When this work first appeared in 1991, you could build a computer out of mail order parts for half what it cost to buy one at a local dealer. Since then, prices for motherboards, memory, display monitors, and other components have plummeted to unheard of levels in the past year, making it possible to assemble a top-of-the-line, 100% IBM-compatible computer at less than one-third the cost of any commercially sold model. Build Your Own 80486 and Save...