https://gunkies.org/index.php?action=history&feed=atom&title=MX15-A_Memory_Bus_Multiplexer 2026-06-12T23:06:27Z Revision history for this page on the wiki MediaWiki 1.30.1 https://gunkies.org/w/index.php?title=MX15-A_Memory_Bus_Multiplexer&diff=28249&oldid=prev 2022-12-01T14:49:59Z

<p>copy-edit</p> <table class="diff diff-contentalign-left" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr style="vertical-align: top;" lang="en"> <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 14:49, 1 December 2022</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l1" >Line 1:</td> <td colspan="2" class="diff-lineno">Line 1:</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 '''MX15-A Memory Bus Multiplexer''' is a [[PDP-15]] sub-system which has three input ports, and one output port which can be connected to 32K [[word]]s of [[core memory|core]] [[main memory]]. PDP-15 [[Central Processing Unit|CPU]]'s and [[Direct Memory Access|DMA]] [[peripheral]]s can be connected to the input ports. <del class="diffchange diffchange-inline">The </del>MX15-A <del class="diffchange diffchange-inline">allows the input ports access to the main memory on a priority basis</del>; <del class="diffchange diffchange-inline">port 1 has the highest priority</del>, <del class="diffchange diffchange-inline">and port 3 has </del>the <del class="diffchange diffchange-inline">lowest</del>.</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 '''MX15-A Memory Bus Multiplexer''' is a [[PDP-15]] sub-system which has three <ins class="diffchange diffchange-inline">[[memory bus]] </ins>input ports, and one output port<ins class="diffchange diffchange-inline">, </ins>which can be connected to 32K [[word]]s of [[core memory|core]] [[main memory]]. PDP-15 [[Central Processing Unit|CPU]]'s and [[Direct Memory Access|DMA]] [[peripheral]]s can be connected to the input ports. <ins class="diffchange diffchange-inline">A PDP-15 CPU can be connected to up to four </ins>MX15-A<ins class="diffchange diffchange-inline">'s</ins>; <ins class="diffchange diffchange-inline">thus</ins>, the <ins class="diffchange diffchange-inline">total memory provided to it can be up to 128K words</ins>.</div></td></tr> <tr><td class='diff-marker'>&#160;</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'>&#160;</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><del class="diffchange diffchange-inline">A PDP-15 CPU can be connected to up to four </del>MX15-A<del class="diffchange diffchange-inline">'s</del>; <del class="diffchange diffchange-inline">thus</del>, the <del class="diffchange diffchange-inline">total memory provided can be up to 128K words</del>.</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><ins class="diffchange diffchange-inline">The </ins>MX15-A <ins class="diffchange diffchange-inline">allows the input ports access to the main memory on a priority basis</ins>; <ins class="diffchange diffchange-inline">port 1 has the highest priority</ins>, <ins class="diffchange diffchange-inline">and port 3 has </ins>the <ins class="diffchange diffchange-inline">lowest</ins>.</div></td></tr> <tr><td class='diff-marker'>&#160;</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'>&#160;</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'>&#160;</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>==External links==</div></td><td class='diff-marker'>&#160;</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>==External links==</div></td></tr> <!-- diff cache key mediawiki-wiki_:diff:version:1.11a:oldid:28246:newid:28249 --> </table>

Jnc https://gunkies.org/w/index.php?title=MX15-A_Memory_Bus_Multiplexer&diff=28246&oldid=prev 2022-11-30T22:57:38Z

<p>-A and -B are quite different</p> <p><b>New page</b></p><div>The '''MX15-A Memory Bus Multiplexer''' is a [[PDP-15]] sub-system which has three input ports, and one output port which can be connected to 32K [[word]]s of [[core memory|core]] [[main memory]]. PDP-15 [[Central Processing Unit|CPU]]'s and [[Direct Memory Access|DMA]] [[peripheral]]s can be connected to the input ports. The MX15-A allows the input ports access to the main memory on a priority basis; port 1 has the highest priority, and port 3 has the lowest.<br /> <br /> A PDP-15 CPU can be connected to up to four MX15-A's; thus, the total memory provided can be up to 128K words.<br /> <br /> ==External links==<br /> <br /> * [http://bitsavers.org/pdf/dec/pdp15/hardware/DEC-15-H2XB-D_MX15_Aug71.pdf MX15 Memory Bus Multiplexer Maintenance Manual Volume 1] (DEC-15-H2XB-D)<br /> * [http://bitsavers.org/pdf/dec/pdp15/hardware/DEC-15-H2XB-D_MX15_EngrDrws_Sep71.pdf MX15 Memory Bus Multiplexer Maintenance Manual Volume 2 - Engineering Drawings] (DEC-15-H2XB-D)<br /> <br /> [[Category: PDP-15s]]</div>

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