Electronic cash register and related registration and display system

摘要

Each item is assigned by a combination of a main code and a sub code. During a registration of ordered items, each ordered item is displayed according to a first classification based on the main code and the sub code. The display screen is changed in response to a depression of a subtotal key or a total key. After the subtotal key or the total key is depressed, the ordered item is displayed according to a second classification based on the main code only.