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When did AMD start making clones of Intel chips? What was the first chip they cloned?

closed as not constructive by studiohack Apr 16 '11 at 8:50

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From the wikipedia article:

In February 1982, AMD signed a contract with Intel, becoming a licensed second-source manufacturer of 8086 and 8088 processors. IBM wanted to use the Intel 8088 in its IBM PC, but IBM's policy at the time was to require at least two sources for its chips. AMD later produced the Am286 under the same arrangement, but Intel canceled the agreement in 1986 and refused to convey technical details of the i386 part. AMD challenged Intel's decision to cancel the agreement and won in arbitration, but Intel disputed this decision. A long legal dispute followed, ending in 1994 when the Supreme Court of California sided with AMD. Subsequent legal disputes centered on whether AMD had legal rights to use derivatives of Intel's microcode. In the face of uncertainty, AMD was forced to develop clean room designed versions of Intel code.

http://en.wikipedia.org/wiki/Advanced_Micro_Devices

The first computer my family owned, purchased in 1992, contained an AMD 386 processor.

  • So is the first chip they came out with the 386? – tony_sid Apr 15 '11 at 20:31
  • I believe the article states they first built the 8086 and 8088 due to a requirement of IBM that they source components from two vendors. Later, they built the 286, and due to legal problems with Intel, they had to reverse engineer the 386 in order to make it. – music2myear Apr 18 '11 at 16:39
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Though not an answer, a couple minor things people may find interesting.

Intel came out with the 486, called it the i486 (for Intel obviously). They tried to trademark it, the judge threw it out. Just 26 companies could trademark the whole language (same reasoning when Zilog tried to trademark Z80). They learned they needed a name, and came out with Pentium(TM).

The licensing agreement actually helped Intel once 64 bit extensions came out. They put their bets on Itanium. AMD came out with AMD64 extensions and cleaned up in the market. Eventually Intel saw the handwriting on the wall and copied the extensions as EM64T. They could because of the original licensing agreement.

The most advanced Pentium class processor design probably was Cyrix 5x86. It bridged the gap by dividing CISC instructions into microops that were more RISC like and easier to process. The new processors now all do this, and the newest chips not only decode to microops, but they cache the microops and not the x86 instructions anymore.

  • I'm pretty sure that wasn't the 5x86, but rather the 6x86. – Tripp Kinetics Apr 18 at 18:37
  • @TrippKinetics it was the Cyrix 5x86. The intel that did that was indeed the 686 line. – Rich Homolka Apr 20 at 3:38
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    I just did some research on the subject. My memory of the time was correct. The Cyrix 5x86 fits the Socket 3, which makes it a 486-compatible. The Cyrix 6x86 fits the Socket 5, which was the socket for the Pentium. Intel never released a chip called 686, for the trademark reasons you indicated in your answer. BTW, AMD did something similar. The fastest 486 chip ever made was the AMD 5x86-P75, which was a 486 running at 133MHz. Back in the day, I ran one with a fancy high-end cooler at 200MHz (50MHz FSB x4). – Tripp Kinetics Apr 23 at 20:54
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    I might still have the chips in my collection somewhere. I should see if I can take some pictures. – Tripp Kinetics Apr 23 at 20:59

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