From bpopov@mit.edu Thu Oct 13 12:32:56 1994
Path: ashpoly!cascade!bigsur!mit!bpopov
From: bpopov@mit.edu (Bruno Popov)
Newsgroups: comp.sys.m68k
Subject: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1994Oct13.123256.5287@mit.edu>
Date: Thu, 13 Oct 1994 12:32:56 GMT
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Can a 1989 Mac IIci decode a 40-minute LP in reasonable time?

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

Make sure you install the 32-bit Enabler on older IIci machines running System 7.1!

-- 
Bruno Popov
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From dreyes@demon.co.uk Sat Oct 15 13:06:56 1994
Path: ashpoly!cascade!mxgate!coyoacan!demon!dreyes
From: dreyes@demon.co.uk (Dong-hyun Reyes)
Newsgroups: comp.sys.m68k
Subject: Re: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1994Oct15.130656.5060@demon.co.uk>
Date: Sat, 15 Oct 1994 13:06:56 GMT
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In article <1994Oct13.123256.5287@mit.edu>, bpopov@mit.edu (Bruno Popov) writes:
> Can a 1989 Mac IIci decode a 40-minute LP in reasonable time?
> Total execution time for a 20-minute audio track dropped from 48 minutes to 6.2 minutes.

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

-- 
Dong-hyun Reyes
Tape trading list upon request. SASE required for international mail.

From jperez@netcom.com Sat Oct 15 18:58:56 1994
Path: ashpoly!cascade!transat!eunet-fr!teletel!netcom!jperez
From: jperez@netcom.com (Joachim Pérez)
Newsgroups: comp.sys.m68k
Subject: Re: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1994Oct15.185856.7339@netcom.com>
Date: Sat, 15 Oct 1994 18:58:56 GMT
References: <1994Oct13.123256.5287@mit.edu> <1994Oct15.130656.5060@demon.co.uk>
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In article <1994Oct15.130656.5060@demon.co.uk>, dreyes@demon.co.uk (Dong-hyun Reyes) writes:
> The 68040 on the Quadra is a monster -- the on-chip FPU executes FFT butterflies in less than 4 milliseconds.

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

-- 
Joachim Pérez | jperez@netcom.com
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