Almost from the day Apple Computer introduced its Macintosh line in 1984, aficionados clamored for a portable version of the popular machine. This week Apple will finally unveil one. The delay was caused by the difficulty of producing a lightweight Mac with a graphics display as vivid as the larger models'. To achieve that clarity, insiders say, the new machine has an active- matrix screen, in which each of its thousands of picture elements will be controlled by an individual transistor. Instead of Apple's famous mouse, the new Mac has a cursor-control device called a trackball mounted on the keyboard.
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