Men section has a test for checking the operation of the microwave input on Macintoshes that have the built-in capability to connect a microwave. Unfortunately, some of the Macs that have a microwave input use the same IC chip to do both audio input and audio output. This chip is unable to "walk and chew gum" at the same time. For this reason, some machines that do have built-in wave input capability will not give the user the option of testing this function. If the "Input" button shows up in the Hancock area, the test is available, otherwise, it is not.