80x87 chip speeds

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2 total messages Started by A. David Havill Wed, 08 May 1991 18:42

#1192

Author: A. David Havill
Date: Wed, 08 May 1991 18:42

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I use a 80386 (not an SX) paired with a 387 math chip. The 386 runs at 20Mhz.
There is an option on my motherboad that allows one to use either a 16Mhz or
20Mhz math chip with the removal or insertion of a jumper.

The problem is that I can't really confirm whether the 387 is working at 16Mhz
or if it's operating at 20 Mhz, which is what it's rated for.

My question is this-- are there any programs or subroutines which rate the
speed of a math chip? (preferably in ratios to existing math chips-- a ratio
compared to a 16Mhz 387 would be great) Many programs exist on the market to
test PC relative speeds and MIP ratings... but I can't find anything for 87s.

While program code is nice, I'd appreciate any tips I can get as to how I
can tell if it's running up to speed. Yeah, I know I could check the manual to
see how the jumper is set-- but my manual has been wrong before when it came
to jumper settings. My system is an ALR 386/220.
-- 
+--------------------------------------------------+      Adrian "David" Havill
| "I have no meaningful quotes." -- me.            | dhavill@rucs2-gw.runet.edu
+--------------------------------------------------+   my opinions are not RU's

Re: 80x87 chip speeds

#1195

Author: Bob Gettys
Date: Thu, 09 May 1991 12:57

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	One of the benchmarks in Checkit (a commercial program) tells you what the speed is
of your math processing - 80x87 or not. It reports in Whetstones so telling the speed is not
easy, but it would allow you to set it for the faster one.

	/s/	Bob Gettys

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