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An electronic cash register is provided which comprises a keyboard including a plurality of entry keys, function keys and department keys, a memory, a first interface circuit with which a cashier memory pack is mechanically, electrically and disconnectably coupled, a second interface circuit with wh

An electronic cash register is provided which comprises a keyboard including a plurality of entry keys, function keys and department keys, a memory, a first interface circuit with which a cashier memory pack is mechanically, electrically and disconnectably coupled, a second interface circuit with which a terminal memory pack is mechanically, electrically and disconnectably coupled, and a central processing unit connected to the keyboard, the memory, and the first and second interface circuits in which the sales information generated upon depression of the entry keys, the function keys and department keys are loaded into the memory and at least the sales total for a customer in the sales information is loaded for each transaction into the cashier memory pack and the terminal memory pack.

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An electronic cash register comprising: a keyboard having a plurality of entry keys and at least one function key; memory means; a cashier memory pack; a first interface circuit with which said cashier memory pack is mechanically, electrically and removably coupled; and a data processing unit connec

An electronic cash register comprising: a keyboard having a plurality of entry keys and at least one function key; memory means; a cashier memory pack; a first interface circuit with which said cashier memory pack is mechanically, electrically and removably coupled; and a data processing unit connected to said keyboard, said memory means and said first interface, and which is responsive to the operation of keys on said keyboard to write sales information into said memory means and to accumulatively write at least total sales data for each transaction in the sales information into said cashier memory pack coupled with said first interface circuit.