Questions about POS

[mandiuk]

I have some questions about using POS. If I were a store owner, could I swipe card directly from dump code 201 without chip card ? Although I have POS machine, must I use chip card ?
When people who don't have POS use card as payment method, must they use chip card that is written by emv software ?
It is said that after doing 3 times error chip card, POS require magnetic card, then we can swipe magnetic card. Which people can do like that : people having POS or people buying instore ?