https://gunkies.org/api.php?action=feedcontributions&feedformat=atom&user=McNeight 2026-05-17T10:41:05Z User contributions MediaWiki 1.30.1 https://gunkies.org/w/index.php?title=KEF11-A_floating_point_chip&diff=36707 2025-09-18T15:09:40Z

<p>McNeight: This page was the only one to reference a &quot;23-003C7-AA&quot; on Google, while the picture at the top of the page shows a 23-203C7-AA part number on the IC.</p> <hr /> <div>[[Image:KEF11-A.jpg|thumb|right|250px|KEF11-A chip installed]]<br /> <br /> The '''KEF11-A floating point chip''' is an optional [[integrated circuit|chip]] for [[KDF11 CPUs|PDP-11 CPUs]] which use the [[F-11 chip set]]. It contains [[microcode]] to implement the [[FP11 floating point|FP11]]-compatible [[floating point]].<br /> <br /> The KEF11-A requires the [[KTF11-A memory management chip]], since the floating point [[register]]s are actually in the KTF11-A (the reason why is unknown; although the KEF11-A is microcode, there are enough pins for both the data [[bus]], and the microcode bus).<br /> <br /> The KEF11-A is another dual carrier: the chips on it are [[DEC part number]]s 23-002C7-AA and 23-203C7-AA (only the A revision of both has been seen). The entire carrier is DEC part # 57-00001-01-A1 (although 57-00001-00 is occasionally seen - but with the same chip versions as the -01).<br /> <br /> ==Further reading==<br /> <br /> * ''11/23 Floating Point Compatibility'', [[MicroNote]] #066<br /> <br /> [[Category: PDP-11 Processors]]</div>

McNeight