https://gunkies.org/index.php?action=history&feed=atom&title=FP780_Floating-Point_Accelerator 2026-05-01T00:37:39Z Revision history for this page on the wiki MediaWiki 1.30.1 https://gunkies.org/w/index.php?title=FP780_Floating-Point_Accelerator&diff=26971&oldid=prev 2022-07-08T11:53:01Z

<p>+link</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 11:53, 8 July 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 '''FP780 Floating-Point Accelerator''' was an optional [[floating point]] <del class="diffchange diffchange-inline">accelerator </del>for the [[VAX-11/780]]'s [[KA780 CPU]]; the floating point [[instruction]]s were performed by the microcode when it was not installed. It was installed in slots 24 through 28 of the [[CPU]]'s [[backplane]]. &#160;</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 '''FP780 Floating-Point Accelerator''' was an optional [[floating point <ins class="diffchange diffchange-inline">accelerator</ins>]] for the [[VAX-11/780]]'s [[KA780 CPU]]; the floating point [[instruction]]s were performed by the microcode when it was not installed. It was installed in slots 24 through 28 of the [[CPU]]'s [[backplane]]. &#160;</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>==Implementation==</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>==Implementation==</div></td></tr> <!-- diff cache key mediawiki-wiki_:diff:version:1.11a:oldid:24954:newid:26971 --> </table>

Jnc https://gunkies.org/w/index.php?title=FP780_Floating-Point_Accelerator&diff=24954&oldid=prev 2022-01-03T13:18:33Z

<p>‎<span dir="auto"><span class="autocomment">External links: </span> typo</span></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 13:18, 3 January 2022</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l23" >Line 23:</td> <td colspan="2" class="diff-lineno">Line 23:</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> <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>* [http://www.bitsavers.org/pdf/dec/vax/780/EK-FP780-TD-001_FP780_Technical_Description_197812.pdf FP780 Floating-Point Accelerator <del class="diffchange diffchange-inline">Technical Description </del>Technical Description] (EK-FP780-TD-001)</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>* [http://www.bitsavers.org/pdf/dec/vax/780/EK-FP780-TD-001_FP780_Technical_Description_197812.pdf FP780 Floating-Point Accelerator Technical Description] (EK-FP780-TD-001)</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>[[Category: DEC VAX Processors]]</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>[[Category: DEC VAX Processors]]</div></td></tr> </table>

Jnc https://gunkies.org/w/index.php?title=FP780_Floating-Point_Accelerator&diff=24950&oldid=prev 2022-01-02T22:13:21Z

<p>Better cat</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 22:13, 2 January 2022</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l25" >Line 25:</td> <td colspan="2" class="diff-lineno">Line 25:</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>* [http://www.bitsavers.org/pdf/dec/vax/780/EK-FP780-TD-001_FP780_Technical_Description_197812.pdf FP780 Floating-Point Accelerator Technical Description Technical Description] (EK-FP780-TD-001)</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>* [http://www.bitsavers.org/pdf/dec/vax/780/EK-FP780-TD-001_FP780_Technical_Description_197812.pdf FP780 Floating-Point Accelerator Technical Description Technical Description] (EK-FP780-TD-001)</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>[[Category: <del class="diffchange diffchange-inline">VAXen</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>[[Category: <ins class="diffchange diffchange-inline">DEC VAX Processors</ins>]]</div></td></tr> </table>

Jnc https://gunkies.org/w/index.php?title=FP780_Floating-Point_Accelerator&diff=24939&oldid=prev 2022-01-02T15:09:26Z

<p>Has the basics</p> <p><b>New page</b></p><div>The '''FP780 Floating-Point Accelerator''' was an optional [[floating point]] accelerator for the [[VAX-11/780]]'s [[KA780 CPU]]; the floating point [[instruction]]s were performed by the microcode when it was not installed. It was installed in slots 24 through 28 of the [[CPU]]'s [[backplane]]. <br /> <br /> ==Implementation==<br /> <br /> It was implemented on five [[DEC card form factor|hex]] cards:<br /> <br /> {| class=&quot;wikitable&quot;<br /> ! Slot !! Board !! Acronym !! Function<br /> |-<br /> | 24 || M8285 || FNM || Normalization and fraction division<br /> |-<br /> | 25 || M8286 || FMH || Fraction multiplication (most significant bits)<br /> |-<br /> | 26 || M8287 || FML || Fraction multiplication (least significant bits)<br /> |-<br /> | 27 || M8288 || FAD || Fraction addition and subtraction<br /> |-<br /> | 28 || M8289 || FCT || Exponent manipulation and FPA control<br /> |}<br /> <br /> {{semi-stub}}<br /> <br /> ==External links==<br /> <br /> * [http://www.bitsavers.org/pdf/dec/vax/780/EK-FP780-TD-001_FP780_Technical_Description_197812.pdf FP780 Floating-Point Accelerator Technical Description Technical Description] (EK-FP780-TD-001)<br /> <br /> [[Category: VAXen]]</div>

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