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<p>modularity, and although popular in the 1970s and 1980s, more modern computers use a variety of separate buses adapted to more specific needs.</p>

<p>The <b>system level bus</b> (as distinct from a CPU's internal <a href="page.php?w=datapath">datapath</a> busses) connects the CPU to memory and I/O devices.Typically a system level bus is designed for use as a <a href="page.php?w=backplane">backplane</a>.</p>

<p><big>Background scenario</big></p>
<p>Many of the computers were based on the <a href="page.php?w=First_Draft_of_a_Report_on_the_EDVAC">First Draft of a Report on the EDVAC</a></p><p>
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