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A conventional cash register unit is modified to include a cashier input unit having a switch and/or keys or the like for entering a limit value equal to the maximum total bill authorized for a given transaction by an individual customer. A limit indicator unit is coupled to the cashier unit for gen

A conventional cash register unit is modified to include a cashier input unit having a switch and/or keys or the like for entering a limit value equal to the maximum total bill authorized for a given transaction by an individual customer. A limit indicator unit is coupled to the cashier unit for generating a signal to the clerk and the customer when the accumulated total, including tax, is within a predetermined margin of the limit value. Preferably, the limit indicating unit displays several kinds of information, including the authorized limit value, the running total of the accumulated bill, an alarm signal indicating that the accumulating amount is within a predetermined margin of the authorized limit, as well as a limit signal indicating when the authorized limit has been reached. Also, the price of each item may be displayed.

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A cash register system comprising: a register unit including means for recording the price of each of a plurality of items to be purchased during a transaction and computing a total bill suitable for presentation to the customer at the end of the transaction; a cashier unit including means for gener

A cash register system comprising: a register unit including means for recording the price of each of a plurality of items to be purchased during a transaction and computing a total bill suitable for presentation to the customer at the end of the transaction; a cashier unit including means for generating a signal indicative of a limit value equal to the maximum authorized total bill for an individual customer in a given transaction, means operatively connected to the register unit for generating a signal indicative of the price to be recorded for each item to be purchased during said transaction, means for generating a signal indicative of the taxability status of an individual item, and means for generating a margin signal commensurate with a margin desired by the customer for a given transaction relative to said limit value; a limit indicating unit coupled to the cashier unit, including means responsive to said means for generating a signal indicative of the price to be recorded and to said means for generating a signal indicative of the taxability status of an individual item, for computing an accumulated value of the prices including tax of the items to be recorded in the register unit, means responsive to said limit value signal and said margin signal for storing an alarm value less than the limit value, means for comparing the alarm value with the accumulated value, means for generating a first humanly perceptible signal when the accumulated value is at least equal to the alarm value, means for comparing the accumulated value to the limit value, and means for generating a second humanly perceptible signal when the accumulated value equals or exceeds the limit value.