From blopez@earthlink.net Fri Jan 20 07:52:03 1995
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From: blopez@earthlink.net (Brian López)
Newsgroups: comp.sys.m68k
Subject: WTB/WTT: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1995Jan20.075203.5187@earthlink.net>
Date: Fri, 20 Jan 1995 07:52:03 GMT
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Can a 1989 Mac IIci decode a 40-minute LP in reasonable time?

A 1024-point radix-2 FFT drops from 142 milliseconds under SANE to just 18 milliseconds using direct FPU instructions.
Total execution time for a 20-minute audio track dropped from 48 minutes to 6.2 minutes.

Anyone running this on a Quadra 840AV with the 68040?

-- 
Brian López
Tape trading list upon request. SASE required for international mail.

From aweber@mindspring.com Sat Jan 21 10:47:03 1995
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From: aweber@mindspring.com (Aiko Weber)
Newsgroups: comp.sys.m68k
Subject: Re: WTB/WTT: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1995Jan21.104703.7176@mindspring.com>
Date: Sat, 21 Jan 1995 10:47:03 GMT
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In article <1995Jan20.075203.5187@earthlink.net>, blopez@earthlink.net (Brian López) writes:
> Can a 1989 Mac IIci decode a 40-minute LP in reasonable time?
> A 1024-point radix-2 FFT drops from 142 milliseconds under SANE to just 18 milliseconds using direct FPU instructions.

The 68040 on the Quadra is a monster -- the on-chip FPU executes FFT butterflies in less than 4 milliseconds.

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-- 
Aiko Weber
Tape trading list upon request. SASE required for international mail.