CRC32 is an error checking program. When run, the program will ask for the name of a file. It will scan the file and report the "CCITT CRC-32" value. When transferring a program over a modem or with a copy program, you can run this program on that file before and after to make sure you got a 100% identical copy. Docs are on the disk. This program will work both on a c64 and c128.