To properly read and write to the memory bank, the clock input must be viewed as an analog input. There are three states the clock input can be in. The first state is ‘8’hex and higher. The second is from ‘1’hex through ‘7’hex. The third is at ‘0’hex. If there is no connection to the rear of the bank then the second and third state are equivalent. State 1 may be called ‘read’, state 2 called ‘write’ and the third may be just be called the ‘0’ state. Changes TO the ‘0’ state make no change in the bank, however they may be necessary for proper operation.
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