https://gunkies.org/index.php?action=history&feed=atom&title=Bus_request_lineBus request line - Revision history2026-05-16T00:22:41ZRevision history for this page on the wikiMediaWiki 1.30.1https://gunkies.org/w/index.php?title=Bus_request_line&diff=36628&oldid=prevJnc: better word2025-07-28T06:24:10Z<p>better word</p>
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<td colspan="2" style="background-color: white; color:black; text-align: center;">← Older revision</td>
<td colspan="2" style="background-color: white; color:black; text-align: center;">Revision as of 06:24, 28 July 2025</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>'''Bus request lines''' are used in a number of [[bus]] architectures (for example, the [[UNIBUS]] and [[QBUS]]), for a [[device controller]] to communicate to the [[Central Processing Unit|CPU]] (or whatever circuitry is controlling the bus) that it is requesting an [[interrupt]] or [[Direct Memory Access|DMA]] bus cycle.</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>'''Bus request lines''' are used in a number of [[bus]] architectures (for example, the [[UNIBUS]] and [[QBUS]]), for a [[device controller]] to communicate to the [[Central Processing Unit|CPU]] (or whatever circuitry is controlling the bus) that it is requesting an [[interrupt]] or [[Direct Memory Access|DMA]] bus cycle.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>The device controller does this by asserting the bus request line to the CPU, to notify it. Such lines are usually <del class="diffchange diffchange-inline">wired </del>as [[wired-OR]] lines, to enable them to be used in [[broadcast]] mode.</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>The device controller does this by asserting the bus request line to the CPU, to notify it. Such lines are usually <ins class="diffchange diffchange-inline">instantiated </ins>as [[wired-OR]] lines, to enable them to be used in [[broadcast]] mode.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>==See also==</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>==See also==</div></td></tr>
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</table>Jnchttps://gunkies.org/w/index.php?title=Bus_request_line&diff=36627&oldid=prevJnc: High on our 'pages requested' list2025-07-27T18:30:34Z<p>High on our 'pages requested' list</p>
<p><b>New page</b></p><div>'''Bus request lines''' are used in a number of [[bus]] architectures (for example, the [[UNIBUS]] and [[QBUS]]), for a [[device controller]] to communicate to the [[Central Processing Unit|CPU]] (or whatever circuitry is controlling the bus) that it is requesting an [[interrupt]] or [[Direct Memory Access|DMA]] bus cycle.<br />
<br />
The device controller does this by asserting the bus request line to the CPU, to notify it. Such lines are usually wired as [[wired-OR]] lines, to enable them to be used in [[broadcast]] mode.<br />
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==See also==<br />
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* [[Non-Processor Request and Grant]] - UNIBUS DMA request and grant lines<br />
* [[DMA Request and Grant]] - QBUS DMA request and grant lines<br />
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[[Category: Hardware Basics]]</div>Jnc