 Error-Correcting & Error-Checking Codes
The world was made a faster and safer place to be because of error-checking and error-correcting codes. A Reference by by Jason Downing & Jeffrey Nevinski.
IBM Bisync Block Checking Procedures
In this method, both a Vertical Redundancy Check (character parity) and a Longitudinal Redundancy Check (block parity or horizontal parity) are performed. The VRC bit provides odd-parity for each character. The LRC provides odd-parity of each bit position of all characters in the block.
Principles of Computer Architecture Chapter 9: Communication (PDF)
1999 M. Murdocca and V. Heuring. LRC and VRC Checking. Combined LRC and VRC checking.
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