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<p><a href="page.php?w=Image%3ABBC_Teletext_Adapter.jpg">thumb</a>A <b>BBC Micro expansion unit</b>, for the <a href="page.php?w=BBC_Micro">BBC Micro</a> is one of a number of peripherals in a box with the same profile and styling as the main computer.</p>

<p><big>Second processors</big></p>
<p>The second processors are connected to Acorn's proprietary and trademarked <a href="page.php?w=Tube_%28BBC_Micro%29">''Tube'' interface</a>. Only one second processor unit could be connected at a time to a BBC Micro, although a Master 128 could also have a co-processor</p><p>
<a accesskey="3" href="page.php?w=BBC_Micro_expansion_unit&amp;p=2">3.Next</a>
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