METHOD OF MODIFYING PROGRAMS STORED IN CASH REGISTER

摘要

An improved electronic cash register comprising a memory containing addresses identical to those of a mask ROM which permanently stores a variety of trade processing programs and stores data indicating whether any change should be applied to such programs stored in those addresses and other memories storing the memory bank data memorizing the addresses of the modified programs among such programs stored in the mask ROM and the modified programs and also storing the modified programs themselves. The electronic cash register can easily and securely store a variety of data necessary for changing programs stored in the mask ROM in the memories via an input provided for inputting and processing a variety of trading data.