From da9d961bbc3662064599f4b0b4759a2c641924a2 Mon Sep 17 00:00:00 2001 From: Peter Fors Date: Sat, 3 May 2025 01:00:44 +0200 Subject: forgot the renamed mappers --- mappers/mapper_003_2.c | 27 +++++++++++++++++++++++++++ mappers/mapper_003_2.h | 4 ++++ 2 files changed, 31 insertions(+) create mode 100644 mappers/mapper_003_2.c create mode 100644 mappers/mapper_003_2.h diff --git a/mappers/mapper_003_2.c b/mappers/mapper_003_2.c new file mode 100644 index 0000000..e93916a --- /dev/null +++ b/mappers/mapper_003_2.c @@ -0,0 +1,27 @@ + +static uint8_t mapper_003_2_prg_read(struct nes_state *state, uint32_t addr) { + return state->prg_rom[addr & 0x7fff]; +} + +static void mapper_003_2_prg_write(struct nes_state *state, uint32_t addr, uint8_t value) { + struct mapper_003_2 *mapper = (struct mapper_003_2 *)&state->map; + + if(addr >= 0x8000) { + mapper->chr_ptr = state->chr_rom + (value & 3) * 0x2000; + } +} + +static uint8_t mapper_003_2_chr_read(struct nes_state *state, uint32_t addr) { + struct mapper_003_2 *mapper = (struct mapper_003_2 *)&state->map; + return mapper->chr_ptr[addr]; +} + +static void mapper_003_2_init(struct nes_state *state) { + struct mapper_003_2 *mapper = (struct mapper_003_2 *)&state->map; + + mapper->chr_ptr = state->chr_rom; + + state->mapper.prg_read = mapper_003_2_prg_read; + state->mapper.prg_write = mapper_003_2_prg_write; + state->mapper.chr_read = mapper_003_2_chr_read; +} diff --git a/mappers/mapper_003_2.h b/mappers/mapper_003_2.h new file mode 100644 index 0000000..f15ac38 --- /dev/null +++ b/mappers/mapper_003_2.h @@ -0,0 +1,4 @@ + +struct mapper_003_2 { + uint8_t *chr_ptr; +} __attribute__((packed, aligned(64))); -- cgit v1.2.3