Electronic cash registers

Abstract From the Canadian patent

An electronic cash register comprises a read only memory, a central processor unit, entry and function keys a, memory including an entry memory storing input data from the entry keys and first and second data memories storing respectively first and second data, a double function key for transferring first data to the first data memory and second data to the second data memory, and printing means for printing data, price total and the first and second data. The memory comprises a first flag memory storing a "1" when the entry memory stores the first data and a second flag memory which stores a binary bit "1" when first data is transferred from the entry memory to the first data memory. When …