uint8_t value) {
+	if(addr >= 0x8000) {
+		state->map.m0007.prg_ptr = state->prg_rom + ((value & 0x07) * 0x8000);
+		state->map.m0007.mirroring = (value & 0x10) ? 1 : 0;
+	}
+}
+
+static uint8_t mapper_0007_chr_read(struct nes_state *state, uint32_t addr) {
+	return state->chr_ram[addr];
+}
+
+static void mapper_0007_chr_write(struct nes_state *state, uint32_t addr, uint8_t value) {
+	state->chr_ram[addr] = value;
+}
+
+static uint8_t mapper_0007_ciram_read(struct nes_state *state, uint32_t addr) {
+	if(state->map.m0007.mirroring == 0) {
+		addr = (addr & 0x800) | (addr & 0x3ff);
+	} else {
+		addr = addr & 0x7ff;
+	}
+	return state->ciram[addr];
+}
+
+static void mapper_0007_ciram_write(struct nes_state *state, uint32_t addr, uint8_t value) {
+	if(state->map.m0007.mirroring == 0) {
+		addr = (addr & 0x800) | (addr & 0x3ff);
+	} else {
+		addr = addr & 0x7ff;
+	}
+	state->ciram[addr] = value;
+}