1 files changed, 53 insertions, 0 deletions
diff --git a/mappers/mapper_007_2.c b/mappers/mapper_007_2.c
new file mode 100644
index 0000000..ed56dd0
--- /dev/null
+++ b/mappers/mapper_007_2.c
@@ -0,0 +1,53 @@
+
+
+static uint8_t mapper_007_2_prg_read(struct nes_state *state, uint32_t addr) {
+	struct mapper_007_2 *mapper = (struct mapper_007_2 *)&state->map;
+	if(addr >= 0x8000) {
+		return mapper->prg_rom[addr & 0x7fff];
+	}
+	return 0;
+}
+
+static void mapper_007_2_prg_write(struct nes_state *state, uint32_t addr, uint8_t value) {
+	struct mapper_007_2 *mapper = (struct mapper_007_2 *)&state->map;
+	if(addr >= 0x8000) {
+		uint32_t prg_off = (value & 0x0f) << 15;
+		uint32_t ciram_off = (value & 0x10) << 11;
+		mapper->prg_rom = state->prg_rom + prg_off;
+		mapper->ciram = state->ciram + ciram_off;
+
+		// mapper->prg_rom = state->prg_rom + ((value & 0x0f) * 0x8000);
+		// mapper->ciram = state->ciram + ((value & 0x10) ? 0x400 : 0x000);
+	}
+}
+
+static uint8_t mapper_007_2_chr_read(struct nes_state *state, uint32_t addr) {
+	return state->chr_ram[addr];
+}
+
+static void mapper_007_2_chr_write(struct nes_state *state, uint32_t addr, uint8_t value) {
+	state->chr_ram[addr] = value;
+}
+
+static uint8_t mapper_007_2_ciram_read(struct nes_state *state, uint32_t addr) {
+	struct mapper_007_2 *mapper = (struct mapper_007_2 *)&state->map;
+	return mapper->ciram[addr & 0x3ff];
+}
+
+static void mapper_007_2_ciram_write(struct nes_state *state, uint32_t addr, uint8_t value) {
+	struct mapper_007_2 *mapper = (struct mapper_007_2 *)&state->map;
+	mapper->ciram[addr & 0x3ff] = value;
+}
+
+static void mapper_007_2_init(struct nes_state *state) {
+	struct mapper_007_2 *mapper = (struct mapper_007_2 *)&state->map;
+	mapper->prg_rom = state->prg_rom;
+	mapper->ciram = 0;
+
+	state->mapper.prg_read		= mapper_007_2_prg_read;
+	state->mapper.prg_write		= mapper_007_2_prg_write;
+	state->mapper.chr_read		= mapper_007_2_chr_read;
+	state->mapper.chr_write		= mapper_007_2_chr_write;
+	state->mapper.ciram_read	= mapper_007_2_ciram_read;
+	state->mapper.ciram_write	= mapper_007_2_ciram_write;
+}