Editing Cyrix (section)

=== Cyrix FasMath coprocessors ===
[[Image:KL Cyrix FasMath CX83D87.jpg|thumb|right|150px|Cyrix FasMath]]

The first Cyrix product for the [[personal computer]] market was a [[x87]] compatible [[Floating point unit|FPU]] [[coprocessor]]. The Cyrix FasMath 83D87 and 83S87 were introduced in November 1989.<ref>{{Cite news|last=Copeland|first=Ron|date=27 November 1989|title=Intel Claims Coprocessors Aren't Fully Compatible|volume=11|pages=8|work=[[InfoWorld]]|issue=48|publisher=[[InfoWorld Media Group, Inc.]]|url=https://books.google.com/books?id=tzAEAAAAMBAJ&dq=Cyrix+FasMath+83D87&pg=PT7|access-date=17 February 2022|issn=0199-6649}}</ref> The 83D87 was pin compatible with the [[Intel 80387SX|Intel 80387]], while the 83S87 was pin compatible with the [[Intel 80387SX|80387SX]]. Both provided up to 50% more performance, and additionally they had lower power consumption when idle, due to a low power operation.<ref>{{Cite book|url=https://www.datasheetarchive.com/pdf/download.php?id=411f62a720dd26c6c0327041b3188f3238b653&type=O&term=Cyrix%2520FasMath|title=Cyrix FasMath™ 83D87 Processor|publisher=Cyrix|year=1990}}</ref> Upon release the 83S87 cost $506 for a 16-MHz version and $556 for a 20-MHz version.<ref>{{Cite news|last1=Dryden|first1=Patrick|last2=Marshall|first2=Martin|date=26 March 1990|title=Cyrix Low-Drain Coprocessors Promise Faster Calculations|volume=12|pages=21|work=[[InfoWorld]]|issue=13|publisher=[[InfoWorld Media Group, Inc.]]|url=https://books.google.com/books?id=1DsEAAAAMBAJ&dq=Cyrix+FasMath+83S87&pg=PT20|access-date=17 February 2022|issn=0199-6649}}</ref> The Cyrix FasMath 82S87, a [[Intel 80287|80287]]-compatible chip, was developed from the Cyrix 83D87 and has been available since 1991.

[[Image:KL Cyrix 486DRx2.jpg|thumb|right|150px|Cyrix Cx486DRx² microprocessor]]