From 39715ca6bf65d2e2dd889cdef4b39d584464d9e7 Mon Sep 17 00:00:00 2001 From: Peter Fors Date: Sun, 6 Apr 2025 12:27:12 +0200 Subject: added more mappers (buggy) --- mapper_0003.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) create mode 100644 mapper_0003.c (limited to 'mapper_0003.c') diff --git a/mapper_0003.c b/mapper_0003.c new file mode 100644 index 0000000..743df51 --- /dev/null +++ b/mapper_0003.c @@ -0,0 +1,25 @@ + + +static void mapper_0003_init(struct nes_state *state) { + state->map.m0003.chr_ptr = state->chr_rom; +} + +static uint8_t mapper_0003_prg_read(struct nes_state *state, uint32_t addr) { + if(addr >= 0x8000) { + return state->prg_rom[addr - 0x8000]; + } + return 0; +} + +static void mapper_0003_prg_write(struct nes_state *state, uint32_t addr, uint8_t value) { + if(addr >= 0x8000) { + state->map.m0003.chr_ptr = state->chr_rom + (value & 3) * 0x2000; + } +} + +static uint8_t mapper_0003_chr_read(struct nes_state *state, uint32_t addr) { + return state->map.m0003.chr_ptr[addr]; +} + +static void mapper_0003_chr_write(struct nes_state *state, uint32_t addr, uint8_t value) { +} -- cgit v1.2.3