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FP750 Floating-Point Accelerator - Revision history
2026-11-08T16:43:37Z
Revision history for this page on the wiki
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Jnc: Ooops, FP780 was elsewhere
2024-05-31T14:01:57Z
<p>Ooops, FP780 was elsewhere</p>
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<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: VAX<del style="font-weight: bold; text-decoration: none;">-11/7xx Systems</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 </ins>VAX <ins style="font-weight: bold; text-decoration: none;">Processors</ins>]]</div></td></tr>
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Jnc
https://gunkies.org/w/index.php?title=FP750_Floating-Point_Accelerator&diff=34696&oldid=prev
Jnc: typo (use 'Show preview'. dummy!)
2024-05-31T14:00:03Z
<p>typo (use 'Show preview'. dummy!)</p>
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<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>
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Jnc
https://gunkies.org/w/index.php?title=FP750_Floating-Point_Accelerator&diff=34695&oldid=prev
Jnc: Correct cat
2024-05-31T13:59:05Z
<p>Correct cat</p>
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https://gunkies.org/w/index.php?title=FP750_Floating-Point_Accelerator&diff=34498&oldid=prev
Jnc: Covers the basics
2024-05-17T18:07:10Z
<p>Covers the basics</p>
<p><b>New page</b></p><div>The '''FP750 Floating-Point Accelerator''' was an optional [[floating point accelerator]] for the [[VAX-11/750]]'s [[KA750 CPU]]; some integer [[instruction]]s were sped up by it as well. The floating point instructions were performed by the [[microcode]] when the FP750 was not installed.<br />
<br />
It was implemented on one [[DEC card form factor|extended hex]] card, the L0001 FPA Floating Point Accelerator (FPA), which mounted in the VAX-11/750 [[backplane]] in slot 1.<br />
<br />
==Further reading==<br />
<br />
* ''FP750 Floating-Point Accelerator Technical Description'' (EK-FP750-TD) - not online<br />
<br />
==External links==<br />
<br />
* [http://www.bitsavers.org/pdf/dec/vax/handbook/VAX_Hardware_Handbook_Volume_1_1986.pdf VAX Hardware Handbook Volume 1] - the FP750 is covered in Chapter 4 (pp. 171 of the PDF)<br />
* [https://vt100.net/mirror/hcps/si75fin1.pdf VAX-11/750 Installation Manual] (EK-SI75F-IN-001) - the FP750 is covered in Chapter 6 (pg. 113 of the PDF)<br />
* [https://vt100.net/mirror/antonio/ek-vaxv3-hb-001.pdf VAX Maintenance Handbook VAX-11/750] (EK-VAXV3-HB-001) - the layout of the FP750 is given on pg. 66 (pg. 78 of the PDF), with a description of the custom [[gate array]]s on the following page, and a block diagram on pp. 185-186 (pg. 197-198)<br />
* [https://bitsavers.org/pdf/dec/vax/750/MP01269_FP750_Engineering_Drawings_198112.pdf FP750 Field Maintenance Print Set] (MP01269)<br />
* [https://web.archive.org/web/20071004184622/http://computer-refuge.org/compcollect/dec/vax/11750/L0001-big.jpg L0001 (FPA)] - FP750 Floating Point Accelerator image<br />
<br />
[[Category: DEC VAX systems]]</div>
Jnc