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The Pentium Flaw was originally a problem with the Pentiums microprocessor’s math coprocessor, or floating-point unit (FPU). The Pentium Flaw was discovered at Lynchburg College in 1994 when a math professor, by the name of Thomas Nicely, was calculating sum of reciprocals, using his Pentium computer and noticed that the Pentium calculations were slightly off from the theoretical aspects. He tried another computer and ended up with the correct results and then based the source of the problem on the Pentium itself. He sent an inquiry to Intel about their Pentium flaw, when he received no response he politely posted a notice on the internet if others have confirmed his suspicions. Intel’s response to the flaw was
"An error is only likely to occur [about] once in nine billion random floating point divides", and that "an average spreadsheet user could encounter this subtle flaw once in every 27,000 years of use." (Janeba, 1995) What was the flaw in the Pentium Flaw? The article I read on what the Pentium Flaw was said:
“The mathematical basis for the bug: The built-in divider in the Pentium FPU uses a radix 4 SRT algorithm. The strength of this algorithm is that it can compute two (binary) digits of a quotient per step, rather than only one per step as in earlier Intel FPU's. The weakness is that the algorithm needs a stored table of values (a "division table", not unlike a "multiplication table"). This table was incorrectly entered into the Pentium FPU -- five entries out of about a thousand were omitted. As in normal long division, at each step in dividing m by n, the Pentium looks at the first few digits of n and of the remainder so far. It uses these as column and row entries in its table to estimate the next few digits of the quotient, then multiplies and subtracts to get the next remainder by the usual method. The table includes negative entries

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## Unit 5 Analysis 1 Pentium Flaw

702 Words | 3 PagesIn 1994 the public began to notice a flaw. Flaws are not uncommon in complicated integrated circuits, and most of them go unnoticed by the user, however, the Pentium flaw was very different. The nature of the flaw was in the floating point math subsection of the Pentium microprocessor, it caused incorrect answers when preforming double-precision arithmetic. In October of 1994 a man named Thomas Nicely, a mathematics professor at Lynchburg collage in Virginia was the first to notice this flaw. He found that the results of some of his calculations were incorrect.

## Pentium Flaw Essay

331 Words | 2 PagesRodolfo Llorella Jr. NT1110: Computer Structure and Logic Unit 5 Analysis 1 Pentium Flaw In 1994, Intel release it’s Pentium microprocessor with a new component called Floating-Point Unit (FPU). These Pentium chips containing the FPU made doing intense numerical calculations faster. During the fall of 1994, it was discovered that there was a flaw with the FPU instructions of division of large calculations. This flaw caused the Pentium’s FPU to divide numbers incorrectly. Only certain type of numbers showed the error, while most users would never encounter the flaw.

## Nt1110 Unit 5 Analysis Pentium Flaw

357 Words | 2 PagesUnit 5 Analysis 1: Pentium Flaw The Pentium flaw was a flaw in a microprocessor that caused incorrect calculations on certain common equations. This caused many people to have issues with doing calculations on their PC. It became public in 1994 when a university researcher was performing calculations and discovered several calculations were being performed incorrectly by his PC while doing double-precision arithmetic. Intel’s initial response was denying that there was a problem, but after enough people said there was a problem, they changed their statement to say that there was indeed a problem, but that it was a small problem that wouldn’t affect many people. Many of Intel’s customers were not satisfied by this answer, and started wanting their chips replaced.

## Nt1110 Unit 10 Lab

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