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This forum is part of our mission to promote the preservation of vintage computers through education and outreach. (In real life we also run events and have a museum.) We encourage you to join us, participate, share your knowledge, and enjoy.

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Happy 20th Birthday, Pentium!

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    Happy 20th Birthday, Pentium!

    (From the Article):

    "Twenty years ago today, Intel launched the Pentium 60 CPU and changed the computing world for ever. Believe it or not, a revision of the original Pentium core still lives on today, in Intelís bleeding-edge, 50-core Xeon Phi ó a plug-in coprocessor that ushers us towards exascale supercomputing..."

    http://www.extremetech.com/computing...rthday-pentium

    #2
    Well happy birthday then.

    BTW, a friend of mine is purchasing old CPUs for goldscraps and he agreed to let me test them before he scraps them. I'm currently looking into how far these CPUs (mainly Pentium & Pentium MMX) overclock and I've checked about 20 of them so far.

    Comment


      #3
      Don't you mean it's Pentium's 20.0004835836930263th birthday?
      I use my C128 because I am an ornery, stubborn, retro grouch. -- Bob Masse
      Various projects and oddities: http://oldvcr.blogspot.com/
      Machine room: http://www.floodgap.com/etc/machines.html

      Comment


        #4
        Originally posted by ClassicHasClass View Post
        Don't you mean it's Pentium's 20.0004835836930263th birthday?
        I'm struggling big time to find a buggy Pentium 100 MHz. If I do, I'll look into the thing. In particular I'm interested in benchmarking the performance loss that occurred after the software workaround to the erratum.

        Comment


          #5
          The zing was a little unfair, I'll grant. But Intel will never live it down.

          The performance loss you mention is interesting, though. I never heard anything about that.
          I use my C128 because I am an ornery, stubborn, retro grouch. -- Bob Masse
          Various projects and oddities: http://oldvcr.blogspot.com/
          Machine room: http://www.floodgap.com/etc/machines.html

          Comment


            #6
            Originally posted by ClassicHasClass View Post
            The zing was a little unfair, I'll grant. But Intel will never live it down.

            The performance loss you mention is interesting, though. I never heard anything about that.
            I speculate that there will be some performance loss because later operating systems were avoiding to call certain functions when they detected a CPU with the bug. I can't see this happening without a performance hit, yet I don't know if it is negligible or not. Surely I don't expect it to be anywhere near the Phenom B2 TLB erratum.

            Comment


              #7
              It was a pretty big deal for the industry. From my hazy memory ...
              • It was the first dual pipeline in the x86 family. (Prior chips always had a single pipeline.)
              • It was the first of the family to always have floating point support.
              • It came in at about the same time as PCI, which was needed because existing buses were not going to be able to keep up
              • It was designed for dual CPU support too.



              As a side note, it was also the last of the line from Intel to execute x86 instructions in a hardwired manner. Later chips (Pentium Pro, Pentium II, etc.) moved to using micro-ops.


              Mike

              Comment


                #8
                I havn't found a chip with the FPU bug yet (have a few P60/66/90's)
                What I collect: 68K/Early PPC Mac, DOS/Win 3.1 era machines, Amiga/ST, C64/128
                Nubus/ISA/VLB/MCA/EISA cards of all types
                Boxed apps and games for the above systems
                Analog video capture cards/software and complete systems

                Comment


                  #9
                  I remember the hype at the time. Seemed it didn't affect day to day usage by the average Joe. Some, usually anti x86 folk, just haven't gotten over it even after all these years

                  No dought quite a collectable chip now.
                  Thomas Byers (DRI)- "You'll have a million people using the A> [MS-DOS prompt] forever. You'll have five million using [nongraphic] menu systems such as Topview, Concurrent PC-DOS, Desq, and those types. But there'll be 50 to 100 million using the iconic-based interfaces."

                  Comment


                    #10
                    Surprised no one mentioned the F00F bug! Fun read though
                    '. \ / .'
                    '. .'``'. .'
                    ......:::::::`.....`::
                    Currently seeking a Compaq Deskpro 386

                    Comment


                      #11
                      My first pentium was 233Mhz!
                      GEEKS WITH A GRUDGE!

                      Comment


                        #12
                        Someone here came across the actual computer that the FDIV bug was discovered on.

                        http://www.vintage-computer.com/vcfo...m-Divider-Flaw

                        Comment


                          #13
                          "It was the first of the family to always have floating point support."

                          I think this honour should really go to the 486. At least this was the case from April 1989 until September 1991 when intel gave us the 486SuX. Even then, at least the first batch of 486SX chips had an FPU...though it was defective and disabled.
                          "Will the Highways on the internets become more few?"

                          V'Ger XT

                          Comment


                            #14
                            The 486 started with good intentions regarding floating point but it was watered down later on. Intel did not make the same mistake with the Pentium. So what I wrote is accurate.

                            After the Pentium, floating point was here to stay.

                            Comment


                              #15
                              To mark the occasion I bought a Compaq Presario 5522. Came complete with all the original cds and disks. Sports a P75.
                              Attached Files
                              Last edited by Caluser2000; March 24, 2013, 10:40 PM.
                              Thomas Byers (DRI)- "You'll have a million people using the A> [MS-DOS prompt] forever. You'll have five million using [nongraphic] menu systems such as Topview, Concurrent PC-DOS, Desq, and those types. But there'll be 50 to 100 million using the iconic-based interfaces."

                              Comment

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