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| the check bit is used: |
the check bit is used to always produce an add number of 1 bits, That is the check bit will be 1. if the total number of 1 bits for representing a particular character is even. and it will be 0, otherwise. the tape shown in figure 8.2 uses the parity bit for an even parity. most modern magnetic tapes have 9 tracks. and they use the 8 bit EBCDIC code format for data recording as shown in Figure 8.3, in this case. the fourth track is used for parity bit. which produces an add parity in this example. notice that the letter a is represented here by the code 1100000, as in the 8 bit EBCDIC code format.