https://gunkies.org/index.php?action=history&feed=atom&title=FP780_Floating-Point_Accelerator 2026-09-20T17:42:34Z Revision history for this page on the wiki MediaWiki 1.43.9 https://gunkies.org/w/index.php?title=FP780_Floating-Point_Accelerator&diff=26971&oldid=prev 2022-07-08T11:53:01Z

<p>+link</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 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" 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 '''FP780 Floating-Point Accelerator''' was an optional [[floating point]] <del style="font-weight: bold; text-decoration: none;">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]].  </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 '''FP780 Floating-Point Accelerator''' was an optional [[floating point <ins style="font-weight: bold; text-decoration: none;">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]].  </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>==Implementation==</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>==Implementation==</div></td></tr> <!-- diff cache key mediawiki-wiki_:diff:1.41:old-24954:rev-26971:php=table --> </table>

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

<p><span class="autocomment">External links: </span> typo</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 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"></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> <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>* [http://www.bitsavers.org/pdf/dec/vax/780/EK-FP780-TD-001_FP780_Technical_Description_197812.pdf FP780 Floating-Point Accelerator <del style="font-weight: bold; text-decoration: none;">Technical Description </del>Technical Description] (EK-FP780-TD-001)</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>* [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"></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>[[Category: DEC VAX Processors]]</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>[[Category: DEC VAX Processors]]</div></td></tr> <!-- diff cache key mediawiki-wiki_:diff:1.41:old-24950:rev-24954:php=table --> </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 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 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"></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>* [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"></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>* [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"></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>[[Category: <del style="font-weight: bold; text-decoration: none;">VAXen</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>[[Category: <ins style="font-weight: bold; text-decoration: none;">DEC VAX Processors</ins>]]</div></td></tr> <!-- diff cache key mediawiki-wiki_:diff:1.41:old-24939:rev-24950:php=table --> </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 &#039;&#039;&#039;FP780 Floating-Point Accelerator&#039;&#039;&#039; was an optional [[floating point]] accelerator for the [[VAX-11/780]]&#039;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]]&#039;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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