tmerritt
25423d3828
Baseball Clu Clu Land Excitebike Pac-Man (Namco) Tennis Balloon Fight Bomberman (U) Burger Time (U) Defender 2 (U)
51 lines
1.2 KiB
Python
51 lines
1.2 KiB
Python
#!/usr/bin/env python3
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import sys
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from pathlib import Path
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def split_nes_rom(filename):
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data = Path(filename).read_bytes()
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if len(data) < 16:
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raise ValueError("File is too small to be a valid NES ROM.")
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header = data[:16]
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if header[0:4] != b"NES\x1A":
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raise ValueError("Invalid iNES header.")
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prg_banks = header[4]
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chr_banks = header[5]
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prg_size = prg_banks * 16384 # 16 KB per bank
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chr_size = chr_banks * 8192 # 8 KB per bank
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print(f"PRG Banks : {prg_banks}")
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print(f"CHR Banks : {chr_banks}")
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print(f"PRG Size : {prg_size} bytes")
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print(f"CHR Size : {chr_size} bytes")
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prg_start = 16
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prg_end = prg_start + prg_size
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chr_start = prg_end
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chr_end = chr_start + chr_size
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prg = data[prg_start:prg_end]
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chr = data[chr_start:chr_end]
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Path("header.bin").write_bytes(header)
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Path("prg.bin").write_bytes(prg)
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Path("chr.bin").write_bytes(chr)
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print("Created:")
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print(" header.bin")
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print(" prg.bin")
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print(" chr.bin")
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if __name__ == "__main__":
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if len(sys.argv) != 2:
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print(f"Usage: {sys.argv[0]} rom.nes")
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sys.exit(1)
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split_nes_rom(sys.argv[1]) |