if (AltosConvert.checksum(chunk.data, start, record_length) != 0)
throw new ParseException(String.format("invalid checksum at 0x%x",
chunk.address + start), 0);
if (AltosConvert.checksum(chunk.data, start, record_length) != 0)
throw new ParseException(String.format("invalid checksum at 0x%x",
chunk.address + start), 0);