What was the last CPU that did not have the x87 floating-point unit built in?












1















This Wikipedia page says the following:




Most x86 processors since the Intel 80486 have had these x87
instructions implemented in the main CPU




So the above quote means that some CPUs that were realeased after the Intel 80486 CPU did not have the x87 floating-point unit built in.



But what was the last CPU that did not have the x87 floating-point unit built in?










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    1















    This Wikipedia page says the following:




    Most x86 processors since the Intel 80486 have had these x87
    instructions implemented in the main CPU




    So the above quote means that some CPUs that were realeased after the Intel 80486 CPU did not have the x87 floating-point unit built in.



    But what was the last CPU that did not have the x87 floating-point unit built in?










    share|improve this question









    New contributor




    user12280 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.























      1












      1








      1








      This Wikipedia page says the following:




      Most x86 processors since the Intel 80486 have had these x87
      instructions implemented in the main CPU




      So the above quote means that some CPUs that were realeased after the Intel 80486 CPU did not have the x87 floating-point unit built in.



      But what was the last CPU that did not have the x87 floating-point unit built in?










      share|improve this question









      New contributor




      user12280 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.












      This Wikipedia page says the following:




      Most x86 processors since the Intel 80486 have had these x87
      instructions implemented in the main CPU




      So the above quote means that some CPUs that were realeased after the Intel 80486 CPU did not have the x87 floating-point unit built in.



      But what was the last CPU that did not have the x87 floating-point unit built in?







      history intel floating-point cpu x86






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      user12280 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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      share|improve this question









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      share|improve this question




      share|improve this question








      edited 1 hour ago









      manassehkatz

      3,132625




      3,132625






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      asked 2 hours ago









      user12280user12280

      232




      232




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          2 Answers
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          All Intel x86 CPUs since the 80486 line have included floating point instructions, i.e. everything from the Pentium* onwards. So the last Intel processor to lack an on-board floating-point unit (FPU) was the 80486SX (and the embedded 80486GX).



          Other manufacturers, who made 486-compatible processors, continued making non-FPU chips, aiming for the budget market. These include Cyrix's Cx486SLC, and AMD's AM486SX. A 66MHz version of the latter, the Am486SX2-66, was released in 1994, a year after Intel had released its first Pentium processor.



          In order to compete with the Pentium range, third-party manufacturers effectively had to include an on-board FPU, so there were no "586" chips without floating-point instructions.



          I expect that the last manufactured x86 CPU that lacked floating-point instructions will have been an embedded chip such as the 80486GX.





          * for further reading, see the Pentium FDIV bug






          share|improve this answer
























          • Yes, there are 586-class CPUs with no FPU.

            – Stephen Kitt
            29 mins ago



















          2














          As far as I’m aware, the last FPU-less x86-compatible CPU is the Vortex86SX, released in 2007 and still available now. This is a Pentium-class CPU, capable of running any Pentium code which doesn’t require an FPU.






          share|improve this answer


























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            2 Answers
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            active

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            2 Answers
            2






            active

            oldest

            votes









            active

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            active

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            votes









            2














            All Intel x86 CPUs since the 80486 line have included floating point instructions, i.e. everything from the Pentium* onwards. So the last Intel processor to lack an on-board floating-point unit (FPU) was the 80486SX (and the embedded 80486GX).



            Other manufacturers, who made 486-compatible processors, continued making non-FPU chips, aiming for the budget market. These include Cyrix's Cx486SLC, and AMD's AM486SX. A 66MHz version of the latter, the Am486SX2-66, was released in 1994, a year after Intel had released its first Pentium processor.



            In order to compete with the Pentium range, third-party manufacturers effectively had to include an on-board FPU, so there were no "586" chips without floating-point instructions.



            I expect that the last manufactured x86 CPU that lacked floating-point instructions will have been an embedded chip such as the 80486GX.





            * for further reading, see the Pentium FDIV bug






            share|improve this answer
























            • Yes, there are 586-class CPUs with no FPU.

              – Stephen Kitt
              29 mins ago
















            2














            All Intel x86 CPUs since the 80486 line have included floating point instructions, i.e. everything from the Pentium* onwards. So the last Intel processor to lack an on-board floating-point unit (FPU) was the 80486SX (and the embedded 80486GX).



