Two mode electronic cash register

Claim 1

An electronic cash register selectively operable in a one clerk mode or a two clerk mode comprising: first keyboard means for introducing data into said cash register; registration means for recording transaction data including unit cost information and commodity number information and for accumulating a transaction total amount, said registration means being responsive to said transaction data introduced by said first keyboard means; second keyboard means for introducing data into said cash register; calculation means for comparing data representative of the amount tendered by a customer with said transaction total amount received from said registration means and for determining the change to be given the customer, said calculation means selectively receiving said amount tendered data from either of said first or second keyboard means; timepiece means for developing current time information; set time memory means for storing preselected time data representative of the desired times for operating said cash register in the one clerk mode or the two clerk mode; detection means responsive to said timepiece means and said set time memory means for comparing the preselected time data with the current time information and developing a clerk mode signal to select said one clerk mode or said two clerk mode; and control means responsive to said clerk mode signal for disabling said second keyboard means when said one clerk mode is selected and for enabling said second keyboard means to provide said amount tendered data to said calculation means and inhibiting application of amount tendered data from said first keyboard means to said calculation means when said two clerk mode is selected.