| Author |
Message |
friend.05@gmail.com
Guest
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 Posted:
Wed Oct 19, 2005 9:19 pm Post subject:
Data transfer Rate? |
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Hi,
How can I compare data transfer rate of 80286, 80386 and 80486 when
each processor is driven at same clock speed. ( e.g 16 Mhz). |
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Del Cecchi
Guest
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| Posted:
Wed Oct 19, 2005 9:43 pm Post subject:
Re: Data transfer Rate? |
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friend.05@gmail.com wrote:
| Quote: | Hi,
How can I compare data transfer rate of 80286, 80386 and 80486 when
each processor is driven at same clock speed. ( e.g 16 Mhz).
Hook up a logic analyser to each bus and measure it. |
--
Del Cecchi
"This post is my own and doesn’t necessarily represent IBM’s positions,
strategies or opinions.” |
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friend.05@gmail.com
Guest
|
| Posted:
Wed Oct 19, 2005 9:51 pm Post subject:
Re: Data transfer Rate? |
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i also want check theoritical value. can u tell me the formula to
calculate data transfer rate at 16 Mhz for 80286, 80386 and 80486 |
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Terje Mathisen
Guest
|
| Posted:
Wed Oct 19, 2005 11:30 pm Post subject:
Re: Data transfer Rate? |
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friend.05@gmail.com wrote:
| Quote: | Hi,
How can I compare data transfer rate of 80286, 80386 and 80486 when
each processor is driven at same clock speed. ( e.g 16 Mhz).
|
Easy:
First you build three otherwise identical machines (same RAM speed etc),
then you write optimized memcpy() code for each version, measure the
actual speed and then fianlly compare.
Like I said, easy!
Terje
--
- <Terje.Mathisen@hda.hydro.com>
"almost all programming can be viewed as an exercise in caching" |
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JJ
Guest
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| Posted:
Wed Oct 19, 2005 11:42 pm Post subject:
Re: Data transfer Rate? |
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friend.05@gmail.com wrote:
| Quote: | i also want check theoritical value. can u tell me the formula to
calculate data transfer rate at 16 Mhz for 80286, 80386 and 80486
|
Or you could find some really old C/asm x86 programmers books that
showed optimized coding techniques for various x86 as they came along.
Mine only go back to 386 or so.
Look for Michael Abrash and similar authors, they cranked out faster
memcpy all the time tuned for each processor..
John |
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Jason Ozolins
Guest
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| Posted:
Thu Oct 20, 2005 12:15 am Post subject:
Re: Data transfer Rate? |
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Del Cecchi wrote:
| Quote: | Terje Mathisen wrote:
friend.05@gmail.com wrote:
Hi,
How can I compare data transfer rate of 80286, 80386 and 80486 when
each processor is driven at same clock speed. ( e.g 16 Mhz).
Easy:
First you build three otherwise identical machines (same RAM speed etc),
then you write optimized memcpy() code for each version, measure the
actual speed and then fianlly compare.
Like I said, easy!
Terje
can you buy 286 chips on ebay? And did they make 16 MHz 80286 parts?
|
Back in the day, AMD and Harris made fast 286s which (at least in Australia)
were strong competitors with the 386SX for the value desktop niche, much to
Intel's annoyance I imagine. Fastest 286 I remember was 20MHz (stock speed,
not overclocked).
-Jason |
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MSCHAEF.COM
Guest
|
| Posted:
Thu Oct 20, 2005 12:15 am Post subject:
Re: Data transfer Rate? |
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In article <4356cacb$1@clarion.carno.net.au>,
Jason Ozolins <jason_abroad@yahoo.com.au> wrote:
...
| Quote: | Back in the day, AMD and Harris made fast 286s which (at least in Australia)
were strong competitors with the 386SX for the value desktop niche, much to
Intel's annoyance I imagine. Fastest 286 I remember was 20MHz (stock speed,
not overclocked).
|
Yeah, Dell made one, the System 220:
http://support.dell.com/support/edocs/dta/220/00000001.htm
IIRC, 286/20's were faster and cheaper than 386sx/16's, but lacked
the 386-specific CPU modes (obviously). There were cached 386sx/20
machines that more than made up the difference.
At the time I was a 386sx partisan, but in retrospect the advantages were
pretty slim for a DOS/Windows workload.
-Mike
--
http://www.mschaef.com |
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Del Cecchi
Guest
|
| Posted:
Thu Oct 20, 2005 12:15 am Post subject:
Re: Data transfer Rate? |
|
|
Terje Mathisen wrote:
| Quote: | friend.05@gmail.com wrote:
Hi,
How can I compare data transfer rate of 80286, 80386 and 80486 when
each processor is driven at same clock speed. ( e.g 16 Mhz).
Easy:
First you build three otherwise identical machines (same RAM speed etc),
then you write optimized memcpy() code for each version, measure the
actual speed and then fianlly compare.
Like I said, easy!
Terje
can you buy 286 chips on ebay? And did they make 16 MHz 80286 parts? |
--
Del Cecchi
"This post is my own and doesn’t necessarily represent IBM’s positions,
strategies or opinions.” |
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Bill Bradley
Guest
|
| Posted:
Thu Oct 20, 2005 7:45 am Post subject:
Re: Data transfer Rate? |
|
|
Del Cecchi wrote:
| Quote: | Terje Mathisen wrote:
friend.05@gmail.com wrote:
Hi,
How can I compare data transfer rate of 80286, 80386 and 80486 when
each processor is driven at same clock speed. ( e.g 16 Mhz).
Easy:
First you build three otherwise identical machines (same RAM speed etc),
then you write optimized memcpy() code for each version, measure the
actual speed and then fianlly compare.
Like I said, easy!
Terje
can you buy 286 chips on ebay? And did they make 16 MHz 80286 parts?
|
Sure, Harris even made a 20Mhz...got one sitting around here in one of
my old machines. Was significantly faster than a 25 or 33Mhz 386SX in
real world apps.
Bill |
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Terje Mathisen
Guest
|
| Posted:
Thu Oct 20, 2005 8:15 am Post subject:
Re: Data transfer Rate? |
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Del Cecchi wrote:
| Quote: | Terje Mathisen wrote:
First you build three otherwise identical machines (same RAM speed etc),
then you write optimized memcpy() code for each version, measure the
actual speed and then fianlly compare.
Like I said, easy!
Terje
can you buy 286 chips on ebay?
|
Probably. :-)
| Quote: | And did they make 16 MHz 80286 parts?
|
Good question! Intel never did, but at least one competitor (AMD?
Harris?) did.
Terje
--
- <Terje.Mathisen@hda.hydro.com>
"almost all programming can be viewed as an exercise in caching" |
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