            Other manufacturers, who made 486-compatible processors, continued making non-FPU chips, aiming for the budget market. These include Cyrix's Cx486SLC, and AMD's AM486SX. A 66MHz version of the latter, the Am486SX2-66, was released in 1994, a year after Intel had released its first Pentium processor.



            In order to compete with the Pentium range, third-party manufacturers effectively had to include an on-board FPU, so there were no "586" chips without floating-point instructions.



            I expect that the last manufactured x86 CPU that lacked floating-point instructions will have been an embedded chip such as the 80486GX.





            * for further reading, see the Pentium FDIV bug






            share|improve this answer
























            • Yes, there are 586-class CPUs with no FPU.

              – Stephen Kitt
              29 mins ago














            2












            2








            2







            All Intel x86 CPUs since the 80486 line have included floating point instructions, i.e. everything from the Pentium* onwards. So the last Intel processor to lack an on-board floating-point unit (FPU) was the 80486SX (and the embedded 80486GX).



            Other manufacturers, who made 486-compatible processors, continued making non-FPU chips, aiming for the budget market. These include Cyrix's Cx486SLC, and AMD's AM486SX. A 66MHz version of the latter, the Am486SX2-66, was released in 1994, a year after Intel had released its first Pentium processor.



            In order to compete with the Pentium range, third-party manufacturers effectively had to include an on-board FPU, so there were no "586" chips without floating-point instructions.



            I expect that the last manufactured x86 CPU that lacked floating-point instructions will have been an embedded chip such as the 80486GX.





            * for further reading, see the Pentium FDIV bug






            share|improve this answer













            All Intel x86 CPUs since the 80486 line have included floating point instructions, i.e. everything from the Pentium* onwards. So the last Intel processor to lack an on-board floating-point unit (FPU) was the 80486SX (and the embedded 80486GX).



            Other manufacturers, who made 486-compatible processors, continued making non-FPU chips, aiming for the budget market. These include Cyrix's Cx486SLC, and AMD's AM486SX. A 66MHz version of the latter, the Am486SX2-66, was released in 1994, a year after Intel had released its first Pentium processor.



            In order to compete with the Pentium range, third-party manufacturers effectively had to include an on-board FPU, so there were no "586" chips without floating-point instructions.



            I expect that the last manufactured x86 CPU that lacked floating-point instructions will have been an embedded chip such as the 80486GX.





            * for further reading, see the Pentium FDIV bug







            share|improve this answer












            share|improve this answer



            share|improve this answer










            answered 1 hour ago









            KazKaz

            2,456942




            2,456942













            • Yes, there are 586-class CPUs with no FPU.

              – Stephen Kitt
              29 mins ago



















            • Yes, there are 586-class CPUs with no FPU.

              – Stephen Kitt
              29 mins ago

















            Yes, there are 586-class CPUs with no FPU.

            – Stephen Kitt
            29 mins ago





            Yes, there are 586-class CPUs with no FPU.

            – Stephen Kitt
            29 mins ago











            2














            As far as I’m aware, the last FPU-less x86-compatible CPU is the Vortex86SX, released in 2007 and still available now. This is a Pentium-class CPU, capable of running any Pentium code which doesn’t require an FPU.






            share|improve this answer






























              2














              As far as I’m aware, the last FPU-less x86-compatible CPU is the Vortex86SX, released in 2007 and still available now. This is a Pentium-class CPU, capable of running any Pentium code which doesn’t require an FPU.






              share|improve this answer




























                2












                2








                2







                As far as I’m aware, the last FPU-less x86-compatible CPU is the Vortex86SX, released in 2007 and still available now. This is a Pentium-class CPU, capable of running any Pentium code which doesn’t require an FPU.






                share|improve this answer















                As far as I’m aware, the last FPU-less x86-compatible CPU is the Vortex86SX, released in 2007 and still available now. This is a Pentium-class CPU, capable of running any Pentium code which doesn’t require an FPU.







                share|improve this answer














                share|improve this answer



                share|improve this answer








                edited 43 mins ago

























                answered 57 mins ago









                Stephen KittStephen Kitt

                40k8163173




                40k8163173






















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