added more mappers (buggy)

1 files changed, 28 insertions, 0 deletions

diff --git a/mapper_2002.c b/mapper_2002.c
new file mode 100644
index 0000000..700a24b
--- /dev/null
+++ b/mapper_2002.c
@@ -0,0 +1,28 @@
+
+static void mapper_2002_init(struct nes_state *state) {
+	state->map.m2002.prg_bank0 = state->prg_rom; // default to bank 0
+	state->map.m2002.prg_bank1 = state->prg_rom + state->ines.prg_size - 0x4000;
+}
+
+static uint8_t mapper_2002_prg_read(struct nes_state *state, uint32_t addr) {
+	if(addr >= 0x8000 && addr < 0xc000) {
+		return state->map.m2002.prg_bank0[addr & 0x3fff];
+	} else if(addr >= 0xc000) {
+		return state->map.m2002.prg_bank1[addr & 0x3fff];
+	}
+	return 0;
+}
+
+static void mapper_2002_prg_write(struct nes_state *state, uint32_t addr, uint8_t value) {
+	if(addr >= 0x8000) {
+		state->map.m2002.prg_bank0 = state->prg_rom + ((value & 0x0f) * 0x4000);
+	}
+}
+
+static uint8_t mapper_2002_chr_read(struct nes_state *state, uint32_t addr) {
+	return state->chr_ram[addr];
+}
+
+static void mapper_2002_chr_write(struct nes_state *state, uint32_t addr, uint8_t value) {
+	state->chr_ram[addr] = value;
+}