CHK - Calculate Checksums ========================= CHK is a small program designed to calculate Files-11 block checksums. the format of a request to CHK is:- CHK Filespec/CK:blknum where Filespec is the specifier of the file containing the block whose checksum is to be calculated, and blknum is the number (in octal) of the block itself. The main use of CHK is to calulate File Header checksums when zapping fileheaders in [0,0]INDEXF.SYS, but it may be used anywhere the standard Files-11 checksum method is used.