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The Powerbook 520/520c is equipped with a 25MHz, 68LC040 processor and a passive-matrix display. The Powerbook 540/540c is equipped with a 33MHz, 68LC040 processor and an active-matrix display. A 'c' indicates that the display is in color. Both units list M4880 as their model number.

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My keyboard is kind of springy

My powerbook 520 keyboard is pretty springy. I got this Mac used, so I don't know what they are supposed to feel like. If I don't hit them dead centre they don't go down easily. Is this just mine or is everyone's like this?

Thanks!

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This machine was introduce in 1994 so there are not many still in use. I would try canned air to help clean any debris that may be residing under the keys.

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