A point-of-sale (POS) system includes a counter, a cash processing machine, and a register machine. The cash processing machine has a cash receiving port and a cash dispensing port that are accessible from a first lateral side of the counter but not a second lateral side of the counter that is opposite to the first lateral side. The register machine has a display and an operational panel and coupled with the cash processing machine such that the display and the operational panel face the second lateral side.