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The original PCMCIA bus was 16-bit, similar to ISA. CardBus is effectively a 32-bit, 33 MHz PCI bus, in the same physical form as the earlier cards. The notch on the left hand front of the card is slightly shallower on a CardBus card so a 32-bit card cannot be plugged into a slot that can only accept 16-bit cards. Most slots are compatible with both the CardBus and the original 16-bit cards.CardBus includes the bus mastering ability, which allows a controller on the bus to talk to other devices or memory without going through the CPU. Many chipsets are available for both PCI and CardBus cards, such as those that support Wi-Fi.