Hi, just a very basic question here; I've done some research, but can't find the answer to this, so I figured that someone here would know...

The Motorola 68000 microprocessor chip found on the logic boards of early compact Macs is about 1"X4" in size. If I were to take the plastic black casing off, how much of the chip is actually the silicon 'chip', the actual wafer with the 68,000 transistors etched onto it?

-Apostrophe