A card reader for a point-of-sale system that is configured to accept both magnetic strip-type and integrated circuit (IC) chip-type payment cards. The card reader is a component of a point-of-sale system including a portable computing device in communication with the card reader that is configured to present a first graphical user interface (GUI) when a magnetic stripe-type card is detected and a second GUI when an IC chip-type card is detected in the card reader. The card reader comprises a slot configured to receive the payment card, a magnetic reading device and an IC chip reading device. The card reader also includes a discriminator contact disposed within the slot that is configured to conduct across a surface of a metal pad of the IC chip-type card prior to the CI chip reading device making contact with the IC chip.