What was the last CPU that did not have the x87 floating-point unit built in? The 2019 Stack...
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What was the last CPU that did not have the x87 floating-point unit built in?
The 2019 Stack Overflow Developer Survey Results Are InWere there 8086 coprocessors other than the 8087?What was the first CPU with exposed pipeline?What's the relationship between early 90s Pentium microprocessor and today's Intel designs?Is there any reason to chose ES, FS, or GS over the others in real mode?How do you put a 286 in Protected Mode?Why not use fractions instead of floating point?Which pre-IEEE computers had a single precision FPU and implemented double precision floats in software?How did the 8086 interface with the 8087 FPU coprocessor?How did people program for Consoles with multiple CPUs?What can an 8086 CPU do if an x87 floating-point coprocessor is attached to it?
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
edited 1 hour ago
manassehkatz
3,132625
asked 2 hours ago
user12280user12280
232
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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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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
edited 1 hour ago
manassehkatz
3,132625
asked 2 hours ago
user12280user12280
232
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.
add a comment |
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
edited 1 hour ago
manassehkatz
3,132625
asked 2 hours ago
user12280user12280
232
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
history intel floating-point cpu x86
edited 1 hour ago
manassehkatz
3,132625
asked 2 hours ago
user12280user12280
232
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.
edited 1 hour ago
manassehkatz
3,132625
asked 2 hours ago
user12280user12280
232
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.
edited 1 hour ago
manassehkatz
3,132625
edited 1 hour ago
manassehkatz
3,132625
edited 1 hour ago
manassehkatz
3,132625
3,132625
asked 2 hours ago
user12280user12280
232
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.
asked 2 hours ago
user12280user12280
232
asked 2 hours ago
user12280user12280
232
232
New contributor
user12280 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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New contributor
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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
answered 1 hour ago
KazKaz
2,456942
Yes, there are 586-class CPUs with no FPU.
– Stephen Kitt
28 mins ago
add a comment |
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.
answered 56 mins ago
Stephen KittStephen Kitt
40k8163173
add a comment |
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2 Answers
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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
answered 1 hour ago
KazKaz
2,456942
Yes, there are 586-class CPUs with no FPU.
– Stephen Kitt
28 mins ago
add a comment |
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
answered 1 hour ago
KazKaz
2,456942
Yes, there are 586-class CPUs with no FPU.
– Stephen Kitt
28 mins ago
add a comment |
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
answered 1 hour ago
KazKaz
2,456942
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
answered 1 hour ago
KazKaz
2,456942
answered 1 hour ago
KazKaz
2,456942
answered 1 hour ago
KazKaz
2,456942
answered 1 hour ago
KazKaz
2,456942
2,456942
Yes, there are 586-class CPUs with no FPU.
– Stephen Kitt
28 mins ago
add a comment |
Yes, there are 586-class CPUs with no FPU.
– Stephen Kitt
28 mins ago
Yes, there are 586-class CPUs with no FPU.
– Stephen Kitt
28 mins ago
Yes, there are 586-class CPUs with no FPU.
– Stephen Kitt
28 mins ago
add a comment |
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.
answered 56 mins ago
Stephen KittStephen Kitt
40k8163173
add a comment |
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.
answered 56 mins ago
Stephen KittStephen Kitt
40k8163173
add a comment |
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.
answered 56 mins ago
Stephen KittStephen Kitt
40k8163173
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.
answered 56 mins ago
Stephen KittStephen Kitt
40k8163173
edited 42 mins ago
answered 56 mins ago
Stephen KittStephen Kitt
40k8163173
answered 56 mins ago
Stephen KittStephen Kitt
40k8163173
answered 56 mins ago
Stephen KittStephen Kitt
40k8163173
40k8163173
add a comment |
add a comment |
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