add new mapper, 004_0 MMC3

1 files changed, 17 insertions, 0 deletions

diff --git a/mappers/mapper_004_0.h b/mappers/mapper_004_0.h
new file mode 100644
index 0000000..227d8b8
--- /dev/null
+++ b/mappers/mapper_004_0.h
@@ -0,0 +1,17 @@
+
+
+struct mapper_004_0 {
+	uint8_t *prg_banks[4];		// 8kb banks at $8000, $a000, $c000, $e000
+	uint8_t *chr_banks[8];		// 1kb banks at $0000-$1fff
+
+	uint8_t bank_select;
+	uint8_t bank_registers[8];
+	uint8_t mirroring;
+
+	uint8_t irq_latch;
+	uint8_t irq_counter;
+	uint8_t irq_reload;
+	uint8_t irq_enabled;
+
+	uint8_t last_a12;
+} __attribute__((packed, aligned(64)));