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From: chris@tadhg.newcastle.ac.uk (Chris Forker - Nav Arch-)
Newsgroups: comp.sys.atari.st
Subject: Re: adding a 68881
Message-ID: <1989Sep14.084139.17332@newcastle.ac.uk>
Date: 14 Sep 89 08:41:39 GMT
References: <8909131852.a027631@nabla.electrical-engineering.umist.ac.uk>
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I have a board with a 68881 produced by Atari in my Mega. 

You did not state what machine you have. I got my board from Silica
Shop about a year ago for 107 pounds sterling ( ed discount ).

If you don't have a Mega, you could consider one of the accelerator
boards with a slot to take the 68881.

Try Power Computing, or Third Coast Tech.

BTW, Pro. Fortran with the 68881 flies. Not much slower on the savage 
benchmark than a Sun 3/50. 

The following benchmarks where obtanined using Pro. Pascal.

TEST		Fib		Float		Sieve		Savage
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
No. Iter.       100             10,000           100            25,000
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Atari ST      303.93            52.06            57.23          518.60
Atari ST (1)  303.93            12.42            57.23            6.37
Mac SE        264.00           229.98            64.70         1884.30
Sun 3/50 *     88               17               10             254
Sun 3/50 (2)  135                2               10               5
Sun 3/60 *     57               11                7             161
Sun 3/60 (3)   94                2                7               4
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Sun 386i +    125               14               27             179
Sun 386i (4)  124                1               27              16
IBM PS/2 50 + 258               28               60             365
IBM PS/2 70 + 140               16               29             200
IBM ATx +     324               35               74             458
IBM ATx (5)   317               11               75              31
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
		( ALL times are in seconds )


*:Sun Unix Release 3.5 ( Pascal -no optimization, multi-user, & fsoft)
1:MC68000 @ 8Mhz + MC68881 @ 16Mhz
2:MC68020 @ 15.5Mhz + MC68881 @ 15.5Mhz
3:MC68020 @ 20Mhz + MC68881 @ 20Mhz

2 & 3 used the -f68881 option instead of -fsoft.

+:No maths co-processor
4:80387 @ 16Mhz  ( I think. The 386i is the 150 variant )
5:80287 @ 10Mhz

All times obtained using the DOS version of Pro. Pascal on IBM's & Sun 386i.
386i was in DOS mode.

The time for the Mac SE was found in the July 87 ( I think ) issue of
BYTE in an article on benchmarking machines.

The same Pascal code was used on all the machines. Although different 
timing methods were employed in software for each different
architecture.

The above figures are given in good faith. As with all benchmarks you
only get what you want to see.

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