Añadidos scripts python

fix_checksum.py

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+import sys
+import os
+
+# Parámetros equivalentes
+desp = 0x2000
+numBytes = 0x2000
+firstByte = desp + 0x200
+lastByte = desp + numBytes - 1
+checksum1 = desp + 0x270
+checksum2 = desp + 0x271
+
+buffer = bytearray()
+
+
+def check_parameters():
+    if len(sys.argv) != 2:
+        exe = os.path.basename(sys.argv[0])
+        print(f"Uso: {exe} FILE")
+        sys.exit(1)
+    return sys.argv[1]
+
+
+def load_file(path):
+    global buffer
+    try:
+        with open(path, "rb") as f:
+            buffer = bytearray(f.read())
+    except IOError:
+        print(f"No se puede abrir el archivo: {path}")
+        sys.exit(1)
+
+
+def save_file(path):
+    try:
+        with open(path, "wb") as f:
+            f.write(buffer)
+        print(f"Fichero guardado: {path}")
+    except IOError:
+        print(f"No se puede abrir el archivo: {path}")
+        sys.exit(1)
+
+
+def calc_checksum():
+    total = 0
+    for i in range(firstByte, lastByte + 1):
+        if i not in (checksum1, checksum2):
+            total += buffer[i]
+
+    total += 3328  # Corrección del checksum
+
+    buffer[checksum1] = total % 256
+    buffer[checksum2] = (total >> 8) % 256
+
+    return total
+
+
+def main():
+    filePath = check_parameters()
+    load_file(filePath)
+    save_file(filePath + ".bak")
+    calc_checksum()
+    save_file(filePath)
+
+
+if __name__ == "__main__":
+    main()