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The classroom projector that you choose will have to connect to your computer. Whether your school is using Macintosh or IBM PCs you will need to check the Data Signal Ports on the projector to ensure that it will adequately connect to your computers and other equipment. You may need to purchase additional adapters to connect the computer projector to a Macintosh computer. Keep this in consideration when purchasing a projector and make sure that it is compatible with a Macintosh.