Z80 Assembly 86: Calculating a Checksum or CRC
The Need for Data Integrity When data is transferred over an unreliable medium (like a cassette tape or a network connection), or when code is loaded from disk, electrical noise or corruption can change the data bytes. A Checksum or CRC provides a simple way to verify that the data received is exactly what was sent. Method 1: The Simple Checksum (The Fast Way) A simple checksum is the fastest method. It involves adding up every byte in the data block. ...