Error checking apparatus for recording data on a record medium

Claim 1

IN A TAPE CONTROL SYSTEM OPERATIVELY ASSOCIATED WITH DATA PROCESSING APPARATUS WHERE DATA CONTAINED IN SAID APPARATUS IS CAUSED TO BE WRITTEN ON TAPE IN RESPONSE TO A SIGNAL FROM SAID DATA PROCESSING APPARATUS, SAID DATA BEING WRITTEN ON SAID TAPE IN ADJACENT COLUMNS, EACH OF SAID COLUMNS COMPRISING A GIVEN AMOUNT OF BINARY BITS, A PRESCRIBED AMOUNT OF COLUMNS COMPRISING A WORD WHEREBY EACH OF THE CORRESPONDING BITS OF THE COLUMNS FORM A ROW; MEANS FOR WRITING DATA ON TAPE, APPARATUS FOR PROVIDING A ROW PARITY CHECK FOR EACH WORD AND A COLUMN PARITY CHECK FOR EACH COLUMN COMPRISING MEANS FOR EFFECTING THE READING OF DATA FROM THE TAPE SUBSTANTIALLY CONCURRENTLY WITH THE WRITING THEREOF, TIMING MEANS RESPONSIVE TO THE SIGNALS DETECTED WHEN SAID DATA IS READ FOR INITIATING A TIMING CYCLE IN ACCORDANCE WITH A CHOSEN TIME SEQUENCE, MEANS RESPONSIVE TO THE APPLICATION THERETO OF SAID DETECTED SIGNALS AND CONTROLLED BY SAID TIMING MEANS FOR INDICATING AT A FIRST SELECTED TIME ROW PARITY INFORMATION AND FOR INDICATING AT A SECOND SELECTED TIME COLUMN PARITY INFORMATION.