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Just like about everything else that has to do with the PC, Buses started evolving around 1983-1984. In 1984, IBM introduced the IBM PC AT computer, and the PC AT computer used the ISA Bus - the Industry Standard Architecture Bus. This is a 16 bit Bus, which meant that it could have a 16-lane highway on which bits could travel: zeros and ones. But about three years later in 1987, IBM had introduced a new Bus called the MCA Bus. And the Industry, not wanting to pay the royalties to use that Bus, came up with their own 32 bit Bus called an EISA Bus - the Extended Industry Standard Architecture Bus. This was developed by many different companies in order not to pay royalties to IBM to use their MCA Bus. And the EISA Bus offered a 32 bit Bus; it could be used for dual purposes, so we can have a card that performed more than one function. Like maybe a game card that provided a joystick port, a sound card as well as a video card. But now EISA is nearly extinct, because PCI (Peripheral Component Interface) offers even more. So we are going to discuss the most common buses that we are likely to come in contact with. But before we do, let's take a look at some of the older buses that didn't make it. IBM introduced the Micro Channel Architecture Bus, the MCA Bus, in an attempt to capture the market. They felt like they had a superior Bus because it was a 32 bit Bus at the time when other manufacturers were using 16 bit buses. But they charge royalties to manufacturers to use their bus. And so when the EISA bus came out, it made the MCA bus extinct, because why would the manufacturers pay IBM a royalty to use a 32 bit bus when they could come up with their own bus that was also a 32 bit bus. Then when PCI Buses came out, they were even better. And so we are not likely to run in to a MCA (Micro Channel Architecture) Bus. As video became more and more sophisticated, we needed faster buses for video. So in 1992, a bus was developed specifically as an extension for video memory and was called a VESA local Bus. But VESA Local Buses are nowhere near as efficient as the AGP or Accelerated Graphics Port Buses that are now available today. So you are not likely to run into a VESA local bus either. But these buses are good to know for the test. It's important to know the evolution of the buses and also to know what the different types of buses were made for. Such as the fact that the VESA Local Bus was developed specifically for video. In our next section, we will take a look at some of the buses that you are most likely to run into on a day-to-day basis.