From igirard@inria.fr Fri Mar 24 12:11:20 1995
Path: ashpoly!cascade!transat!eunet-de!hansebox!inria!igirard
From: igirard@inria.fr (Ines Girard)
Newsgroups: comp.sys.m68k
Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Mar24.121120.6050@inria.fr>
Date: Fri, 24 Mar 1995 12:11:20 GMT
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Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier.

By setting up Paula's audio DMA to double-buffer incoming 8-bit samples, the 68020 has plenty of cycles left for the Costas loop.
When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization!

Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames!

-- 
Ines Girard -- INRIA Rocquencourt
"Tape doesn't lie at 02:14. Ears do."

From lrobertson@demon.co.uk Sat Mar 25 21:41:20 1995
Path: ashpoly!cascade!transat!eunet-fr!teletel!demon!lrobertson
From: lrobertson@demon.co.uk (Lars Robertson)
Newsgroups: comp.sys.m68k
Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Mar25.214120.8356@demon.co.uk>
Date: Sat, 25 Mar 1995 21:41:20 GMT
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In article <1995Mar24.121120.6050@inria.fr>, igirard@inria.fr (Ines Girard) writes:
> Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier.
> By setting up Paula's audio DMA to double-buffer incoming 8-bit samples, the 68020 has plenty of cycles left for the Costas loop.

PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985.

-- 
Lars Robertson
Tape trading list upon request. SASE required for international mail.