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View Diary: Smart Economy: Crazy Market "Logic" & the 486 Computer Chip (32 comments)

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  •  And (0+ / 0-)

    No evidence was presented that they were intentionally disabled.

    However, leftycoaster explained in detail that many were defective.

    So, go ask the diarist for the evidence that the FPU's were disabled.

    Republicans: Taking the country back ... to the 19th century

    by yet another liberal on Mon Jul 15, 2013 at 09:05:38 PM PDT

    [ Parent ]

    •  See Wikipedia (1+ / 0-)
      Recommended by:
      enhydra lutris

      http://en.wikipedia.org/...

      486SX (P23) : "An i486DX with the FPU part disabled or missing. Early variants were parts with disabled (defective) FPUs.[5] Later versions had the FPU removed from the die to reduce area and hence cost."

      486SX2: "i486DX2 with the FPU disabled"

      It sounds like several viewpoints in the diary & comments are at least partly right.  Some later 486SX's were made with no FPU (math processor).  Some 486SX's had had defective FPU's. (An Intel webpage also shows the introduction date of the 486DX as 2 years before the 486SX.  This probably reflects the DX as a chip with an FPU, however Intel's 386DX chip didn't have an FPU.)  The 486SX2 had a disabled FPU that had not been defective.

      Regarding marketing, Intel sold a "487 chip" as a math processor as an add-on to a 486SX.  In reality, the 487 was a 486DX chip with an extra pin which shut down the PC's 486SX and took over all its work.

      "We all too often have socialism for the rich and rugged free capitalism for the poor." - Martin Luther King Jr.

      by workingwords on Tue Jul 16, 2013 at 06:11:18 AM PDT

      [ Parent ]

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