https://gunkies.org/index.php?action=history&feed=atom&title=MX15-A_Memory_Bus_Multiplexer 2026-09-21T13:55:01Z Revision history for this page on the wiki MediaWiki 1.43.9 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 style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: #fff; color: #202122; 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" data-marker="−"></td><td style="color: #202122; 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 style="font-weight: bold; text-decoration: none;">The </del>MX15-A <del style="font-weight: bold; text-decoration: none;">allows the input ports access to the main memory on a priority basis</del>; <del style="font-weight: bold; text-decoration: none;">port 1 has the highest priority</del>, <del style="font-weight: bold; text-decoration: none;">and port 3 has </del>the <del style="font-weight: bold; text-decoration: none;">lowest</del>.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; 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 style="font-weight: bold; text-decoration: none;">[[memory bus]] </ins>input ports, and one output port<ins style="font-weight: bold; text-decoration: none;">, </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 style="font-weight: bold; text-decoration: none;">A PDP-15 CPU can be connected to up to four </ins>MX15-A<ins style="font-weight: bold; text-decoration: none;">'s</ins>; <ins style="font-weight: bold; text-decoration: none;">thus</ins>, the <ins style="font-weight: bold; text-decoration: none;">total memory provided to it can be up to 128K words</ins>.</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; 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 style="font-weight: bold; text-decoration: none;">A PDP-15 CPU can be connected to up to four </del>MX15-A<del style="font-weight: bold; text-decoration: none;">'s</del>; <del style="font-weight: bold; text-decoration: none;">thus</del>, the <del style="font-weight: bold; text-decoration: none;">total memory provided can be up to 128K words</del>.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; 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 style="font-weight: bold; text-decoration: none;">The </ins>MX15-A <ins style="font-weight: bold; text-decoration: none;">allows the input ports access to the main memory on a priority basis</ins>; <ins style="font-weight: bold; text-decoration: none;">port 1 has the highest priority</ins>, <ins style="font-weight: bold; text-decoration: none;">and port 3 has </ins>the <ins style="font-weight: bold; text-decoration: none;">lowest</ins>.</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==External links==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==External links==</div></td></tr> <!-- diff cache key mediawiki-wiki_:diff:1.41:old-28246:rev-28249:php=table --> </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 &#039;&#039;&#039;MX15-A Memory Bus Multiplexer&#039;&#039;&#039; 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]]&#039;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&#039;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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