Hehe, there are some conditions for this question, and the answer depends on guessing. Is your small printer connected to the bank's credit card system? If so, the reason is simple. When swiping a card, the dial-up channel of broadband Internet access is squeezed out by system dial-up. Because the conditions are not perfect, I can only guess that it may be wrong. If you guess right, it's not complicated to solve. I'll give you two plans. First, set up a small printer, disable dial-up mode and connect locally. If you don't have this function, second, separate the printer group from the internet computer and dial up the internet.