Electronic cash register

Claim 1

An electronic cash register comprising: a keyboard having a plurality of entry keys and a plurality of transaction keys; first and second memory means; a printer; switching means capable of taking first and second positions; and data-processing means coupled to said switching means and being set at a tax set mode when said switching means takes said first position, to store in said first memory means information on the relationship between a taxable amount and a tax assessable thereon each time the entry key section and transaction key section are operated, and to issue a print instruction to said printer in response to the operation of a specified transaction key to cause said printer to print out information on the relationship between the taxable amount and tax assessable thereon, and said data processing means being set at a registration mode when said switching means takes said second position and being responsive to key depression to store in said second memory means information on a sales amount and a taxable amount, and, responsive to operation of a prescribed transaction key, to calculate a tax assessable on the taxable amount stored in said second memory means from information on the relationship between the taxable amount and tax assessable thereon which is stored in said first memory means; said first memory means including a first memory for storing information on the relationship between data of a taxable amount belonging to an unequally differentiated section and data corresponding to tax assessable thereon, information on the relationship between data on a taxable amount belonging to an equally differentiated section and data corresponding to tax assessable thereon, and a second memory for storing information on a prescribed tax rate; said second memory means including a third memory into which said data-processing means transfers data corresponding to a referential taxable amount in response to the operation of at least one of said entry keys and a specified one of said function keys; and said data-processing means including a comparator for comparing a registered taxable amount data and said referential taxable amount data stored in said second memory means, and coupled to energize said second memory when said registered taxable amount is larger than said referential taxable amount data, and to energize said first memory when said taxable amount data is not larger than said referential taxable amount data.