74 lines
2.0 KiB
Python
74 lines
2.0 KiB
Python
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#!/usr/bin/env python3
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# Convert PDP-8 .rim format files to ILDEC .oct format
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# Created by Luxferre in 2026, released into the public domain
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import sys
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def print_error(msg):
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sys.stderr.write(f"Error: {msg}\n")
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def convert_rim_to_oct(input_path, output_path):
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# Initialize memory to 0
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memory = [0] * 4096
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try:
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with open(input_path, "rb") as f:
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raw_data = f.read()
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except Exception as e:
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print_error(f"Failed to read input file '{input_path}': {e}")
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return False
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# Filter out bytes with MSB set (bit 7)
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data = [b for b in raw_data if not (b & 0x80)]
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i = 0
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words_loaded = 0
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while i < len(data) - 1:
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word = ((data[i] & 0x3F) << 6) | (data[i+1] & 0x3F)
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if data[i] & 0x40 and i + 3 < len(data):
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addr = word
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val = ((data[i+2] & 0x3F) << 6) | (data[i+3] & 0x3F)
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memory[addr] = val
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words_loaded += 1
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i += 4
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else:
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i += 2
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# Output to .oct format
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try:
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with open(output_path, 'w') as f:
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for addr in range(4096):
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if memory[addr] != 0:
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f.write(f"{addr:04o}: {memory[addr]:04o}\n")
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except Exception as e:
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print_error(f"Failed to write output file: {e}")
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return False
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print(f"Successfully converted '{input_path}' to '{output_path}' ({words_loaded} words loaded).")
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return True
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def main():
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args = sys.argv if hasattr(sys, 'argv') else []
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if len(args) < 2 or len(args) > 3:
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print("Usage: python3 rim2oct.py <input_rim_file> [output_oct_file]")
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sys.exit(1)
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input_path = args[1]
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if len(args) == 3:
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output_path = args[2]
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else:
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# Generate default output name by replacing extension with .oct
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dot_idx = input_path.rfind('.')
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slash_idx = max(input_path.rfind('/'), input_path.rfind('\\'))
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if dot_idx > slash_idx:
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output_path = input_path[:dot_idx] + ".oct"
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else:
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output_path = input_path + ".oct"
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success = convert_rim_to_oct(input_path, output_path)
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if not success:
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sys.exit(1)
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if __name__ == '__main__':
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main()
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